Collagen brand Vital Proteins has launched a flavored spin on its best-selling collagen peptides—a new Chocolate flavor available exclusively in-stores and online at Costco.   The new Chocolate Collagen Peptides flavor contains no added sugar, is made with natural cocoa and  20g of collagen peptides to help support healthy skin, nails, hair and joints with quality ingredients. The added flavor boost from cocoa powder is a great way to mix up a collagen routine with chocolate collagen smoothies, ...