42 people drank a 10g mixture of glycine, glutamine and niacin daily for 3 weeks saw an increase in serum growth hormone (GH) levels by 70%, but this GH increase was not associated with improvement in mood or memory. Circulating Insulin-like growth factor 1 (IGF-I) levels did not change.
Most "niacin" products are niacinamide. If you want the form discussed in this research, look for nicotinic acid specifically.
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