D-Aspartic Acid is an essential amino acid and is used in various testosterone boosting anti-estrogen supplements.
D-Aspartic Acid has been shown to improve hormone function with significant effects. In one trial using daily doses of 3.12g, 87% of participants experienced increased hormone levels, with an average increase of LH levels by 33% and testosterone by 42% (Topo 2009).
D-Aspartic Acid can be an effective supplement for building muscle in males. Muscle and fat growth is directly linked to testosterone levels with higher testosterone levels improving the ability to build muscle.