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The 10% Vitamin C + E Ferulic Acid Serum by Timeless Skin Care was reviewed by KKumfy in a video. KKumfy mentioned that they were disappointed with the product, as it was watery and had a strong burnt plastic smell. They decided to return it, giving it a rating of zero out of 10. Despite this negative experience, it's important to note that individual preferences may vary. Some potential benefits of this serum include its high concentration of Vitamin C, which can help brighten and even out the skin tone. However, the watery consistency and unpleasant smell mentioned by KKumfy may be potential drawbacks for some users. It's always recommended to do a patch test before incorporating any new skincare product into your routine.