Power-C Firming & Brightening Serum Caps. Benefits: Helps brighten and firm skin. Decreases the intensity of dark spots and helps protect skin against premature aging. Moisturizes and helps defend skin against free radicals. Key Ingredients: Vitamin C (L-Ascorbic Acid) at 20%. Raspberry Leaf Extract is rich in antioxidant benefits. Research Results: 100% of participants saw an improvement in elasticity, firmness, and reduction in dark spot color intensity.. 97% of subjects saw an improvement in skin radiance.. Based on results in a clinical study of 30 participants, 10 of which had sensitive skin, after 4 weeks of daily use.. 12.5% Increase in Skin Radiance after 8 weeks. Reduced dark spot size by 17.3% and dark spot intensity by 22%.. Based on results in a clinical study of 30 participants, 10 of which had sensitive skin, after 8 weeks of daily use..