Dithiodiglycolic Acid

Dithiodiglycolic acid (DDGA) is a small-molecule reducing agent derived from glycolic acid. It functions by breaking disulphide bonds—chemical cross-links that form between keratin proteins in the stratum corneum, the skin's outermost layer. This bond-breaking action alters the structure of the outer skin barrier.In cosmetic formulations, it is used primarily for its keratolytic (skin-thinning) properties. Unlike physical exfoliants or enzymes, DDGA works through direct chemical reduction, making it a distinct approach to managing surface keratin buildup and skin texture.

DDGA is a reducing agent, meaning it donates electrons to break the disulphide bonds (S–S links) that cross-link keratin proteins. These bonds form naturally as the skin matures and keratinises; breaking them loosens the cohesion of the outer dead cell layer, allowing it to shed more readily.This mechanism differs from alpha hydroxy acids (AHAs), which work by lowering pH and disrupting corneodesmosomes (the 'glue' between cells). DDGA's bond-breaking approach is gentler on the lipid matrix and may cause less irritation in some cases, though comparative clinical data remains limited.

DDGA products are typically used as a targeted treatment or peel, often 1–2 times per week rather than daily. Start with lower frequency to assess tolerance. Apply to clean, dry skin and allow adequate contact time as directed by the product. Always follow with a broad-spectrum sunscreen during the day, as any exfoliating agent can temporarily increase sun sensitivity. If combining with other active ingredients (retinoids, vitamin C, AHAs), space applications or use on alternate days to minimise irritation.

DDGA is generally well-tolerated at appropriate concentrations and frequencies. Possible side effects include mild irritation, redness, or sensitivity, especially during the adjustment phase. Avoid use if skin is compromised, inflamed, or recently sunburned. Not recommended during pregnancy without medical guidance. If you're pregnant or breastfeeding, please check with us first — [email protected].