Hydroxyproline
An amino acid from collagen. It draws water and supports skin softness. Well tolerated.
Evidence by route
Topical application
A functional humectant amino acid. Safe.
- CIR Cosmetic Ingredient Review safety assessment
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
Hydroxyproline is an amino acid, one of the key building blocks of collagen. INCI: Hydroxyproline. In cosmetics it works as a humectant and conditioning agent, holding water and supporting skin softness. Marketing often links hydroxyproline to collagen synthesis, but that should be read carefully: hydroxyproline is part of collagen inside the skin, yet an amino acid applied on the surface does not integrate directly into dermal collagen and does not build it on its own. Its real role in a formula is conditioning and moisturizing, not structural. Pregnancy safety. Topical use, low systemic absorption, no evidence of harm. It can be used during pregnancy and lactation. Tolerance. Irritation and allergen potential are low, suitable for sensitive skin.
Frequently asked questions
Is Hydroxyproline safe during pregnancy?
Hydroxyproline is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Hydroxyproline for?
Hydroxyproline suits: normal, dry, combination, oily, sensitive.
What is Hydroxyproline and what does it do in cosmetics?
An amino acid from collagen.
What's the INCI name for Hydroxyproline?
The INCI name is Hydroxyproline.
See Hydroxyproline in a product composition right on the store page
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