Vitamin C as Ascorbic Acid is a nutritional supplement. While fruits like Amla and Guava have this in high quantities, if you prefer to take a tablet upto 1500mg/day is safe.
Recommended Dietary Allowance is 40-120mg/day depending on your age and gender.
Next Steps
General prescription is 500 or 1000mg/day for 28days in case of deficiency.
Health Tips
Try to take natural sources for good nutrition.