Does rosemary oil work for hair growth? The science

rosemary oil hair loss

Is rosemary oil a natural, science-backed treatment for hair growth?  According to a lot of doctors, scientists and trichologists across the internet, yes – there’s “scientific proof” that it works as well as minoxidil. But unfortunately, that isn’t true. It all seems to be a misunderstanding of a single study: Rosemary oil vs minoxidil 2% for the treatment of androgenetic …

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Why you can’t trust study abstracts

One of the biggest sources of myths in beauty is misunderstanding how scientific research works, and how to interpret scientific evidence. A huge problem I’ve seen is people relying on abstracts – the short summary of the paper – instead of reading the full text. Here’s why this isn’t a good idea. This article is based on part of this …

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Why “scientific” products don’t always work: mechanistic reasoning

good bad mechanism outcome

There’s a troubling pattern with a lot of “science-based” cosmetic products. Many of them make claims solely based on mechanistic reasoning, rather than any actual measured effects on humans.  This is a big problem because mechanistic reasoning often doesn’t predict what happens on actual humans – and it’s especially the case with the ways these claims are often used for …

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Why “peer reviewed” studies aren’t reliable (especially for beauty science)

peer review process

There are a lot of myths in beauty, and over the years, I’ve noticed that a lot of them come from misunderstanding how science and scientific evidence works.  Here’s one big misconception: the idea that if a source is “peer reviewed”, it’s automatically higher quality than a source that isn’t. Unfortunately, it isn’t any sort of guarantee, especially for a …

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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 …

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Are plastics and petrochemical products bad for the environment?

plastic eco beauty

More beauty brands are talking about sustainability, but there’s a lot of greenwashing. In the last installment we talked about the impact of producing natural ingredients and after they go into the environment, as well as organic versus conventional farming. In this part, Jen of The Eco Well and I are breaking down myths about synthetic ingredients made from petroleum …

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