Chemist insights

What is glycerin, and why is it used in skin care products?

Let's take a closer look at this popular ingredient and ask my dad what concentration is included in a moisturizer.

Ever since I started blogging about skin care, I’ve grown accustomed to seeing the same ingredients pop up over and over again. One of them is glycerin. A few months ago, a reader contacted me with an intriguing question: What’s the typical concentration of glycerin that would be included in a rich facial moisturizer? In this post, we’ll ask my dad that very question and give this ingredient some overdue attention.

Why you should probably buy name-brand sunscreen

If you find a sunscreen that works for you (hallelujah!), it's probably best to stick with it rather than trying a slightly cheaper version.

I received a question from a reader the other day, and it got me thinking about when it makes sense to save or splurge on skincare products. Sara left a comment on the Neutrogena vs. Trader Joe’s Sunscreen Stick Comparison blog post, saying that she had tried Trader Joe’s sunscreen stick as a less expensive alternative to her normal go-to sunscreen stick from ThinkBaby—but unfortunately, the TJ’s version wasn’t able to protect her daughter from sunburn. For reference,…

Peter Thomas Roth Max Sheer All Day Moisture Sunscreen Review

This chemical sunscreen includes beneficial ingredients like allantoin, vitamin E, aloe, and ceramides.

Slowly but surely, I’m going to review all the sunscreens in Sephora’s Sun Safety Kit 2018. Today, we’ll be focusing on Peter Thomas Roth Max Sheer All Day Moisture Sunscreen, which is a chemical sunscreen that includes a bunch of other antioxidants and moisturizing ingredients, including vitamins A, C, and E, pro-vitamin B5 (panthenol), aloe, and ceramides. But while writing this post, I also discovered just how confusing and unreliable ingredient lists can be—even when…