Anything can kill you in high enough doses. For instance, if a case of vitamin c tablets fell on you, you could say that vitamin c kills you. You would be ill-advised to take such a high, 20 megagram dose. Vitamin c kills sperm acidity kills the sperms sucioent.com sperms need an environment how to use vitamin c as emergency contraception which is more alkaline than sucioent.comn c increases the acidity vitamin vitamin c oral contraceptives c kills . Vitamin C also know as Ascorbic acid can be used in a variety of ways to prevent conception. Of course the best prevention is to keep the sperm out of the vagina in.