Tinosorb M or Tinosorb S
Also known as: Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (Tinosorb M), Bis-Ethylhexyloxyphenol Methoxymethyl Triazine (Tinosorb S), MBBT, BEMT
Photostable broad-spectrum UV filter that absorbs and scatters UVA/UVB rays without degrading in sunlight.
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Get the appWhat it does
Tinosorb is a hybrid (absorbing + scattering) organic sunscreen that provides broad-spectrum UV protection while remaining stable under sun exposure—unlike some older filters that break down. It works synergistically in formulas to enhance overall SPF and photostability when combined with other filters.
Benefits
- Exceptional photostability; doesn't degrade quickly in sunlight
- Broad-spectrum UVA/UVB protection in lower concentrations than many alternatives
- Less likely to cause irritation or sensitization compared to avobenzone
- Water-resistant formulation performance
- Allows lower overall filter loads while maintaining efficacy
Who it suits
- All skin types
- Sensitive or reactive skin (when formulated well)
- Daily facial sunscreen users
- Requires regular reapplication
How to use
Apply generously to face and body 15 minutes before sun exposure; reapply every 2 hours or after water exposure. Use in conjunction with other UV-protective measures.
Pairs well with
Avobenzone, Octocrylene, Glycerin or humectants for comfort, Antioxidants (vitamin E, ferulic acid)
Be careful pairing with
None notable
Safety & cautions
Not approved in all regions (restricted in some countries; approved in EU, Australia, Japan, not currently approved in US). Some formulations may cause slight white cast or feel occlusive depending on concentration and texture. Patch test if sensitized to other filters.
Educational information, not medical advice. Concentration and formulation change how an ingredient behaves.