Most of the isolated and/or synthetic vitamin C consumed is unused by the body. Whats worse, it puts a negative strain on your liver and kidneys to excrete it, and it is quite acid forming in the body! If a vitamin C is an ingredient of a product, it is synthetic and/or isolated. If it is naturally contained in the ingredient(s), it is naturally occurring (as it is in our product)! Ascorbic Acid and Calcium Ascorbate are synthetic/isolated forms of Vitamin C. "Ester-C" has a few elements added back to an isolated vitamin C molecule and is therefore more absorbable than Ascorbic Acid or Calcium Ascorbate. However, Truly Natural Vitamin CTM has all of the naturally occurring elements synergistically present and bonded (including naturally occurring bioflavonoids) because it is 100% food (100% Acerola Cherry Powder). Other products sometimes give the illusion of being totally or partially whole food products, but in reality, they actually are not! There are many "Vitamin C with rose hips and acerola" type products out there. Every one of those products we have seen has a very small amount of rose hips and/or acerola with a whopping amount of synthetic and/or isolated Vitamin C! Vitamin C mixed with whole foods is not the same as vitamin C contained in whole foods. The superfoods added "on the side" are good for you, but not the main ingredients or the supplement as a whole! Get your Vitamin C the way nature truly intended!