Vitamin C can be taken in different dosage forms including pills, chewable tablets, tablets, granules, effervescent tablets, etc. Different dosage forms are used in different ways, such as taking it by mouth, taking it with water, and so on. 1. Vitamin C pills: This medicine is used for the prevention and treatment of vitamin C deficiency and is usually taken with warm water. 2. Chewable Vitamin C tablets: this drug is mainly used for the prevention of scurvy, or auxiliary treatment of acute and chronic infectious diseases and purpura, need to be chewed and swallowed. 3. Vitamin C tablets: this drug is also used for the prevention of scurvy, or auxiliary treatment of acute and chronic infectious diseases and purpura, warm water. 4. Vitamin C granules: this preparation works in the same way as the tablets and is taken with water. 5. Vitamin C effervescent tablets: the drug can be used to enhance resistance, prevention and treatment of scurvy, but also can be used in the recovery period of the disease, need to be dissolved in cold or warm water and taken. All the above drugs are recommended to be taken under the guidance of a physician.