Where can you buy redoxon?

I'll try to answer your question and save you some money at the same time. Redoxon is simply an effervescent form of ascorbic acid (vitamin C). I have read very few articles to indicate any advantage of one form of vitamin C over another, except to increase profit to the manufacturer. You might be surprised to learn that only a handful of manufacturers make the bulk vitamin C powder and/or tabs, then re-sell them to other companies to repackage under dozens or names. Save your money for a more worthwhile supplement.