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Manvitha shares her experience with the Retinol Renewing Serum by Karyng in her video review. She mentions that after using the niacinamide from The Ordinary as her first step, she applies this retinol serum. She received this product for free from Flip as part of a promotion. Manvitha is impressed with the quantity of the serum and loves its amazing scent. She notices an immediate glow after applying just one pump and typically uses two pumps due to her thirsty skin. The serum works perfectly for her moisturizing needs. She encourages viewers to try it and share their feedback in the comments. Overall, Manvitha's review highlights the serum's effectiveness in providing hydration and a radiant complexion.