The hormone testosterone is vital for both men and women, though it is more important for men because it plays a bigger role in the male body and is present at higher levels.

Over the last 10 years, multiple studies have begun to show that diet, and a number of vitamins and minerals play a huge role in it’s production, which has led to a rise in supplements known as testosterone boosters hitting the market. Very few have had complete trials done although Center TRT are looking to run some double blind trials on their list of preferred testosterone boosters later this year, we may update our list pending the results.

Testosterone levels contribute to a number of essential bodily functions. Some of the key areas where testosterone plays a crucial role are sexual health and functioning, fertility, muscle growth, and metabolic rate.

Low testosterone issues are increasingly common among men and can have serious health implications. Among other problems, low testosterone can cause:

-  an increase in fat retention

-  the loss of body hair

-  a loss of strength and endurance

-  a low sex drive

To avoid a lot of the problems caused by poor diet, zinc and vitamin D deficiencies for example, a testosterone booster supplement can be used to increase testosterone levels.

A testosterone booster, also known as a testosterone supplement or a test booster, is a natural or artificial substance that increases testosterone levels in the body.

The best test boosters usually contain a combination of natural extracts known for their testosterone boosting qualities. Although with a lot of low quality supplements on the market, finding the best testosterone booster for you’re needs can be a challenge.

Testosterone boosters can be a great way for people suffering from low testosterone to improve their health and quality of life.

Many people who try test boosters report a dramatic increase in energy levels, and, what’s more, increased testosterone is known to improve mental wellbeing and reduce depression [1].

As well as alleviating the symptoms caused by low testosterone, a test booster can actively increase or improve muscle development, sex drive, energy levels, bone density, metabolic rate, and all-around motivation. You may also find that you start to feel younger and fresher when you use a test booster.

If you are an athlete or fitness enthusiasts, using a testosterone booster can help you to take your training to the next level and achieve the results you want.

It’s also becoming increasingly popular in younger men, so the market has branched out from simply making testosterone boosters for men over 40, and started to make a lot more supplements aimed at younger men as a way to slow their declining T levels rather than purely being designed to boost testosterone levels.

With so many test boosters on the market, it can be difficult to choose the one best for you. What’s more, there are some dubious boosters that you will want to avoid altogether.

Below is a review of the best testosterone boosters available. These are safe test boosters that have been proven to increase testosterone levels naturally and help ordinary people of various ages to gain muscle, lose weight, and improve their overall fitness and mood.

The top nine testosterone boosters available, starting with the best and working down, are Testofuel, Hunter Test, Prime Male, Prime Enhance, Testogen, Weider Prime, Testofierce, T-Boost, and T-Drive. Let’s take a look at each one in detail.

Prime Male: Best Testosterone Boosters Overall

TestoFuel: Best Testosterone Boosters For Gym

Hunter Test: Highest Dosage Testosterone Booster/Best Premium

Prime Enhance: Best Testosterone Booster For Libido

Weider Prime: If You’re On A Tight Budget

Prime Male offers a “whole new reality of testosterone-enriched vitality” and delivers on that promise. It takes our best all around spot, and it’s the best testosterone booster for men over 50. Honestly, we could’ve given Prime Male half the awards on this list.

Aimed at men aged 30 and over, Prime Male is designed to increase quality of life, happiness, libido, and fitness performance by boosting testosterone in a natural way.

Customer reviews are overwhelmingly positive and enthusiastic among all ages, but especially among older men, including those over 50. They focus on the increased strength, improved libido, quickened rate of fat loss, and mood improvements they experienced after starting to take Prime Male. In short, Prime Male makes you feel young and vital once more.

The Prime Male formula features 12 quality ingredients that boost testosterone and improve health in a variety of ways. The company describes their ingredients mix as the “anti-aging Dirty Dozen”.

