Hart-Sport Vitamin C effervescent tablet A fresh orange-flavored vitamin C preparation to support immunity and reduce fatigue.* Vitamin C promotes the normal function of the immune system, helps protect cells from oxidative stress and supports the body's ability to cope with busy everyday life. An easy and refreshing way to ensure your daily vitamin C intake - just dissolve in water and enjoy! Vitamin C promotes the normal function of the immune system and helps reduce tiredness and fatigue.