No information is currently available regarding the effects of using D-aspartic acid with other forms of exercise. Summaryĭ-aspartic acid does not appear to improve muscle or strength gains when combined with a weight training. ![]() No information is currently available about combining these supplements with other forms of exercise, such as running or high-intensity interval training (HIIT). Thus, the D-aspartic acid didn’t work any better than the placebo in this study.Ī longer, three-month study also found that men who exercised experienced the same increase in muscle mass and strength, regardless of whether they took D-aspartic acid or a placebo ( 10).īoth of these studies concluded that D-aspartic acid is not effective at increasing muscle mass or strength when combined with a weight-training program. What’s more, both groups experienced similar increases in muscle strength. However, those in the placebo group experienced a similar increase of 3 pounds (1.4 kg) ( 5). One study found that when men took D-aspartic acid and weight trained for 28 days, they experienced a 2.9-pound (1.3-kg) increase in lean mass. However, studies have shown that men performing weight training experienced no increases in testosterone, strength or muscle mass when they took D-aspartic acid supplements ( 5, 9, 10). Some think it may increase muscle or strength gains due to increased testosterone levels. Several studies have examined whether D-aspartic acid improves the response to exercise, particularly weight training. However, it has not been shown to boost testosterone in men who weight train. Summaryĭ-aspartic acid may increase testosterone in inactive men or those with low testosterone. ![]() Similar research in women is not currently available, perhaps because some of the effects of D-aspartic acid are specific to the testicles ( 4). However, a three-month follow-up study using 6 grams per day showed no change in testosterone ( 10). What’s more, another study found that two weeks of taking a high-dose supplement of 6 grams per day actually decreased testosterone in young men who weight trained ( 9). One found no increase in testosterone in young adult men who performed weight training and took D-aspartic acid for 28 days ( 5). However, three other studies did examine the effects of D-aspartic acid in active men. These studies did not specifically use a physically active population. The researchers found when men aged 27–43 took supplements of D-aspartic acid for 90 days, they experienced a 30–60% increase in testosterone ( 8). However, those with lower testosterone at the beginning of the study experienced increases exceeding 20% ( 7).Īnother study examined the effects of taking these supplements for longer than a month. Some men had no increase in testosterone. Three days after they stopped taking the supplement, their testosterone levels were still 22% higher, on average, than at the beginning of the study.Īnother study in overweight and obese men taking D-aspartic acid for 28 days reported mixed results. It found that 20 out of the 23 men taking D-aspartic acid had higher testosterone levels at the end of the study, with an average increase of 42%. One study in healthy men aged 27–37 examined the effects of taking D-aspartic acid supplements for 12 days ( 6). Some studies have shown that D-aspartic acid can increase testosterone, while other studies have not. Research on the effects of D-aspartic acid on testosterone levels has yielded mixed results. Because of this, it is often found in testosterone-boosting supplements. D-aspartic acid is the form involved in testosterone production and release in the body. SummaryĪspartic acid is an amino acid found in two forms. These functions are the reason why D-aspartic acid is popular in testosterone-boosting supplements ( 5). It also plays a role in increasing testosterone production and release in the testicles ( 3, 4). Instead, it plays a role in making and releasing hormones in the body ( 1, 2, 3).ĭ-aspartic acid can increase the release of a hormone in the brain that will ultimately result in testosterone production ( 2). However, D-aspartic acid isn’t used to build proteins. L-aspartic acid is produced in nature, including in your body, and used to build proteins. The forms have the same chemical formula, but their molecular structures are mirror images of each other ( 1).īecause of this, the L- and D- forms of an amino acid are often considered “left-handed” or “right-handed.” For example, aspartic acid can be found as L-aspartic acid or D-aspartic acid. They’re the building blocks of all types of protein, as well as certain hormones and neurotransmitters.Īlmost every amino acid can occur in two different forms. Amino acids are molecules that have several functions in the body.
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