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10.1038/emm.2016.49 310 YeM.ChungH.-S.LeeC.YoonM

I would like to see rigorous clinical trials before approval

Possible adverse effects may include: Injection site reactions : Redness, swelling, irritation, or discomfort Gastrointestinal symptoms : Nausea, vomiting, stomach cramps, or diarrhea Headaches or dizziness Allergic reactions : Rash, itching, shortness of breath, or facial swelling (rare) Increased heart rate or anxiety (typically temporary from B-vitamins) Fatigue or weakness if used improperly Elevated liver enzymes when taken in excess particularly with methionine or choline Insomnia if taken late in the day due to increased energy levels Who should avoid or use caution

doi:10.18433/J3PK7P

This means that if your cat has FIP, his B12 reserves can be depleted rather quickly