Betula Alba Leaf Extract

Betula Alba (birch) leaf extract is a botanical soothing/antioxidant ingredient typically used at low concentrations, but plant extracts carry variable composition and can contain phenolics/salicylate-like constituents that provoke stinging or dermatitis in reactive or eczema-prone skin. Clinical patch-test data for birch leaf extract is limited and not strong enough to classify it as reliably "very gentle" across compromised barriers, so I rate it as mild irritation risk with occasional sensitivity possible. Safety Notes: In mass-market leave-on and rinse-off products, Betula Alba (birch) leaf extract is commonly used as a low-level botanical supporting ingredient, often at trace-to-low levels around 0.001–0.1% (especially when supplied as a diluted extract in a glycerin/propylene glycol/water carrier). Higher-strength consumer products marketed as botanical/soothing or “birch-focused” serums, toners, and masks can reach ~1–5% of the supplied extract, with practical upper limits driven by solvent load, odor/color, and stability rather than specific regulatory caps.