THE PILL: Pierre Michel RepHair
THE CLAIM: AC-11, a proprietary extract of Uncaria tomentosa (the cat's-claw plant from the rain forest), repairs damaged DNA in hair cells to reduce dryness, thinning, and breakage while increasing shine and thickness.
COST: $24 for a 30-day supply
GLASSMAN SAYS: "Oral supplements can only affect the new hair growing in. Hair ends are old and dead, so applying a treatment would be better for dry, split ends. And while cat's claw is anti-inflammatory and anticarcinogenic, there's not enough research to show any benefits for hair."
MC EDITORS' VERDICT: Our tester's mane felt thicker and fuller after one week and held up to multiple blowdrying and flat-ironing sessions without drying out. After three weeks, she started noticing new growth along her hairline and received at least one compliment a day about how healthy her hair looked.
BOTTOM LINE: ****1/2