Hydroxypinacolone Retinoate (HPR) is an ester of retinoic acid that binds directly to retinoid receptors without prior metabolic conversion. It is used in cosmetic formulations to address signs of aging, uneven texture, and acne, and is generally regarded as gentler than traditional retinoids.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or stinging | Uncommon | Generally milder than retinol or retinoic acid; more likely at higher concentrations. |
Dryness or flaking | Uncommon | Typical of retinoid activity but reported less frequently than with conventional retinoids. |
Erythema (redness) | Rare | May occur during initial use or with sensitive skin. |
Photosensitivity | Rare | As with retinoids, sun protection is advised though HPR is considered relatively photostable. |
Allergic contact dermatitis | Very rare | Isolated sensitivity reactions possible as with many cosmetic ingredients. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.