Customers find this vitamin C serum effective, noting visible results after a week of use and improvements in skin tone, with one customer mentioning it helped lighten dark spots. The product receives positive feedback for its value, with one customer comparing it favorably to Skinceuticals, and customers report their skin appears brighter and refreshed. However, the product has several drawbacks: it has a weird smell, turns noticeably yellow in color, and oxidizes too quickly.

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