How much Vitamin C is required?

I finished my vitamin C (left image) just a couple of days ago and I haven't purchased a new one yet as I am contemplating on how much vitamin C I should take everyday. I think I have an idea now based on this article I found in the web.

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There is a large amount of difference of opinion on the Recommended Daily Allowance of Vitamin C.

The RDA in the United States is a minimum of 40 mg a day for men, and 30 mg a day for women, and that smokers require as much as 100 mg. However, many doctors and nutritionists are suggesting that the most advantageous amount is a minimum of 200 mg daily. An exhaustive review to determine how much Vitamin C is required was published in the Journal of the American Medical Association concluded that doctors should counsel patients to avoid regular daily doses of over 1 gram, or 1000 mg.If you are Vitamin C deficient, the biggest risk is scurvy. Scurvy in this day and age is very uncommon, and you would have to virtually consume no Vitamin C at all to be at risk. Deficiencies of this Vitamin however are linked to shorter lifespans and a greater risk for heart problems. Toxicity or overdose of Vitamin C is not fatal, but will cause uncomfortable effects such as bloating, gas, and diarrhea. These effects can be treated as quickly as onset occurs by simply decreasing your supplement dosage. Further, if levels are too high, you run the risk of interfering with copper absorption, so if you are taking high levels of Vitamin C, ensure you are getting adequate supplementation of this mineral elsewhere.

For optimum health, a good dosage guideline is 500 mg a day from the diet and/or supplementation. Because of its antioxidant effects, Vitamin C is very effective when consumed with other vitamins that have antioxidant properties like Vitamin E.