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Glutathione contains sulfur amino acids
MK-677 is not a peptide
Both are once-weekly injections with similar gastrointestinal side effects
Your skin may appear more even-toned and luminous, even if the actual colour doesn't change dramatically
However, researchers estimate that the lethal dose of GHK-Cu would be about 330 mg/kg of body weight, which is over 300 times larger than its known effective dose
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