Forget caipirinhas. Girls from Ipanema get a buzz from this shine-enhancing mixture. "Once a week, apply a cocoa butter treatment mask, let it sit for a half hour, then rinse it out with coconut water," says pro Marco Antonio De Biaggi of São Paulo. "The combination leaves hair incredibly soft and moisturized—it's a trick of many Brazilian women."

L'Oréal Série Nature Masque Cacao, $33; us.lorealprofessionnel.com for stores.
Vita Coco coconut water, $31/pack of 12; vitacoco.com.