The Index · Organic broadband UV filter (particulate)

Methylene Bis-Benzotriazolyl Tetramethylbutylphenol

Tinosorb M / bisoctrizole — hybrid organic filter that also scatters; EU Annex VI max 10%. Distinct from bemotrizinol (Tinosorb S).

StrongAuthorised broadband filter; keep naming distinct from bemotrizinol.

Written byTheSkindex Desk

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Last updated18 Sept 2026

Sources1 cited

Methylene bis-benzotriazolyl tetramethylbutylphenol (MBBT, Tinosorb M, bisoctrizole) is a broadband filter supplied as microfine organic particles. It both absorbs and scatters UV and is photostable[1].

What it does

Covers UVB through UVA. Do not confuse it with bemotrizinol (bis-ethylhexyloxyphenol methoxyphenyl triazine, Tinosorb S), a different oil-soluble broadband filter.

The evidence

EU Annex VI authorises MBBT up to 10%[1]. Not on the US OTC monograph.

How to use it

Common in European and Korean chemical sunscreens seeking broad, photostable coverage without relying solely on avobenzone.

Evidence by claim

Graded separately; the entry grade is the best-supported claim

Broadband UV absorption/scattering with good photostability[1]

Strong

EU-authorised UV filter up to 10%[1]

Strong

Safety & limits

Source and region, always

10 % · sunscreen — Annex VI authorised UV filter; maximum 10%.[1] EU UK

sunscreen — Not on the US OTC sunscreen monograph. US

Sources · 1

Numbered as cited in the text

[1]European Commission. Regulation (EC) No 1223/2009 Annex VI — UV filters allowed in cosmetic products. EU Cosmetics Regulation (2009)regulator

Revision history

18 Sept 2026Drafted by botTheSkindex Desk