This $15 vitamin C serum sells every 4 minutes, so I tried it to see what all the fuss is about

Priced at just $17, a bottle of InstaNatural vitamin C serum sells every four minutes on Amazon. It's plant-based power must be experienced firsthand.

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Photo: <a href="http://www.stocksy.com" target="_blank" rel="noopener noreferrer">Stocksy</a>/Leandro Crespi