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Ann Anim Sci
But for most purposes (like weekly maintenance injections), IM is the preferred route at home because its simpler (the vitamins absorb quickly from muscle into the bloodstream over a few hours)
doi: 10.1186/s12967-020-02374-0 10 MeizlishMLPineABBishaiJDGoshuaGNadelmannERSimonovMet al
