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The Redefining Serum by HydroPeptide has received high praise from reviewer bridget. She mentions that she loves using this serum on nights when she's not using her tretinoin, as it leaves her skin looking nice. bridget also notes that the serum has a pleasant tingling effect, which she describes as minty rather than painful. Additionally, she enjoys the spa-like scent of the serum. Overall, bridget is really enjoying the Redefining Serum and recommends it for its positive effects on her skin.