These are the 12 ingredients in Prime Male: D-Aspartic acid, black pepper, boron, Korean ginseng, luteolin, magnesium, ashwagandha extract, nettle root, vitamin B6, vitamin D3, vitamin K2, and zinc. With the vitamin blend covering the deficiencies which most harm testosterone levels as well as being common enough to effect nearly half of adult men in the USA. And with D-Aspartic acid being the most effective ingredient beyond that (which is highly dosed in Prime Male) they focus on the ingredients that are proven to work which is what makes them the best testosterone booster. Nothing that doesn’t work, everything is correctly dosed, and honestly the only thing we’d even consider changing is potentially swapping the nettle root for maca, but it’s such a small difference and nothing else comes close so it doesn’t even really seem worth mentioning.

For 905 of men, Prime Male is the best test booster on the market. It has been specifically designed to suit the needs of men at any stage of their life, but chiefly those aged 30 and over who require that extra boost to be at their best if you’re looking for a natural testosterone booster, get Prime Male.

How it Works: Take one capsule with a meal or snack four times per day. Use consistently for best results.

Unique formula focused on men’s needs

100% natural, testosterone boosting ingredients produced in GMP certified environment.

Only available from manufacturer site

Carefully researched and containing almost all the best testosterone enhancing ingredients (along with a few bonus ingredients for that extra boost when it comes to working out), Testofuel is the most effective muscle focused test booster on the market today. It makes a really good all rounder as well mind, so it’s not just for gym rats.

Add into the bargain Testofuel’s reasonable price - especially considering its quality - and it’s clear Testofuel is arguably the best test booster available period, it only loses it’s spot to Prime Male by a hairs breadth.

Suitable for all ages and sexes, Testofuel is ideal for anyone looking to boost their testosterone levels in order to improve their physical performance and appearance.

Testofuel features nine of the best testosterone boosting ingredients delivered at expertly balanced doses. The ingredients in Testofuel are D-Aspartic acid, vitamin D, oyster extract, ginseng, fenugreek, magnesium, vitamin B6, vitamin K2, and zinc.

Created and manufactured by industry leader Roar Ambition, Testofuel is a high-end, top quality test booster that comes at an affordable price.

The manufacturer is cGMP-certified ensuring a clean production environment and guaranteeing a quality end product. In other words, you get what you pay for when purchase Testofuel.

How it Works: A single bottle of Testofuel contains 120 capsules, which is enough for one month. You are advised to take four capsules per day, one with breakfast, one with a snack, one with lunch, and one with dinner.

Proven results include fast muscle growth, increased energy, real strength, increased metabolism, and heightened libido.

Exceptional reviews from users & athlete endorsed

Contains the best natural ingredients for test boosting

Supports growth and repair of muscle tissue.

Only available from Testofuel.com

Only good value as a multibuy (although generally test boosters are ongoing usage, so less of an issue)

Boasting higher doses of premium ingredients than any other test booster, Hunter Test is the best premium booster that money can buy.

Perfect for boosting testosterone and improving performance, Hunter Test is about reigniting your drive and motivation.

The ingredients are carefully tuned by scientists to achieve three goals: amplify muscle growth, ignite energy, and achieve powerful performance.

Using this test booster will build muscle, improve your sexual functioning, give you a persistent energy boost, and ensure you are always at the top of your game.

The Hunter Test ingredients mix includes common test boosters combined with powerful rarities that most boosters won’t include. The full ingredients are as follows: D-aspartic acid, vitamin K2, a high dose of vitamin D, Asian ginseng, ashwagandha (traditionally known to make one as “strong as a horse”), zinc, magnesium, indole-3-carbinol, and boron chelate.

The last two ingredients, indole-3-carbinol (I3C) and boron chelate, are known to block oestrogen production and boost testosterone respectively.

Hunter Test is by the far the best premium testosterone booster available. It offers high-end performance gains through the use of natural, powerful ingredients.

How it Works: Each package of Hunter Test includes 180 capsules. Testing has shown that taking six capsules per day produces the best results.

An unbeatable formula containing high doses of premium ingredients

Scientifically proven to boost testosterone

GMP certified and free from gluten, soy, GMOs, artificial colours, flavours, and preservatives

Considering Prime’s Vitality blend topped our list, it shouldn’t be a huge surprise that their dedicated libido enhancer also make the running, whilst still functioning as a testosterone booster, it has a heavy leaning towards other ingredients that increase blood flow and sperm quality. The best libido-focused test booster available. It includes a variety of ingredients focused on enhancing the male sex drive, including horny goat weed, damiana leaf, tribulus terrestris, muira puama and ginseng. More familiar ingredients include L-arginine and zinc.

