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In page Chemistry of ascorbic acid:

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  • Heroin users are known to use ascorbic acid as a means to convert heroin base to a water-soluble salt so that it can be injected.[3]
  • As justified by its reaction with iodine, it is used to negate the effects of iodine tablets in water purification. It reacts with the sterilized water, removing the taste, color, and smell of the iodine. This is why it is often sold as a second set of tablets in most sporting goods stores as Potable Aqua-Neutralizing Tablets, along with the potassium iodide tablets.[citation needed]
  • Intravenous high-dose ascorbate is being used as a chemotherapeutic and biological response modifying agent.[4] It is undergoing clinical trials.[5]