Rheum emodi (Himalayan rhubarb) root extract is a plant-derived ingredient rich in anthraquinones and stilbenes (such as emodin and rhapontigenin) used in skincare for its antioxidant and tyrosinase-inhibiting properties, which may help reduce hyperpigmentation. It is also studied for anti-inflammatory and antimicrobial activity.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation (redness, stinging) | Uncommon | More likely at higher concentrations or on sensitive skin. |
Allergic contact dermatitis | Rare | Sensitization to botanical anthraquinone constituents reported infrequently. |
Temporary skin staining/discoloration | Rare | Anthraquinone pigments can transiently tint skin in some formulations. |
Photosensitivity | Very rare | Limited evidence; sun protection generally advised with brightening actives. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.