Neem extract comes from the leaves, bark, or seed oil of the neem tree, native to South Asia, and contains limonoid compounds like nimbin and nimbidin along with flavonoids and tannins.
Laboratory testing has found meaningful antibacterial activity against Cutibacterium acnes, the bacteria strain associated with acne, attributed to these limonoid and flavonoid compounds disrupting bacterial cell growth, and nimbidin specifically has shown anti inflammatory activity in preclinical models.
This combined antibacterial and anti inflammatory profile forms the mechanistic basis for neem's traditional use in acne remedies, though robust human clinical trial data on topical neem for acne is sparse compared to the laboratory evidence.
Neem Extract References
Azadirachta indica Hexane Extract, Potent Antibacterial Activity Against Propionibacterium acnes and Identification of its Chemical Content, Pharmacognosy Journal
Azadirachta indica (Neem) as a Potential Natural Active for Dermocosmetic and Topical Products, a Narrative Review, Cosmetics (MDPI), 2022
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