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Cyclic changes in metabolic state during the life of a yeast cell
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The factor responsible turned out to be a small copper-binding tripeptide whose endogenous concentration declines with age from roughly 200 ng/mL at age 20 to 80 ng/mL at age 60. The 50-year research arc that followed makes GHK-Cu one of the most thoroughly characterized small peptides in the literature
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Choline also acts as precursor for the neurotransmitter acetylcholine, which supports brain and muscle function
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Realistic expectations matter when your baseline diet is adequate
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