Nourish your immune system with our unique Ester-C®, a gentle, non-acidic form of Vitamin C.** Vitamin C is an antioxidant vitamin that is important for the functioning of white blood cells, which are vital components of the immune system.** Vitamin C supports healthy immune function and promotes our overall well-being.** While many animals naturally produce this essential vitamin, humans cannot. That’s why it’s important to get our Vitamin C from citrus fruits, certain vegetables, and supplements. Beyond potent antioxidant support and immune support, Ester-C also supports upper respiratory and heart health.**  What’s more, this formulation includes Vitamin D, which further helps maintain a healthy immune system.** If you’re looking for 24-hour immune support that’s gentle and easy to take, Ester-C is the choice for you.