Hello. My dentist advised me to takr vitamin C...

Dear Customer
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Dear customer :

vitamin C suppliment is a medication that make your immunity system strong or weak directly . so it may be not related to cause your sickness , and we will give you some advices beside answering your question 

What is the proper dose for vitamin C suppliment ?

usually 1 pill daily is recommanded unless you start having side effects from taking this suppliments 

What is the next step ?

1. consult your internal medicine doctor 
2. dont depend only on suppliments , healthy and regular food is imporatant and main booster to your immunity system
3. exercsise more and have a plenty of rest 
4. usually suppliments recommanded doses are : 1 pill daily 
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Kind Regards