Glycerin

Glycerin is a highly effective humectant used to hydrate and moisturize the skin. It holds water to the surface of the skin, helping to keep the outer layer hydrated and preventing dryness. Glycerin is less buzzy than hyaluronic acid but it’s a workhorse of topical skincare for good reason. 

Glycerin keeps the skin looking hydrated and plump, it helps to soften and smooth the skin, reducing the appearance of fine lines and wrinkles. 

Glycerin can strengthen the skin's natural barrier, protecting it from external irritants and preventing moisture loss.

Sources:

Glycerol and the skin: holistic approach to its origin and functions. Br J Dermatol 2008

Moisture retention of glycerin solutions with various concentrations: a comparative study. Sci Rep 2022