D Aspartic Acid is a great supplement that increases testosterone levels in men and can help them build muscle.
D-Aspartic Acid (DAA) is a non-essential amino acid. That means your body produces it internally. In recent years, supplementation with DAA has gathered increasing interest for athletic performance enhancement as DAA appears to play a significant role in the neuroendocrine system of vertebrates, especially with regards to production of male sex hormones and growth factors.
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