Does Magnesium Increase Testosterone? What Science Says

The Link Between Magnesium and Testosterone Levels

Testosterone declines gradually with age; in the Massachusetts Male Aging Study, total testosterone fell by roughly 1–2% per year from midlife onward. Fatigue, reduced muscle mass, lower libido, and mood shifts can accompany this, but they have many causes.

Nutrient status may also play a part: in a study of 399 men aged 65 and older, blood magnesium levels were positively associated with testosterone, independent of other factors.

Magnesium is a cofactor in more than 300 enzyme systems, including those involved in energy production and protein synthesis. So, is magnesium good for testosterone? It plays a supportive role in normal hormone function rather than directly “boosting” levels.

“It takes a lot of biochemical mechanisms to support our body's energy level. In this regard, magnesium is an integral component in over 300 enzymes and some of them have direct involvement in energy generation. Magnesium activates adenosine triphosphate (ATP), the key source of energy within the cell,” explains Jane Moon, Pharmacist.

Low intake is common. According to the NIH Office of Dietary Supplements, U.S. dietary surveys consistently show that many people consume less magnesium than recommended.

Clinical deficiency is less common because the kidneys limit magnesium loss, but low intake over time can reduce magnesium status. Observational studies have associated lower magnesium status with lower testosterone.

Stress is another key piece of the puzzle. Cortisol and testosterone are linked: chronic stress and sustained high cortisol are associated with lower testosterone.

Magnesium contributes to normal nervous system function, and in an 8-week trial in 46 older adults with insomnia, 500 mg/day of magnesium was associated with lower serum cortisol than placebo.

“Cortisol is produced by the adrenal glands in reaction to the brain signals. The signal is sent to the pituitary gland by the hypothalamus and the pituitary gland orders the adrenals to release cortisol. The latter chain is referred to as the HPA axis,” highlights Jane Moon.

Magnesium may also interact with SHBG, a protein that binds testosterone and makes it unavailable to tissues. In laboratory research, magnesium reduced testosterone's binding to SHBG, which could leave more testosterone in its free form. This effect was observed in lab samples rather than measured directly in people.

For a broader look at how magnesium supports overall hormonal health, our guide on magnesium for hormone balance breaks this down in more detail.

Does Magnesium Boost Testosterone? Here's What Studies Show

Research examining magnesium and testosterone shows a supportive relationship rather than a direct boosting effect. Studies suggest it may contribute to healthy free testosterone and overall hormonal balance, especially in men with lower magnesium levels to begin with.

One of the most cited studies in Biological Trace Element Research followed 30 healthy men aged 18–22, including sedentary men and tae kwon do athletes, for four weeks. Men taking magnesium (10 mg per kg of body weight daily, a research dose above the general supplement upper limit) had higher free and total testosterone at rest and after exhaustive exercise. The increases were larger in the group that also trained. Because the study was small, short, and in young men, results may not apply to everyone.

“Magnesium supplementation is generally safe for most healthy athletes. However, excessive intake of this mineral may cause gastrointestinal problems, such as diarrhea. Magnesium can also affect the pharmacokinetics of some antibiotics,” cautions Jane Moon.

According to the NIH, magnesium supplements can interact with bisphosphonates (osteoporosis medicines), tetracycline and quinolone antibiotics, diuretics, and proton pump inhibitors. People with kidney disease are at higher risk of magnesium buildup.

Laboratory research on magnesium and SHBG suggests magnesium may compete with testosterone for SHBG binding, which in theory leaves more bioavailable testosterone (the form tissues can use). Human trials have not yet measured this mechanism directly.

So, does magnesium boost testosterone in a meaningful way? Observational research has found a positive association between magnesium status and testosterone, and the small trial above found increases after supplementation.

Any benefit is most plausible for people with low magnesium intake or status. There's little evidence that extra magnesium raises testosterone when magnesium levels are already adequate.

In short, magnesium isn't a shortcut or a replacement for medical treatment. It is a nutrient that supports normal hormone function as part of a balanced diet and healthy lifestyle.

If you have symptoms of low testosterone, a clinician can test your levels and discuss diagnosis and treatment.

How Much Magnesium Should You Take? Dosage and Timing Tips

There's no established magnesium dose specifically for testosterone.

“The RDA for adults is 310 to 420 mg per day from all sources, like food and supplements. The upper limit for supplements is 350 mg,” says Dr. Jason Schroder.

For supplements and medications, the NIH sets the tolerable upper intake level at 350 mg/day for adults; higher amounts can cause diarrhea, nausea, and cramping. Most supplements provide 100–350 mg of elemental magnesium per serving.

