It helps moisturize and protect your skin. A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid. La Roche-Posay Effaclar Duo [+] SPF 30 contains this as ingredient number 3. La Roche-Posay Effaclar Mat Daily Face Moisturizer For Oily Skin contains this as ingredient number 2. 3. ZRzskX.