Sophie, just run them through INCI decoder for the easiest option, it'll signpost them. When you hover over the 'i' in a circle you get the more common name as UV filters have really complicated names.
According to an online article (get the gloss or in the gloss, can't remember, the one that's UK based anyhow) the Vichy body SPF I have is good for hair and scalp too even if not marketed as such. I had been eyeing thinking I'd give it a try so I will see how it goes today as I'll wash it tonight/tomorrow anyhow. Think I might give it a trim this morning first.
Yeah, I know what you mean, feeling like it takes forever to go beyond the shoulders. My hair and nails grow v. quickly too. I think there's also the factor that with wavy hair it becomes more pronounced the longer it gets so is probably taking forever to show any substantial length for forever as it creeps up. My hair is just about bra strap length level now but I still feel stuck in Bob/Lob country. I'm hoping another 10-12cms would do it which would be a couple of months but I'm not that optimistic.
And, yes, why haven't CG brands jumped on it? maybe because healthy protected hair isn't all that much in their interests, their entire financial model is based on damaged hair. Probably more likely due to formulation, you either end up with an oil that's probably too heavy for most to use all over the hair or you need to use silicones and/or alcohol with a lot of the filters. Some filters that are best suited for this are even silicones and the US market (which most CG brands seem to be from) are limited to a narrow range of old fashioned UV filters. If I had any idea in what was needed to create a product I'd be investing in hair SPF for daily use development right now.