Vitamin C is the most widely taken nutritional supplement and is available in a variety of forms, including tablets, drink mixes, crystals in capsules or naked crystals.
Tablet and capsule sizes range from 25 mg to 1500 mg. Vitamin C (as ascorbic acid) crystals are typically available in bottles containing 300 g to 1 kg of powder (a teaspoon of vitamin C crystals equals 5,000 mg).
If you want to go through the natural route.
Natural sources of Vitamin C.
Foods containing vitamin C
Vitamin C is found in a wide variety of fruits and vegetables, including citrus fruits, dark leafy greens, broccoli, tomatoes, potatoes, liver products, and oysters.