Wellness Formula is Source Naturals number one selling vitamin and herbal winter supplement. Wellness is uniquely effective because it goes deep to the root cause of body system imbalances. This supports interlocking components of the immune system-mucous membranes, cell-mediated immunity and humoral immunity - and also addresses antioxidant defence, the stress response, and the respiratory system. A mega potency of vitamin C, plus Echinacea, Astragalus, Propolis and garlic, have made Wellness Formula a welcome companion in the cold-weather battle.