Promotes natural immunity and cardiovascular health Offers antioxidant support Contains 1 000mg of vitamin C per serving Free of gluten dairy soy nuts salt preservatives and artificial colors or flavors The Vitamin Shoppe? brand Buffered C-Complex Powder is the seamless solution to priming your body with free radical-fighting antioxidants and essential immune and cardiovascular support. Not only does this powder blend effortlessly with liquid it s also formulated with calcium making them easier on the GI tract. Frequently Asked Questions What does buffered mean? Vitamin C?AKA ascorbic acid?is just that: acidic. When something is highly acidic it can cause stomach discomfort. Added calcium reduces or buffers the natural acidity of vitamin C making it a little gentler on your GI tract.