Consistency matters more than perfect timing. Taking magnesium daily helps maintain adequate magnesium status over time. Many people take it in the evening: in the 8-week trial in older adults with insomnia, magnesium improved sleep efficiency and total sleep time compared with placebo.

If you're active, magnesium needs may be slightly higher. Magnesium is lost in sweat, and research suggests strenuous training may increase requirements. Adequate intake supports normal muscle function and energy metabolism.

Diet should form the foundation. Per the NIH, good sources include roasted pumpkin seeds (156 mg per oz), chia seeds (111 mg per oz), almonds (80 mg per oz), boiled spinach (78 mg per ½ cup), and cashews (74 mg per oz). Supplements can help fill gaps, and well-absorbed forms like magnesium glycinate are a practical choice for daily use.

Talk with your healthcare provider before starting magnesium, especially if you have kidney disease, are pregnant or nursing, or take antibiotics, osteoporosis medications, diuretics, or acid-reducing medications.

Magnesium Glycinate and Other Forms: Which to Choose

Magnesium glycinate (bisglycinate) is magnesium bound to the amino acid glycine. It's a popular choice for daily use because chelated and organic forms are generally better absorbed than magnesium oxide, and glycinate is commonly chosen for being gentle on digestion.

So, does magnesium glycinate increase testosterone? No study has tested glycinate specifically for testosterone. Its value lies in helping you maintain adequate magnesium intake.

“Glycine, which is present in magnesium glycinate, is itself a calming (inhibitory) neurotransmitter and works together with magnesium. Hence, magnesium glycinate is considered a well-tolerated option. It is well absorbed and unlikely to cause gastrointestinal problems,” mentions Jane Moon.

One of the key advantages of magnesium glycinate is its bioavailability: more of each dose is absorbed and used by the body.

By contrast, magnesium oxide is inexpensive but poorly absorbed. In one absorption study, only about 4% of magnesium from magnesium oxide was absorbed, compared with significantly higher absorption from chloride, lactate, and aspartate forms.

Magnesium citrate is also better absorbed than oxide, but higher doses can have a laxative effect.

If you're choosing a supplement, look for chelated forms like magnesium glycinate, third-party testing, and clearly listed elemental magnesium content per serving.

Beyond Testosterone: Magnesium’s Broader Benefits for Men

While much of the focus is on magnesium and testosterone, magnesium plays a role in several areas of men's health, making it a well-rounded addition to a daily routine and broader approaches such as men's health supplements.

Sleep is one of the most important factors. Testosterone rises during sleep, and the increase is linked to normal sleep cycles; fragmented sleep blunts this nighttime rise.

“Many people simply take a magnesium supplement without knowing how it works. When you sleep, your brain doesn't just get tired, it has to go into a quiet, peaceful state to fall asleep, and that's where magnesium comes into play. Research, mostly in animals, suggests magnesium supports the activity of GABA, the brain's main calming neurotransmitter, which helps reduce over-excitement so your brain can settle,” emphasizes Dr. Olga Bachilo.

Magnesium is also essential for physical performance. It's involved in ATP production (the body's energy currency), muscle contraction, and recovery, making the connection between magnesium and exercise especially relevant for those focused on strength, endurance, and training consistency.

Stress is another factor. Chronic stress is associated with higher cortisol and lower testosterone, and magnesium contributes to normal nervous system function, which is another reason people ask whether magnesium is good for testosterone.

Magnesium also contributes to normal blood vessel function and healthy circulation.

Beyond this, magnesium contributes to normal energy metabolism, nervous system function, and psychological function.

The Bottom Line on Magnesium and Testosterone

So, does magnesium increase testosterone? Research links adequate magnesium status with healthy testosterone levels, and one small trial found increases after supplementation, mainly in active young men.

Lab research suggests SHBG may be part of the mechanism. Rather than acting as a “booster,” magnesium is a foundational nutrient that supports normal hormone function, especially for people whose intake is low.

Among available forms, magnesium glycinate is a practical option due to its good absorption and gentle effect on digestion, making it well-suited for consistent daily use. Magnesium works best as part of a healthy lifestyle that includes a balanced diet, quality sleep, and regular exercise.

At WOWMD, we offer magnesium formulations. Explore our men's health supplements and magnesium collections, or see our guide on choosing a magnesium supplement for men.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Meet The Experts

• Jane Moon, Pharmacist & Director at Herba Health Inc.
• Dr. Jason Schroder, Medical Director & Co-Founder, Craft Body Scan
• Dr. Olga Bachilo, MD, FACS Female Plastic Surgeon at Glamour Plastic Surgery and Med Spa