效果一样，as ascorbic acid就是抗坏血酸形式存在的VC的意思，并不否认其他形式的存在

https://en.wikipedia.org/wiki/Vitamin_C Vitamin C is an essential nutrient for certain animals including humans. The term vitamin C encompasses several vitamers that have vitamin C activity in animals. Ascorbate salts such as sodium ascorbate and calcium ascorbate are used in some dietary supplements. These release ascorbate upon digestion.