Popping pills is encouraged at Kérastase. The company’s new Densitive Daily Anti-Hair Thinning, Anti-Hair Loss Dietary Supplement promises to promote thicker, denser and shinier hair with zinc (which produces keratin) and grape seed polyphenols (known to help nutrients circulate in the scalp). A committed relationship is required, though, as it takes six months to see results. $60; kerastase.com.
Photography by Thomas Iannaccone