Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (also known as Bisoctrizole or Tinosorb M) is a hybrid organic-particulate UV filter that absorbs and scatters both UVA and UVB radiation. It is widely used in sunscreens for broad-spectrum photoprotection and offers good photostability.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation | Rare | Mild transient irritation possible, particularly in sensitive skin. |
| Allergic contact dermatitis | Very rare | Isolated case reports; considered to have low sensitizing potential. |
| White cast or cosmetic residue | Uncommon | Due to its particulate nature it can leave visible film at higher concentrations, a cosmetic rather than medical effect. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.