Preservative: This is used as a preservative for some vaccines.
Answered 8/27/2012
5.6k views
? main ingredient ?: The main ingredient in any vaccine is the protein combination that is designed to help your body create antibodies.Any such product has a defined usable life.Like an apple, it must be picked,shipped sold and ready to be used but it is unusable after a defined amount of time.Vaccine makers use non-toxic trace amounts of this and other agents to extend the usable life.
Answered 8/20/2016
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