In summary: He stopped washing his hair with any products and started using just cold water, in an effort to help with his dandruff problem. Overall seems to have worked for him. Seemed mildly interesting to me.
Not actually NSFW, but I tagged it because the thumbnail is a close-up of some pretty severe dandruff, and there’s a few seconds of video in the middle where he shows the condition of his scalp before quitting shampoo. Just thought I’d mention, in case that makes you squeamish.
Google tells me yes H&S does use SLS in the US, confirmed here On their US website
I did see a Reddit thread as a search result that says H&S dropped SLS as an ingredient in Europe - the thread was from 11 months ago, but I also didn’t open it to check the details. And I haven’t watched the video so I don’t know what region this guy is in.
Edit: rechecked the post and it looks like this guy stopped shampooing 7 years ago (so before H&S dropped SLS in Europe.) From my memory as a long-haired woman/regular consumer of haircare products, I would say concern over SLS started within the last 10 years. So potentially this guy in the video was making his decision to stop washing right around the time the industry was becoming aware of the risks of this ingredient. But again, that’s all conjecture based on my experience as a mildly informed consumer of haircare products lol