Prime’s Enhance test boost is also quite well suited to overall mood improvement and could in theory function reasonably well as a nootropic. Not a normal testosterone boosting supplement by any means, it’s sort of a hybrid between that and a male enhancement pill. But, either way it will help boost testosterone production.

How it Works: Each bottle of Prime contains 120 capsules to be consumed as two pills twice a day.

Not an all-rounder: focused on libido

 Check Deals On Prime Male Enhance

Weider Prime doesn’t pack the same punch as the previous four test boosters, but it does cover off the vitamin bases, although it under dosses ashwaganda, that the more effective boosters have get right.

DIM is an interesting in theory it should help increase free testosterone levels, by binding to luteinizing hormones[2]. If you are looking for either of these in particular, then Weider is the product for you.

Besides its unusual ingredients, Weider is a generally well-balanced, effective test booster. It is also the best budget test booster option available. We’d just prefer to have higher dosages, but it is what you would expect from a cheaper testosterone booster.

However, customers generally report irritation at the time it takes to see results. If you’re looking for a test booster that offers all-round results in record time, then return to the top of this list and give Prime Male a try.

How it Works: Take one capsule three times per day, with or without food.

Some reports of customer dissatisfaction

Created by Trufierce, the Testofierce booster enhances muscle growth, boosts metabolism, heightens sex drive, and improves energy levels.

Customers tend to report feeling more positive after taking Testofierce, though customer feedback in other areas, such as muscle growth, is less conclusive.

The Testofierce formula is well-rounded and includes potent testosterone boosting components that suggest solid results.

The ingredients included in Testofierce are ashwagandha root extract, vitamin D3, D-aspartic acid, fenugreek seed extract, magnesium, zinc, ginseng powder, boron, vitamin K, vitamin B6, and black pepper fruit extract.

The formula is powerful, but again, falls short of more established test boosters such as Testofuel and Prime Male that have more functional dosages and scientifically prepped ingredient mixes.

How it Works: A monthly supply of Testofierce is 210 capsules. Take seven capsules per day for best results.

Customers tend to feel better

New to the market - Not tried and tested

With numerous positive reviews from satisfied customers, Testogen makes it to number four on this list. Testogen didn’t make it onto the podium because its formula lacks the same level of sophistication on display in Testofuel, Hunt Test, and Prime Male. For example, it includes vitamin K1, rather than K2, which, as mentioned, has not been proven to increase testosterone.

That said, Testogen is a popular product that can help boost testosterone and improve physical performance. Testogen increases free testosterone levels and slows the conversion of testosterone into oestrogen which results in more energy and improved training results.

The most unique aspect of Testogen is that it also comes in drop form: the Testogen Instant Booster Drops. The drops offer fast energy and testosterone-enhancing ingredients delivered directly to your bloodstream.

The Testogen Instant Booster Drops are designed to work together with the Testogen slow-release capsules. The drops should be taken three times daily for maximum testosterone boosting effectiveness. That said we’re not a fan of this as natural testosterone boosters go, in theory, this can work to immediately boost t levels, but so does working out itself, you’d likely get far more impact from a caffeine pill or any sort of pre workout, this isn’t really what testosterone booster supplements are for, so we think this is really gimmick to capitalise on most men’s desire to pack on lean muscle mass as a key factor in purchasing testosterone booster supplements.

Testogen’s formula, while not quite on par with the previous products explored, does include some powerful ingredients, such as magnesium, zinc, D-Aspartic acid, ginseng extract, and fenugreek extract. It is also manufactured in GMP-certified facilities.

How it Works: A single bottle of Testogen equals one month supply if taken at the manufacturer’s recommended dose of one capsule four times per day.

Comes in capsules and drops

Misses some of the best ingredients

Boosts energy levels, improves strength, and builds muscles

Expensive when brought in small quantities

T-Boost by Viaman is a gluten free and GMO free testosterone booster that is manufactured in the UK.

