Vitamin C - Vitamin C, an essential nutrient, plays a crucial role in maintaining a healthy immune system. It acts as a potent antioxidant, protecting cells from damage caused by free radicals. This vitamin is vital for various cellular functions, including the growth and repair of tissues, and it supports the production of collagen, which is necessary for the skin, ligaments, and blood vessels. Furthermore, Vitamin C enhances the activity of white blood cells, which are essential for fighting infections. Regular intake of Vitamin C can reduce the duration and severity of respiratory infections and other illnesses, making it a staple in immune support formulations like HP9 Guard.