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The reviewer, Ashley, shares her positive experience with the Bio Retinoid Youth Concentrate Oil by REN Clean Skincare. She finds it easy to use, simply applying it to her face after rubbing it in her hands. Ashley believes that this serum brings her skincare routine together and leaves her feeling fresh and glowing when she wakes up. Although she admits to not being consistent with its use yet, she is confident that once she incorporates it into her daily nighttime routine, it will yield even better results. Overall, Ashley rates the Bio Retinoid Youth Concentrate Oil a perfect 10 out of 10, emphasizing its ability to enhance her skin's appearance.