Viaman’s T-Boost focuses on boosting libido, increasing sperm count, and improving fertility by revitalising your body with a natural testosterone boost.

The ingredients in T-Boost include zinc, maca root, D-aspartic acid, magnesium, vitamin A, and fenugreek. In terms of dosage, the ingredient amounts are reasonably well balanced and reviewers report positive results.

Another benefit of the Viaman formula is an increase in oxygen uptake, which relaxes blood vessels and increases blood flow to important organs.

How it Works: Each bottle contains 180 capsules, which the manufacturer says is enough for three months. This puts T-Boost in the running for Best Budget Test Booster, since it is extremely good value for money. Its only drawback compared to the best budget option, Weider, is that it is too focused on sex drive and therefore not a good all-round test booster.

Not an all-rounder: focused on libido and sexual performance

Not ideal for weight loss

T-Drive, created by Inno Supps, is an established testosterone booster that intensifies the body’s natural testosterone production, leads to higher energy levels, and better performance at home and in the gym.

Containing many of the best ingredients for test boosting, T Drive is a decent all-round booster that will help you lose weight or gain muscle mass. It has also been shown to increase sperm count and mobility.

T-Drive contains several uncommon ingredients as test boosters go, including coleus forskohlii root extract, which has been shown to shed fat, boost testosterone, and increase bone mass [3].

Its mid-range price and reasonable performance make T Drive a good choice whether you are training regularly or simply looking to gain some extra energy at home.

How it Works: Inno Supps recommends taking three capsules each day, at any time, with or without food. A single bottle of T-Drive is enough for one month as it contains 90 test-boosting capsules, but the manufacturer advises taking T-Drive for at least three months to get the best results.

Suitable for vegetarians and vegans

More expensive than other all-rounders

Misses some of the best testosterone boosting ingredients, such as ginseng and vitamin K2.

You’ve probably heard of steroids, and you probably know how bad taking steroids is for your health if not prescribed by a doctor; well, most steroids are artificial ways of boosting testosterone. To avoid the pitfalls of taking steroids always use natural test boosters instead.

So when you ask yourself, “What is the best legal test booster?” The answer, invariably, is a natural test booster. This is because natural test boosters are safe test boosters. In other words, they do not produce unwanted or dangerous side effects.

Natural test boosters are made from ingredients that occur in nature. Most of these ingredients are sourced from plants, particularly from herbs and plant roots.

These natural plant extracts and powders are included in test boosters at quantities far higher than you could comfortably consume by eating the plant itself. In this concentrated form the testosterone boosting qualities of the plants can have powerful effects on the body.

In one way or another, each of the ingredients included in a natural test booster supports the body in the production of testosterone, supporting normal processes, rather than artificially enhancing or bypassing them.

There are four key factors to consider when deciding which testosterone booster is right for you and whether it’s worth the money. You’ll notice that these four factors were mentioned again and again in the review of the nine best test boosters above.

• Reviews: It’s always worth checking customer reviews to see whether other people have positive things to say about the results and the manufacturer’s customer service, but take reviews with a pinch of salt since customers with a bad experience are more likely to post a review than a satisfied one.

• Doses: Choose a supplement with adequate doses. Preferably look for a supplier that can prove the efficacy of the doses they prescribe.

• Quality: The fitness supplement industry is known for being somewhat dubious, so look for suppliers with a cGMP (current Good Manufacturing Practises) label, which is regulated by the American Food and Drug Administration (FDA). The equivalent label in the UK is simply GMP, which is monitored by a private company that adheres to the same standards at the FDA.

• Ingredients: The most important thing to consider when choosing a test booster is the ingredients included in the supplement. Look for supplements with scientifically researched ingredients and explore the characteristics of each ingredient to ensure it offers the benefits you are looking for. Some ingredients are more focused on muscle development, while others enhance libido and sexual performance. Below is a list of the best test booster ingredients to lookout for.

