Acute soft-tissue complaints tend to shift fastest (days to a week), gut-related use is often discussed in the 2 to 4 week range, tendon and ligament work is usually a 4 to 8 week arc, and nerve-related recovery is the slowest at roughly 8 to 16 weeks
A subsequent study replicated suggestive linkage to this interval (Willour et al., 2004), though again without achieving genome-wide statistical significance
However, it's like dialing down the encouragement you've given your skin's collagen production
Evelyne Bischof, who runs a healthy longevity medicine practice in Shanghai and Tel Aviv, said she is not "radically against" peptide use, but her patients only use FDA-approved peptides like Ozempic, "and only from very reliable providers." She has concerns about unauthorized peptides causing allergic reactions, or including extra substances that aren't listed on the label, like steroids