Whether in a serum, mask or cream, no other active ingredient will conjure a more beautiful glow than vitamin C. The ultra-strong antioxidant that keeps free radicals at bay helps with numerous skin problems, such as hyperpigmentation and bumps, but it also boosts collagen synthesis and protects the skin from irritation, inflammation and environmental pollution. Of all forms of vitamin C, L-ascorbic acid is the best-researched and most effective for the skin. Start at a concentration of 5-10 percent and gradually increase up to 20 percent. The active ingredient that will benefit truly every skin type is particularly sensitive to light and heat - store it in a dark and cool place!
