Name a popular antioxidant used in skincare products.

Vitamin C is a widely recognized and popular antioxidant used in skincare products due to its numerous benefits for the skin. As an antioxidant, it plays a crucial role in neutralizing free radicals, which can cause premature aging and skin damage. Vitamin C is also essential for the synthesis of collagen, a vital protein that helps maintain the skin's structure and firmness. Its brightening properties help to even out skin tone and reduce the appearance of dark spots, making it a favorite among those looking to enhance their complexion.

In addition to these benefits, Vitamin C can stimulate skin repair and provide protection from environmental stressors like UV radiation and pollution. Many formulations combine Vitamin C with other ingredients to enhance its stability and effectiveness in combating oxidative stress, further contributing to its popularity in the skincare market.