How often can i take vitamin c supplement? thank you doctors.

Several: Times a day if you like but it's not recommended . The body actually will excrete out excess vitamin c in the urine. However if you take massive doses of vitamin c for a long time your body can get used to it and abruptly stopping it has been known to cause scurvy

Once a Day: Once a day should be sufficient. Be careful not to take too much Vitamin C (or any vitamin) as there can be toxicity and other complications at too high of a dose (such as kidney stones).

Lets review your que: vitamin C is water-soluble so the amount you take in will not affect you or your health. Daily C is good enough.

Daily: Taking 500mg once daily is good.