What it is
Sodium heparin is a highly sulfated glycosaminoglycan supplied as a water-soluble sodium salt. In cosmetics it is included for its strong water-binding capacity, functioning as a humectant and skin-conditioning ingredient at low concentrations. It is used in moisturizing and barrier-support sunscreen formats rather than for any sun-protective role.
Safety & warnings
At the low levels used in topical cosmetics it is generally well tolerated and non-comedogenic. People who must avoid animal-derived ingredients may wish to note its typical source.
Origin & sourcing
A biological polysaccharide traditionally isolated from animal tissues; the cosmetic grade is the purified sodium salt.
Questions everyone asks
What does sodium heparin do in skincare?
It binds water at the skin surface, acting as a humectant and conditioning agent to support a softer, more hydrated feel.
Is it the same heparin used medically?
It is the same class of molecule, but in cosmetics it is used at low levels for hydration, not for any medical purpose.