After examining the scientific research, the best test boosting ingredients and those that show the most promise of effectiveness have been narrowed down to the following 10: D-aspartic acid, dehydroepiandrosterone, oyster extract, vitamin D, ginseng, fenugreek, magnesium, zinc, L-arginine, and vitamin K2.

These ingredients are included in many of the nine best test boosters listed above, so let’s take a look at each one in more detail and find out exactly how they impact testosterone production.

One of the most commonly listed ingredients in test boosters today is D-aspartic acid. D-aspartic acid is a combined amino acid comprised of aspartic acid and L-aspartate. It functions in the central nervous system and the reproductive system.

D-aspartic acid has been shown to boost testosterone, reduce the likelihood of erectile dysfunction, and increase fertility [4]. Its broad and powerful benefits mean you will find it in most good testosterone supplements.

Dehydroepiandrosterone (DHEA) is a hormone produced in the body’s adrenal gland. Its job is to assist in the production of other hormones, including testosterone.

The body’s ability to create DHEA begins to decrease in early adulthood which is why this supplement can be particularly beneficial to middle-aged men and men over 50 looking to increase their testosterone levels.

As well as increasing testosterone, DHEA is associated with a wide range of other health benefits including increased physical and psychological wellbeing and improving muscle strength [5].

As it turns out, the age-old idea that oysters increase your virility has some truth to it. It’s probably not the magical aphrodisiac people once believed it to be, but oysters are rich in zinc, an essential component in the production of testosterone.

Adding zinc to your diet by consuming oysters or oyster extract gives your body the fuel it needs to increase testosterone production. This is why a good test booster will include a healthy dose of oyster extract, or at least some zinc.

Vitamin D, the sunshine vitamin, has countless good deeds to its name, so it shouldn’t come as much of a surprise to learn that yet another beneficial function of vitamin D is boosting testosterone.

If you’re lucky enough to spend a lot of time in the sun then perhaps your vitamin D levels are sufficient, but for those who find themselves living in cloudier climates, which includes the majority of the USA a supplement is recommended. As such vitamin D is included in most natural testosterone boosters.

A 2011 study of the effect of vitamin D supplements on testosterone levels in men discovered a significant increase in testosterone among those who regularly took vitamin D. These participants were compared with a control group who took a placebo. The control group showed no significant increase in testosterone levels. The study concluded that more research was needed to confirm the results but that it is highly likely vitamin D, taken regularly, can  increase testosterone levels significantly [6].

Another study, published in 2015, found that supplemental vitamin D increased strength performance over the course of a one to six-month trial period and caused no ill effects [7].

High levels of vitamin D are thought to be more effective. The better, most effective test boosters will contain around 3000 IU.

Derived from the root of plants in the Panax genus, ginseng has been used in traditional medicine for centuries and has been referred to as The King of all Herbs. While initially skeptical, modern science is beginning to recognise the various benefits of ginseng as a health supplement.

One study, conducted in 1996, showed Asian ginseng extract increased the amount of free testosterone in the 66 participants [8].

Free testosterone is testosterone that is not attached to any proteins; free testosterone is important for improving sleep quality, endurance, sexual functioning, and the production of red blood cells.

Another study, carried out on rats, demonstrated an increase in testosterone production as a result of ginseng, along with increased appetite without the expected weight gain [9].

When selecting a test booster with ginseng, look for one containing an Asian variety, such as Korean or Malaysian ginseng, as these have been shown to be effective while American ginseng has not.

This next testosterone boosting ingredient you may have come across while cooking as it is a common herb in some kitchens; that herb is fenugreek.

Fenugreek is native to the Mediterranean and parts of Asia and is associated with numerous health benefits. Fenugreek has been valued for its medicinal properties for millennia. The ancient Romans used it to treat pregnancy pains, while the Chinese used it to prevent swelling. Today, fenugreek is also sought-after for its ability to boost testosterone.

One study, conducted on 50 male participants aged between 35-65, recorded an incredible 46% increase in free testosterone levels among 90% of the participants [10].

Another study showed that fenugreek, in combination with resistance training, led to an increase in both free testosterone and bounded testosterone (testosterone that is connected to one or more proteins).

