Our expert says:
Dear Very concerned - high doses of Vit C ( 1000 mg per day) could be risky but not the rest. The reason contraceptives fail when you are on antibiotics is because we use very low doses of hormone and it needs to be absorbed, go through the liver and be excreted in the deodenum and re-absorbed. Antibiotics, some drugs and having diarrhoea interferes with this "second" absorbtion and make the pill less effective. Just remember if you are training very hard that your menstruations can become irregular!
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