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Because of their size and structure, many can work precisely at a cellular level, often mimicking natural messenger molecules like hormones or neurotransmitters

Metabolism and Elimination BPC-157 undergoes rapid metabolic degradation into smaller peptide fragments and ultimately individual amino acids

Research-use GHK-Cu is not FDA-approved for human injection, and route decisions should come from a licensed clinician

Pineal peptides do not have the extensive clinical trial data that pharmaceutical sleep aids do

When the experiment was run in serum-containing medium the distinction partly collapses anyway, because free GHK will acquire copper from the medium, but that only means the effective species was never under the experimenter's control