Tris-Biphenyl Triazine
Explained
Tris-Biphenyl Triazine (aka Tinosorb A2B) is one of the newer UV filters and is a bit of an overachiever in a very specific way.
It's the most efficient UVB + UVA-2 filter currently available on the market.
The UVA-2 gap is something that a lot of older UV filters miss; UVA-2 is a deep-penetrating, aging and pigmentation-driving, wavelength that you can't feel (it doesn't burn the way UVB does).
When paired with UVA-1 filters, Tinosorb A2B is able to give a "boosting" assist as well.
More cool things about this ingredient? It's highly photostable and has high SPF performance at low concentrations.
That photostability matters because plenty of older filters degrade as you wear them; this one stays put and even helps stabilize the other filters around it.
A 2015 study found this ingredient delivers about 2 SPF units and 1 UVA-PF unit per percentage used, with SPF and UVA protection holding steady after two hours under a solar simulator.
Safety-wise, it's been formally reviewed and cleared. Both the EU and Australia approve it as a UV filter up to 10%.
Because it has a high molecular weight, significant absorption through the skin is quite low and there has been no evidence of phototoxicity or photoallergenicity in a human study on 53 subjecfts.
You won't be able to find this ingredient in the US yet due to FDA regulatory backlog.
See all 110 products with Tris-Biphenyl Triazine
