DMDM hydantoin and formaldehyde in haircare

Tony Youn dmdm hydantoin

DMDM hydantoin is a preservative commonly found in shampoos. It started getting a lot of attention in 2021, thanks to a number of lawsuits surrounding hair loss – so let’s talk about the science behind it and whether it’s safe. (This post is partly based off a longer video about haircare misinformation on TikTok, which also covers sulfates, silicones, testing …

Read more

The “Everything” Serum: Olay Super Serum

olay super serum

I’ve been reviewing beauty products for more than 10 years, so not a lot of things excite me – but some things did in 2023. The Olay Super Serum was one of them! The video version of this review is here, keep scrolling for the text version…. Olay Super Serum is the best new skincare product I’ve tried in a …

Read more

How to find transfer-proof eyeliner pencils

smudgeproof eyeliner seal

Something that made a big difference to me in 2023: I worked out how to find eyeliner pencils that were transfer-proof even on my oily skin!  My eyelids are super oily, so eyeliners always smudge or start transferring after a few hours. Transfer-proof pencils aren’t really that new an innovation, but for the longest time I didn’t really know what …

Read more

How do colour-changing lipsticks and blushes work? The science

Red 21 Red 27 colour changing

Have you seen colour-changing lipsticks and blushes online? A lot of these claim to “adjust” to your skin’s pH to give a personalised shade… but is it just a gimmick? Here’s the chemistry behind these products. Colour-changing ingredients Red 27 Most colour-changing products – whether lipsticks or blushes – contain an ingredient called Red 27, also listed as CI 45410 …

Read more

Ultimate Guide to Drug Retinoids

drug retinoids thumbnail

Drug retinoids – tretinoin, adapalene, tazarotene and trifarotene – are some of the most powerful ingredients in skincare. They can help with issues like acne, uneven texture and hyperpigmentation. But what are the differences between them? Here’s the guide for you! My PhD is in medicinal chemistry, so I’m going to be diving into the differences at a drug structure …

Read more

Vitamin C doesn’t work? Debunking Science Vs Skin Care Podcast

Science Vs Skincare Podcast

The Science Vs podcast episode on Skin Care: Is Anti-Aging a Scam? in part inspired my recent post on whether retinol in cosmetic skincare products worked. I’ve had some questions about some of the other parts of the podcast, especially about vitamin C and whether it actually penetrates skin. As I’ve discussed before, vitamin C in L-ascorbic acid form is …

Read more