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How to Use Comedogenicity Ratings (with Video)

February 21, 2019 By Michelle 30 Comments

How to Use Comedogenicity Ratings (with Video)

You’ve probably seen a comedogenicity chart like these ones (and the one further down the page) before, rating different ingredients on their ability to cause pimples. Supposedly you check the ingredients list of your product against the comedogenicity list. If it has highly comedogenic ingredients, it will cause pimples, if it doesn’t, then it won’t. It’s…

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Filed Under: Make-Up, Science, Skincare, Tutorial Tagged With: acne, controversial ingredients, Fact-check, science, skincare, tutorial

Don’t Use Lemon Juice on Your Skin

January 10, 2019 By Michelle 27 Comments

Don’t Use Lemon Juice on Your Skin

There are more DIY skincare recipes on the internet than you can shake a stick at, and most of them really, really like lemon juice. According to these DIY tips you should be slathering it all over your face and hair. Lemon juice smells nice, and it’s pretty cheap. But is it effective? And is…

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Filed Under: Analysis, DIY, Science, Skincare, Video Tagged With: active ingredients, controversial ingredients, DIY, Fact-check, natural, science, skincare, video

Is Sodium Hydroxide Safe in Beauty Products?

November 15, 2018 By Michelle 13 Comments

Is Sodium Hydroxide Safe in Beauty Products?

Sodium hydroxide is in a ton of beauty products. But as one of my favourite unreliable sources says (the “favourite” is sarcastic by the way, just to clarify): Sodium Hydroxide is, however, a known irritant… The National Institute for Occupation Safety and Health … recommends that consumers prevent skin and eye contact The CDC reports…

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Filed Under: Analysis, Science, Skincare Tagged With: active ingredients, chemistry, controversial ingredients, science

What Are Propylene and Butylene Glycol, and Are They Safe?

May 20, 2018 By Michelle 16 Comments

What Are Propylene and Butylene Glycol, and Are They Safe?

One of the common reader requests I get is for “toxic” ingredient breakdowns, so today I’m looking at two ingredients that are commonly on “avoid” lists: propylene and butylene glycol. What are propylene and butylene glycol? Glycols in chemistry are ingredients that contain two OH (alcohol) groups. Propylene glycol contains 3 carbon atoms, while butylene…

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Filed Under: Analysis, Science, Skincare Tagged With: active ingredients, analysis, controversial ingredients, science, skincare

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Michelle
Hi! I'm Michelle, chemistry PhD and science educator, and I'm here to help you figure out which beauty products are worth buying, and which ones aren't using science!

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