Eine unzureichende Versorgung mit EAA kann auerdem zu Muskelschwche beitragen
For dietary deficiency, NICE CKS suggests taking oral cyanocobalamin between meals
PubMed Copper peptide and skin remodeling literature Used to keep skin and collagen claims connected to PubMed rather than cosmetic marketing alone

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He describes it as a gastric pentadecapeptide synthesised from gastric juice, says its tolerated well even orally, and says injecting it at the site of an injury helps call platelets to that location (source)
It is a research peptide and is not FDA-approved for any condition