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L- Ornithine-
Ornithine is a nonessential amino acid. That means it can be synthesized from other food sources. It can be made from arginine and is very similar in structure. Researchers, Pearson and Shaw say that “on a per gram basis, ornithine is about double the effectiveness - and cost - of arginine.” they report that “ornithine taken on an empty stomach at bedtime causes growth hormone release.” Ornithine shows the most promise when used with other amino acids, like arginine, lysine, or glutamine.
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