Oral collagen supplementation is mainstream now — hydrolyzed collagen peptides in powder or capsule form are in every supplement store. The dermatological evidence for skin improvement from oral collagen is actually decent — multiple RCTs show improvements in skin elasticity and hydration. The mechanism: hydrolyzed collagen breaks into dipeptides and tripeptides that are absorbed and seem to signal collagen synthesis in target tissues.
The question for this community: does oral collagen supplementation affect penile tissue specifically?
Honest answer: there's no research on this specifically. The general mechanism of action doesn't discriminate by tissue type in theory — collagen-producing fibroblasts exist throughout the body including penile tissue. Whether the collagen response is meaningful in a size-affecting way is unknown. As a general tissue health intervention it's low risk and has other benefits.
— CollagenKurt