Collagen beauty-from-within stack
Oral collagen peptides plus topical signal peptides—a common “inside + outside” approach.
Brands cross-sell powders and serums. Evidence levels differ: topical peptides ≠ oral hydrolysates.
Practical notes
- Oral collagen studies often use 2.5–5 g daily for months.
- Topical peptides need weeks on the skin side too.
- Hydration and SPF still do more than either alone.