New Summer Beauty Products

TOSS Dried-out bottles of purple or navy polish—get your nails out of the Dark Ages.
TRY Sand- and seashell-inspired hues, which give fingers a breath of fresh air.
BUY Barielle Shades nail polish in Skinny Dip ($8), Avon Speed Dry Nail Enamel in Sheer Chiffon ($4), CND nail polish in Cocoa ($6), and Sally Hansen Insta-Dri Fast Dry Nail Color in Petal Pusher ($4.95).

BUY Goody Resort Glamour Kingston Bobby Slides ($3.49 for six), which add a bright, whimsical twist to poolside ponytails.

TRY Bliss Body Butter Lite ($35). It's half as thick as traditional shea-butter formulas but still provides heavy-duty moisture that's perfect for sun-parched legs.

BEAUTY BREAKTHROUGH: GRAY'S ANATOMY
Stress-induced gray hair has always been brushed off as an old wives' tale (even President Obama's new silvery strands have been attributed to his genetic makeup, not the pressure of his high-anxiety job). But recent research from the U.K.'s Bradford University shows that oxidative stress can cause excess hydrogen-peroxide buildup in the hair bulb, which bleaches strands as they grow out of the scalp.

How to stave off silver? Biolage Rejuvathérapie Age Rejuvenating Intensive Masque ($20) and Joico Re:nu Age Defy Re:nual Serum ($40) are packed with anti-inflammatory ingredients like ginseng, hops, and lycopene, which combat oxidative stress and may prevent (and reverse) premature graying.