Proline is a non-essential amino acid and a key component of collagen, used in skincare as a humectant and skin-conditioning agent to support hydration and the skin barrier. It is generally well tolerated and often included in formulations for its moisturizing and structural-protein-supporting properties.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient irritation or stinging | Rare | Possible on sensitive or compromised skin, typically minor and short-lived. |
Allergic contact dermatitis | Very rare | Rarely reported; amino acids are generally low-sensitizing. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.