Powdered collagen and collagen shots (and waters) have exploded in popularity over the last few years. You've probably heard all about how collagen supplements can help promote hair growth , improve joint health, and prevent skin from aging. Admittedly, I'm a convert. I use the Vital Proteins Unflavored Collagen Peptides ($20, originally $25), which are on sale today, almost daily. I love the...

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