MOLECULAR HYDRATORS

Humectants, Emollients, and Occlusives

Hyaluronic Acid (HA) Variances

HA is a glycosaminoglycan capable of holding 1000x its weight in water. However, marketing often obscures the reality of its molecular weight (MW).

  • High MW ( > 1,000 kDa): Too large to penetrate. Forms a viscoelastic film on the skin surface, preventing Transepidermal Water Loss (TEWL).
  • Low MW ( < 50 kDa): Penetrates deeper to hydrate, but emerging clinical data suggests ultra-low weights may trigger inflammatory responses (acting as DAMPs - Damage-Associated Molecular Patterns) in highly sensitized skin.

The Unsung Hero: Glycerin

Glycerin (Glycerol) is a trihydroxy alcohol with a molecular weight of just 92.09 g/mol. It is often superior to HA because it operates via aquaporin-3 channels, drawing moisture not just from the environment, but from deeper dermal layers upwards, ensuring sustained hydration without the film-like feel.