Glycerin works in a few different ways. First, it’s highly hygroscopic, meaning it draws moisture to itself even in low-humidity environments. That means it’s great for hydrating skin - in fact, it works as well or better than just about every other humectant on the market.
Second, it expands the space between skin cells, which helps in two ways. It increases the amount of moisture the skin can hold onto it, and it also plumps the appearance of the skin which can reduce the appearance of fine lines.
Third, it can stimulate and speed up barrier repair. Your skin’s moisture barrier is crucial for overall skin health, and in studies, skin treated with glycerin showed faster barrier repair than skin treated with a non-glycerin control formula.
Finally, it can regulate the microscopic water channels in your skin called aquaporins. By doing this, glycerin can actually increase the hydration level of the skin long after it’s washed off.
Glycerin may sound like a boring ingredient, but it truly is magical.
- Baumann, L. (2015). Cosmeceuticals and cosmetic ingredients (First Edition, pp. 51-53). McGraw-Hill Education/Medical.