The 3 Best
D-Aspartic acid is a natural amino acid that can boost low testosterone levels.
Research suggests that the primary way it works is by increasing follicle-stimulating hormone and luteinizing hormone.
This is important, because luteinizing hormone makes the Leydig cells in the testes produce more testosterone.
Initial research in animals and humans has found that as little as 12 days of D-aspartic acid seems to increase luteinizing hormone as well as testosterone production and transportation around the body.
It may also aid in sperm quality and production. One 90-day study gave D-aspartic acid to men with impaired sperm production. Sperm count doubled, rising from 8.2 million sperm per ml to 16.5 million sperm per ml.
In another study, athletic men with healthy testosterone levels followed a 28-day weight-lifting routine. Half of them were given 3 grams of D-aspartic acid per day.
Both groups showed significantly increased strength and muscle mass. However, there was no increase in testosterone in the D-aspartic acid group.
Taken together, these findings suggest that taking D-aspartic acid may be most beneficial in people with low testosterone or in those with impaired sexual function, but not necessarily in individuals with normal testosterone levels.
You can purchase D-aspartic acid online.
BOTTOM LINE:D-Aspartic acid may work by stimulating some key testosterone-producing hormones. Doses of 2–3 grams seem to be effective for those who are testosterone deficient.
Vitamin D is a fat-soluble vitamin produced in the skin when exposed to sunlight.
Its active form functions as a steroid hormone in the body.
Nowadays, a large portion of the population has very little exposure to sunlight, resulting in low or deficient levels of vitamin D.
Increasing your vitamin D stores may boost testosterone and improve other related health measures, such as sperm quality.
One study found a close correlation between vitamin D deficiency and low testosterone. When participants spent more time in the summer sun and their vitamin D levels increased, so did their testosterone levels.
In a year-long study, 65 men were split into 2 groups. Half of them took 3,300 IU of vitamin D every day. The supplement group’s vitamin D levels doubled and their testosterone levels increased by around 20%, from 10.7 nmol/l to 13.4 nmol/l.
To get more vitamin D, increase your sun exposure. You can also take around 3,000 IU of vitamin D3 daily and eat more vitamin-D-rich foods.
You can find vitamin D supplements online.
BOTTOM LINE:Vitamin D is an important vitamin that may boost testosterone levels, especially if your vitamin D levels are deficient.
Tribulus (Tribulus terrestris) is an herb that has been used for centuries in herbal medicine.
Most of the current research on it consists of animal studies, which show improved sex drive and increased testosterone levels.
One 90-day study in men with erectile dysfunction found that taking tribulus improved self-reported ratings of sexual health and increased testosterone levels by 16%.
However, the current research has shown no benefit of taking tribulus for young elite athletes and healthy individuals with normal testosterone levels.
As with most other testosterone boosters, it appears tribulus has benefits in those with low testosterone or impaired sexual function, but does not appear to increase testosterone in individuals with normal or healthy levels.
You can find tribulus terrestris online.
BOTTOM LINE:Tribulus may help with sex drive and improve sperm health, as well as increase testosterone in men with impaired sexual function.