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does b12 injection cause diarrhea in cats Vitamin for Cats: Overview, Dosage & Side Effects Help with Kitty diarrhea :
Description
We therefore measured the systemic bioavailability of antidotes for organophosphorus nerve agent and cyanide poisoning when administered by the intraosseous, intravenous, and intramuscular routes in a small study of Gttingen minipigs

Most people can not sense a possible vitamin b12 deficiency

O2 saturation is fine but it hurts to breathe in

Severe deficiency : Weekly or biweekly injections may initially be required to correct anemia and neurological symptoms

Journal of the National Comprehensive Cancer Network: JNCCN