In fact, the study found that the fenugreek supplement increased testosterone in participants by an astonishing 98.7%. The study’s control group, which was given a placebo, increased testosterone levels by just 48.8% [11].

With such incredible results to back it up, this powerful herb should be high on your list of priorities when selecting a test booster.

Magnesium is an extremely important mineral that plays many roles in the functioning of the body. It supports the immune system, regulates blood pressure, is involved in muscle and nerve operation, and research suggests it also plays a role in testosterone production.

It is well known that magnesium deficiency can be a direct cause of low testosterone [12]. If this is the case, taking magnesium supplements can return testosterone to normal levels very rapidly.

Additionally, magnesium supplements appear to boost testosterone in people without a deficiency. A study comparing the impact of magnesium supplements given to athletes and to people considered sedentary found that both groups were able to boost testosterone naturally[13]. However, the boost gained by the athletes was greater, suggesting the importance of regular physical exercise in combination with supplement use for best results.

As mentioned, zinc is believed to be the mineral that gives oysters their testosterone-boosting abilities. Of course, you don’t need to eat oysters or oyster extract to consume zinc. Zinc is a widely available supplement in its own right and has been shown to have a positive impact on testosterone production.

A study conducted on football players during spring training season discovered a marked increase in free testosterone levels among players who received a zinc supplement [14].

As with magnesium, a zinc deficiency can also lead to very low levels of testosterone. A study carried out in 1996 demonstrated the connection between zinc and testosterone by depriving 40 healthy men of zinc and then measuring their testosterone levels. They discovered a sharp drop in testosterone in all participants [15].

Taken together, these studies suggest that zinc supplements, like magnesium, can boost testosterone in healthy bodies as well as those with deficiencies. So if you suffer from low testosterone or are simply looking for that extra boost, check for a testosterone supplement that includes zinc.

If you are looking for a test booster that increases your libido and sexual performance as well as muscle development then L-arginine can be a good ingredient to look for.

L-Arginine is an amino acid that is commonly used to treat heart disease and erectile dysfunction. This is because it facilitates blood flow by widening blood vessels.

Research into L-Arginine’s effect on testosterone levels is still in the early stages, however, some animal studies draw a link between resistance training, L-Arginines, and increased testosterone [16].

As with the minerals magnesium and zinc, vitamin K2 deficiency is linked to low testosterone issues [17]. It also happens to be vital for a healthy heart and strong bones, particularly in later life.

It’s important you find a test booster that contains vitamin K2, rather than vitamin K1, as a 2011 study suggests that of these two variants of vitamin K only vitamin K2 stimulates testosterone production and circulation [18].

For most men, natural testosterone production begins to decrease from the age of 30 by approximately 1% per year [https://www.healthline.com/health/low-testosterone/testosterone-levels-by-age]. If you are over 50, it is likely your testosterone levels are running low and this can have adverse effects on your quality of life. In particular, you are likely to find yourself more tired, less motivated, and perhaps more grumpy or depressed.

The best test boosters for over 50s are Prime Male and Hunter Test because both boosters contain a well-balanced mix of ingredients that focus on replenishing energy levels and stimulating vitality.

For best results, men over 50 should take test boosters in combination with light exercise and a healthy diet. It is also important to avoid stress and get enough sleep.

Test Boosters for Athletes and Fitness Enthusiasts

Since low testosterone decreases your strength and endurance, insufficient testosterone can impede your strength training development and prevent you from achieving your fitness goals.

Equally, having adequate levels of testosterone in your body will help you to build bigger and stronger muscles, lose body fat, and have more energy for training; with higher levels of testosterone, you are going to see better results faster.

As an athlete, bodybuilder, or fitness enthusiast of any level, adding a test booster to your diet regimen, whether you’re in your 20s or your 50s, will ensure you’re getting the most out of your exercise routine.

A Final Word About Testosterone Boosters

Maintaining a healthy level of testosterone in your body is essential for a healthy, vital life, and achieving your fitness goals, whatever your age.

Using a natural testosterone booster is scientifically proven to increase your testosterone level in a safe and healthy way without the danger of harmful side effects caused by artificial test boosters.

