Skingoo's Stem Cell Serum with Vitamin C and B3 is praised for delivering visible results in improving skin texture, reducing fine lines and dark spots, and providing hydration. Many users report seeing a noticeable difference in smoothness, radiance, and firm...Skingoo's Stem Cell Serum with Vitamin C and B3 is praised for delivering visible results in improving skin texture, reducing fine lines and dark spots, and providing hydration. Many users report seeing a noticeable difference in smoothness, radiance, and firmness within weeks of using the serum. The lightweight formula absorbs easily without leaving a greasy residue. Some find the citrus scent pleasant. However, a few users mention irritation, breakouts, or no visible effects. Overall, the serum receives overwhelmingly positive reviews for boosting skin quality and youthful appearance.