A client wants a serum to help refill water loss in dehydrated skin without leaving a greasy film. Which ingredient is BEST known for binding many times its own weight in water within the upper skin layers?
a.Petrolatum
b.Hyaluronic acid
c.Beeswax
d.Stearic acid
Explanation
Hyaluronic acid is a naturally occurring polysaccharide that can hold many times its weight in water in the upper epidermis, plumping dehydrated skin without occluding it. Petrolatum and beeswax are occlusive sealers; stearic acid is mainly a thickener.
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