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Glutamine is an amino acid naturally present in the human body and commonly used as a supplement by athletes to enhance performance and promote muscle recovery

doi: 10.1016/S0264-410X(00)00257-7 242 MurphyJR

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Selank Nasal Spray a synthetic peptide analog of tuftsin, developed and studied for its potential influence on central nervous system pathways including learning, pain, and mood disorders GHK-CU a naturally occurring copper peptide found in the human body