Diglucosyl Gallic Acid (Bifunctional Antioxidant-Humectant)

What it is

Diglucosyl gallic acid is a synthetic derivative of gallic acid (3,4,5-trihydroxybenzoic acid) glycosylated with two glucose units, creating a bifunctional molecule that combines the antioxidant and tyrosinase-inhibitory properties of gallic acid with the humectant and water-solubility characteristics of glucose; gallic acid is a naturally occurring phenolic acid abundant in tannin-containing plants (gallnuts, sumac, tea, blackberries) with potent radical-scavenging, tyrosinase inhibitory, and anti-inflammatory properties; the diglucosyl modification dramatically improves water solubility vs native gallic acid, enables neutral-to-near-neutral pH formulation, and reduces potential irritation at equivalent concentrations; tyrosinase inhibition: gallic acid chelates the copper at the active site of tyrosinase with IC50 values competitive with kojic acid and arbutin; the glucoside prodrug releases gallic acid enzymatically in skin via glucosidase activity; antioxidant: scavenges DPPH, ABTS, and lipid peroxyl radicals with potency comparable to quercetin derivatives; in vitro brightening assays show comparable melanin reduction to alpha-arbutin at 2-5% use concentrations; combination with other brighteners (niacinamide, tranexamic acid) provides complementary melanogenesis inhibition at multiple pathway nodes; emerging ingredient gaining traction in Korean cosmetic brightening formulas; limited published clinical trial data but strong mechanistic rationale.

Where it sits

Serums sit after toner and before moisturiser. Thinnest to thickest, water before oil.

1. Cleanse
2. →Tone
3. →Diglucosyl Gallic Acid
4. →Moisturise
5. →SPF

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