Hello Dr. Simmons,

The daily recommended Vitamin C is 80mg but the drugs sold is 500 or even 1000 mg , why do they have such dosage? I as a somewhat normal person should take how  much mg? I personally have a habit to take this as I assume it gives energy plus that I exercise a lot.




You are correct, there is no real clinical benefit from taking significantly larger doses of Vitamin C than normally required for effective metabolism. The body actually limits its intake of the vitamin, so an excess dose is largely not absorbed.

From a commercial perspective, marketing health through sales or addition of vitamins is usually successful, so companies will be happy to take this route if it gives them better overall sales, with the added reassurance that they are unlikely to cause harm

I hope this helps.


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Nigel Simmons


I am happy to answer general questions on medicines and hospital care. If possible, please use approved / chemical names rather than brands which are not internationally recognised. Like all health professionals I am bound by a duty of care which prevents me giving detailed information about medication or treatment of people other than the questioner. I will endeavour to help wherever possible or point towards more appropriate advice. If however your question crosses too far into patient confidentiality, I hope you will understand why I cannot answer your question. Consider.. would you want me to discuss your care with a friend or relative without your knowledge?


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