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D-Asp is an endogenous amino acid and is found in the neuroendocrine tissues of humans!

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D-Asp is an endogenous amino acid and is found in the neuroendocrine tissues of humans. There is evidence that D-Asp plays a role in sperm production and that it is involved in the release of testosterone (T), growth hormone (GH), and luteinizing hormone (LH). It also modulates melatonin synthesis and is found in high concentration in the pineal gland.

In men, D-Asp has been found to improve motility of sperm and raise Testosterone levels. In an Italian study, after supplementing with a 20 mM solution of D-Asp (about 3000 mg of D-Asp) for 12 days, 87% of the subjects had significantly increased LH and T levels (from 4.5ng/ml serum to 6.4ng/ml) by 33 and 42 percent, respectively.