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That is true with any aggressive caloric deficit, including the one retatrutide creates

This is normal

Copper is a required cofactor for lysyl oxidase, the enzyme that cross-links collagen and elastin which offers a route by which a copper carrier could affect matrix quality

Its short half-life is a real constraint on any incubation in a protease-containing medium

Some peptides may also be available in topical, oral, or nasal spray forms, depending on the compound

Though there arent yet large-scale human trials on BPC 157 fertility outcomes, there is promising anecdotal evidence from patients and functional medicine providers who use peptides to support menstrual cycles, egg quality, and hormonal health