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:

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…

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.