• Aspartic acid is an amino acid. Amino acids are building blocks of proteins.
• Aspartic acid helps every cell in the body work. It plays a role in:
- Hormone production and release
- Normal nervous system function
• Aspartic acid comes in two forms: L-aspartic acid and D-aspartic acid.
- L-aspartic acid becomes part of proteins synthesized in the body and is responsible for encouraging the production of antibodies that support the function of the body’s immune system.
- D-aspartic acid is not used to synthesize proteins. It is typically found in the pituitary gland and the testes, and is involved in the regulation, release, and synthesis of testosterone and luteinizing hormone (LH). D-aspartic acid can increase the release of a hormone in the brain that will ultimately result in testosterone production.
• Building muscle mass: Due to its role in the regulation of testosterone levels, D-aspartic acid has become a popular ingredient in supplements aimed at people who wish to build muscle mass and strength.
• Increasing fertility: In a study including 30 men with reduced sperm motility (asthenozoospermia) and 30 men with a low sperm count (oligoasthenozoospermia), a daily dose of D-aspartic acid for 90 days resulted in a significant increase in both the amount of sperm and the motility of the sperm the men produced.
• Increased Testosterone Levels: One study in healthy men aged 27–37 examined the effects of taking D-aspartic acid supplements for 12 days. 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%. Three days after they stopped taking the supplement, their testosterone levels were still 22% higher, on average, than at the beginning of the study