✕ COPEGrooming
Castor Oil for Brow/Lash Growth
No clinical evidence for hair growth; conditioning effect makes existing hairs look marginally fuller.
Also called: castor oil · brow oil · lash oil
Verdict — cope
The mechanism does not hold. Your time is better spent elsewhere.
Evidence grade D
Nobody has demonstrated this works. Note that this grades the evidence, not the danger — read the verdict for that.
Mechanism
Ricinoleic acid has no demonstrated follicular growth pathway; the visual effect is cosmetic coating of the hair shaft.
Citations
- Bimatoprost for eyelash growth: randomized controlled trial dataJournal of the American Academy of Dermatology · 2010
The full read
Zero controlled trials support castor oil growing lashes or brows. If you want real lash/brow enhancement, prostaglandin analogs (bimatoprost) have A-grade evidence and FDA approval — with side effects worth reading about first. Castor oil is a harmless conditioner being sold as a growth serum.
Photo: Bottling castor oil. Wellcome L0005122.jpg by Wikimedia Commons · CC BY 4.0 via Wikimedia Commons.
