Magnesium and Testosterone: Less SHBG and More Free-T

By Ali Kuoppala | Last reviewed Tue 25 September 2018

Medical Review by Dr. Vlad Belghiru, MD

Magnesium is the 11th most-abundant mineral in the human body, and it controls more than 300 bodily functions, along with hundreds of enzyme functions. Most people associate the mineral only with bone and heart health, but it’s so much more than just for the heart and bones…

…You see magnesium is also the primary electrolyte used by virtually all of the bodily enzymes. It maintains fluid balance, gives energy to the cells (ATP), activates creatine, improves sleep quality, and increases the amount of bio-active (free) testosterone.

All that’s great, but the thing that I’m most interested in the last one. Magnesium increasing free testosterone levels:

Magnesium and Testosterone Levels

dark chocolate is high in magnesiumMagnesium is very similar to zinc when it comes to increasing testosterone levels.

Deficiency in both will seriously lower testosterone levels, but if you’re already having adequate amounts of the minerals in your system, then megadosing with them will not do much for your hormones.

And this is where it all boils down. Do you actually need more magnesium?

research suggests that you probably do, as this study shows that nearly 70% of the adults in the United States eat below the recommended RDA of magnesium, 19% eating less than half of the recommended daily value.

On top of that, magnesium evaporates from the body through sweat, so if you’re hitting the gym, or living in a hot place, then it’s very likely that you’re not consuming enough of this essentially important mineral (especially if your eating habits are based around the Western diet).

Back to the actual subject, here are some studies:

a) This in-vitro study found out that magnesium free’s bound testosterone and makes it more bio-active. This happens because the mineral inhibits SHBG (sex hormone binding globulin), which is a molecule that binds to free testosterone, making it unavailable for the receptors.

b) In this human study, roughly one gram of magnesium was enough to increase free testosterone levels by 24% in combination with intense exercise.

c) In this study which had 400 participants, the researchers found out that in older men, higher serum magnesium levels correlate with higher testosterone levels.

d) The researchers in this review study found out something very similar about magnesium as the studies cited above. This is what they write: “there is evidence that magnesium exerts a positive influence on anabolic hormonal status, including testosterone, in men.”

e) In this study, the researchers found out that Gitelman’s syndrome (which causes imbalances in magnesium and calcium levels) often leads to delayed puberty in young boys, most likely this delay in puberty is caused by low testosterone levels, and the low T is caused by low magnesium and calcium levels.

So all-in-all, it seems that there’s a point in supplementing with magnesium, especially if you’re exercising.

However, if you sit at the couch all day, and already consume plenty of magnesium, then it’s likely that extra supplementation isn’t going to do much.

Frequently Asked Questions

Does magnesium boost testosterone?

Answer: Since magnesium lowers SHBG, it is likely to boost free testosterone levels naturally by leaving more of the bioactive portion of the hormone into the bloodstream, making it available to attach into the androgen receptors (AR).

What is the best form of magnesium to supplement with?

Answer: Magnesium glycinate (affiliate link) is the best form of oral magnesium in terms of absorption, whereas oxide is the worst (and most used).

How much magnesium should a man take daily?

Answer: The RDA (required daily amount) of magnesium for a grown man is 400-420mg per day, which is the bare minimum you should be getting. Individuals who are active and sweat much (which removes magnesium through the sweat glands) may need 1000-2000mg per day. This higher dosage is also optimal for hormone production according to the clinical evidence presented in the study from Selcuk University.

What are the best dietary sources for magnesium?

Answer: Contrary to popular belief, grains are not a reliable source of magnesium due to the high amount of phytic acid. You’re far better of by consuming the following foods: Raw cacao products, unprocessed salts, meat, leafy greens, and some nuts.

I’ve heard that calcium blocks the absorption of magnesium?

Answer: Calcium, zinc, magnesium, and iron all bind to the same receptors inside the body, however, the receptors can uptake around 800 mg’s of minerals, so unless you’re mega-dosing on all of them simultaneously, you should be fine in terms of absorption


Magnesium is very much like zinc in terms of increasing testosterone. If you’re deficient in it, your testosterone levels will decrease quite significantly, but if you have plenty of it in your system already, then consuming, even more, isn’t going to do much…

…But as explained above, the majority of us in this planet can’t get enough of magnesium, to begin with, so supplementation in most cases is going to increase baseline testosterone. If you’re looking for high-quality magnesium supplement, take a look at this article.

Ali Kuoppala

Ali Kuoppala is the founder of Anabolic Men. He has authored and co-authored multiple men's health books and focuses on uncovering the methods of optimizing hormonal health. To date, his articles on various websites have been read more than 15-million times. To read more about Ali, visit his Medium article.