can cat get b12 injection injections in kitten! : r/CatAdvice Vitamin B12 for Cats: Recognising
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How long does it take to see results from San Diego MIC B12 Lipo Shots
Final DMSO concentration in cell culture should not exceed 0.1% to avoid cytotoxicity

2015 Jan "Vitamin B12 - Health Professional Fact Sheet"

After reconstitution, the solution requires refrigeration at 2-8C
Rotating sites may reduce irritation when multiple injections are needed