Dr. Sheetal on Instagram: "Many people use Vitamin C daily but still struggle with dullness and uneven skin tone. One common reason is poor absorption. @thedermacoindia The Derma Co 10% Vitamin C Serum is designed with a Deep Penetration Formula (DPF) to enhance the delivery of Vitamin C into the skin. Improved penetration helps the ingredient perform its brightening and antioxidant functions more effectively. For best results, apply on clean skin, follow with a moisturizer, and use sunscreen du