01
Three categories
Three categories that get blended together
- Dietary collagen peptides: oral protein fragments marketed for skin, hair, nails, and joints.
- Topical cosmetic peptides: ingredients used in skin care formulas.
- Medical or compounded peptides: prescription products that require provider review and pharmacy controls.
"Peptides for skin" covers three completely different products. Collapsing them is how marketing works — and how patients get confused.
02
GHK-Cu interest
GHK-Cu and copper peptide interest
GHK-Cu is frequently discussed for collagen, skin texture, hair, and wound-related biology. The key question is formulation and use case. A topical cosmetic claim is different from an injectable medical claim, and each needs its own evidence and safety review.
03
What to track
What to track
Use consistent photos, lighting, routine, and timeline. Skin changes are easy to misread when you also change retinoids, sunscreen, lasers, diet, sleep, and weight at the same time.
04
Safety basics
Safety basics
Skin peptide products can still irritate, interact with a routine, or encourage unrealistic expectations. Injectable products require a prescription and clinician oversight. Avoid using research products on or in your body.
Sources