Choosing from the plethora of testosterone enhancing products available can be a challenge, but if you pay attention to the combination of the ingredients and make sure the ingredients most suited to your goals are included then you’ll be able to select a test booster that offers real benefits.

Whether you’re looking to increase your libido and sexual performance, pack on muscle mass and overcome a training plateau, or simply increase your daily energy levels, you want to make sure you get the best testosterone booster for your needs so it can help you reach your goal and improve your life while avoiding the pitfalls of low testosterone.

Although it should be noted that no matter what, diet and good testosterone boosting exercise routine should be the first port of call before turning to testosterone booster supplements[19].

1.  Khera, M. (2013) Patients with testosterone deficit syndrome and depression: https://pubmed.ncbi.nlm.nih.gov/24047633/

2.  Hwang, C., et. al. (2016) Anti-androgenic activity of absorption-enhanced 3, 3′-diindolylmethane in prostatectomy patients: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4759426/

3.  Godard, M., et. al. (2005) Body composition and hormonal adaptations associated with forskolin consumption in overweight and obese men: https://pubmed.ncbi.nlm.nih.gov/16129715/

4.  D’Aniello, D., et. al. (2012) D-Aspartate, a Key Element for the Improvement of Sperm Quality: https://www.scirp.org/journal/paperinformation.aspx?paperid=24016

5.  Rutkowski, K., et. al. (2014) Dehydroepiandrosterone (DHEA): Hypes and Hopes: https://link.springer.com/article/10.1007/s40265-014-0259-8

6.  Pliz, S., et. al. (2011) Effect of vitamin D supplementation on testosterone levels in men: https://pubmed.ncbi.nlm.nih.gov/21154195/

7.  Tomlinson, P., et. al. (2015) Effects of vitamin D supplementation on upper and lower body muscle strength levels in healthy individuals. A systematic review with meta-analysis: https://pubmed.ncbi.nlm.nih.gov/25156880/

8.  Salvati, G., et. al. (1996) Effects of Panax Ginseng C.A. Meyer saponins on male fertility: https://pubmed.ncbi.nlm.nih.gov/9063034/

9.  Fahim, M., et. al. (1982) Effect of Panax ginseng on testosterone level and prostate in male rats: https://pubmed.ncbi.nlm.nih.gov/7202345/

10.  Maheshwari, A., et. al. (2017) Efficacy of FurosapTM, a novel Trigonella foenum-graecum seed extract, in Enhancing Testosterone Level and Improving Sperm Profile in Male Volunteers: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5278660/

11.  Wankhede, S., et. al. (2015) Beneficial effects of fenugreek glycoside supplementation in male subjects during resistance training: A randomized controlled pilot study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6191980/

12.  Maggio, M., et. al. (2014) The Interplay between Magnesium and Testosterone in Modulating Physical Function in Men:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3958794/

13.  Cinar, V., et. al. (2011) Effects of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustion: https://pubmed.ncbi.nlm.nih.gov/20352370/

14.  Brilla, L., and Conte, V. (2000) Effects of a Novel Zinc-Magnesium Formulation on Hormones and Strength: https://www.asep.org/asep/asep/BrillaV2.PDF

15.  Prasad, A., et. al. (1996) Zinc status and serum testosterone levels of healthy adults: https://pubmed.ncbi.nlm.nih.gov/8875519/

16.  Stefani, G., et. al. (2018) Resistance training and L-arginine supplementation are determinant in genomic stability, cardiac contractility and muscle mass development in rats: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0204858

17.  Shirakawa, H., et. al. (2006) Vitamin K deficiency reduces testosterone production in the testis through down-regulation of the Cyp11a a cholesterol side chain cleavage enzyme in rats: https://pubmed.ncbi.nlm.nih.gov/16844298/

18.  Ito, A., et. al. (2011) Menaquinone-4 enhances testosterone production in rats and testis-derived tumor cells: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3180407/

19. GP A et all (2020) Does Exercise Boost Testosterone https://www.greatestphysiques.com/fitness/does-working-out-increase-testosterone/

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