25grams Vitamin C Injections

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I need to buy vitamin C injections for a cancer patient who is taking buffered vitamin C orally but the condition does not seem to improve. Need vitamin C in injectible form. All I can get on the internet is vitamin C injections of 500mg in 5ml ampules. I need high potency injections, something like 20gm to 25gm per injection. Also if anyone can tell me how to administer vitamin C IV injectios. Thanks Junaid Khan