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28. Product Recommendation: TruSkin Naturals Vitamin C Serum
With more than 8,000 five-star reviews, this serum works. And bonus: It has vitamin C and hyaluronic acid,which are two of the most important ingredients when boosting collagen and slowing down wrinkles. 

Buy at Amazon: TruSkin Naturals Vitamin C Serum, $19.99, Amazon