Reader questions

CeraVe Facial Moisturizing Lotion PM formula change: What's different in the new formula? (2020 edition)

The new formula is now paraben-freeā€”but that's not the only thing that's different. Let's hear My Dad the Chemist's take on all the changes.

A reader recently reached out to ask about some disappointing changes they had noticed in a fairly new bottle of CeraVe PM Facial Moisturizing Lotion. The new formula smelled terrible, and it created a temporary burning sensation upon application. Here’s what they said:

Art of the Sport sunscreen review

We'll take a closer look at the ingredients in this sport sunscreen, which is fragrance-free and water-resistant, and ask my dad what he thinks about its potential for UVA protection.

It’s not all that unusual for me to think about sunscreen on a daily basis (I’m kind of addicted, if you can’t tell by the 45 articles in the sunscreen category…), but now that sunny days are upon us, maybe it’s on the average person’s mind, too. That’s why I decided to pluck a sunscreen-related inquiry from my backlog of reader requests. This looped me in to a brand I’d never heard of before: Art of Sport, a brand that focuses on developing…

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.