Allantoin

Allantoin — found in comfrey and replicated synthetically — is a gentle keratolytic and soothing agent that softens the stratum corneum, promotes cell proliferation, and calms irritation simultaneously. It loosens the bonds of dead skin cells without acid aggression, making it ideal for sensitive skin and for softening the flaking that retinoids and acne treatments cause. At 0.2–2% it accelerates healing of minor wounds and chapped skin and reduces trans-epidermal water loss. Non-toxic, non-irritating, and compatible with every routine step. The classic quiet fixer: nothing dramatic, reliably smoothing and calming wherever it appears.