Experts say it’s essential for male sexual function ( 7).

In its active form, vitamin D functions as a steroid hormone in the body. People with limited exposure to sunlight may have low levels of vitamin D. Vitamin D is a fat-soluble vitamin that your body produces upon exposure to sunlight. Summaryĭ-Aspartic acid may work by stimulating some key testosterone-producing hormones. Overall, research into whether D-aspartic acid can help people with low testosterone or impaired sexual function appears inconclusive. Half of them took 3 grams of D-aspartic acid per day.Īll participants reported an increase in strength and muscle mass, but no one in the D-aspartic acid group experienced increased testosterone ( 5).Ī 2017 study also found that D-aspartic acid raised neither testosterone levels nor resistance training outcomes ( 6).įurthermore, research published in 2020 found that taking 3 grams of D-aspartic acid did not affect testosterone levels in humans, while taking 6 grams appeared to reduce its levels ( 7). In a 2013 study, athletic men with healthy testosterone levels followed a 28-day weight lifting routine. Sperm count doubled, rising from 8.2 million sperm per mL to 16.5 million sperm per mL ( 4).

One 90-day study gave D-aspartic acid to men with impaired sperm production. It may likewise benefit sperm quality and production. It may also enhance their transportation around the body ( 3). One study found that taking D-aspartic acid for 12 days may boost the production of luteinizing hormone and testosterone. Research suggests that it works mainly by increasing levels of follicle-stimulating hormone and luteinizing hormone, the latter of which stimulates Leydig cells in the testes to produce more testosterone ( 3). D-Aspartic acid is a natural amino acid that can boost low testosterone levels.

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