Melia Azadirachta Leaf Extract

Melia azadirachta (neem) leaf extract is used for its antimicrobial/anti-inflammatory claims, typically at low percentages, but botanical extracts contain multiple bioactive compounds that can provoke irritation or allergic contact dermatitis in sensitized individuals. Patch-test and case-report literature documents occasional clinically relevant reactions to neem-containing products, and the risk rises in eczema-prone or barrier-impaired skin. Given the variability of extract composition and the real sensitization potential, I score it as moderate irritancy where patch testing is prudent for highly sensitive patients. Safety Notes: In mass-market leave-on lotions/serums and rinse-off cleansers, Melia Azadirachta (neem) leaf extract is commonly used as a minor botanical support ingredient, with effective-in-formula usage frequently starting around 0.01–0.1% depending on extract strength and solvent system. Higher-strength consumer products marketed for blemish control/scalp care (toners, spot gels, masks, shampoos) can reach ~1–3%, and a small number of botanical-forward OTC formulations list/use neem leaf extract around 5% where odor/color and irritation potential are managed; levels above this are uncommon in mainstream cosmetics due to sensory impact and variability of extract solids.