Olaplex and other bond builders probably don't work by repairing broken disulfide bonds before – they do work to make hair ...

AI-generated science content is super prone to factual errors. Here’s how to spot it… Why spot AI slop? Lots of typos and grammatical errors used to signal that something wasn’t checked carefully. Now ...

I’ve had a lot of people ask me to explain the nitty gritty behind how sunscreen ingredients work. I warned everyone it would be super nerdy and really quite complicated, but a lot of people said it ...

Recently ASAP Science released a video called “The ONLY face cream that works! – according to science”. A lot of people asked me to do a response, so here it is ...

The La Roche-Posay UVMune 400 range has been super hyped up because it contains a brand new sunscreen ingredient: Methoxypropylamino Cyclohexenylidene Ethoxyethylcyanoacetate (MCE), or Mexoryl 400. It ...

Lots of people say you have to use sulfate-free shampoo to avoid damaging or stripping your hair. There also people who say you have to use shampoo with sulfates to get your hair clean. They are both ...

You might remember a similar post that I published in May 2019, after the previous flurry of “The FDA Admits Sunscreens Are Poison” headlines. Now that the second study has been published, it’s time ...

Since writing this post on the influence of pH on exfoliating acid skincare ingredients, I’ve had a lot of questions on how much active free acid there is in specific formulations. The calculation is ...

Warning: Very nerdy content ahead! If you’ve been following sunscreen discourse (apparently this is a thing now) you’ll know that mineral sunscreens mostly work by absorbing UV and only scattering a ...

Should you hydrate your hair? From all of the hydrating hair products out there, you’d think the answer is obviously, yes. But quite a lot of hair experts (including scientists) say that water is bad ...

Bobby Parrish, a home cook and food influencer who goes by the name FlavCity, has made a number of viral TikTok videos recently about dangerous personal care ingredients. As you might expect, there’s ...