Briogeo Organic + Cold-Pressed 100% Castor Oil. $26 at Sephora. $33.99. Reviewers love this cold-pressed castor oil from Briogeo, but several warn that, as with most hair oils, a little goes a For instance, a trial of 40 alopecia areata patients observed the difference between a gel with betamethasone and garlic, and a placebo. Ninety-five percent of the recipients of the garlic gel observed “good to moderate” responses, as opposed to five percent with the placebo. What’s more, there were no adverse reactions observed. .

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