b complex liver extract with vitamin b12 injection Belamyl - 100ml Contains 100mg per mL of both Thiamine (B1) and Niacin. VETOMIL Vitamin B-Complex with Liver

And there are plenty of ways to include more B12 into your meals if youre vegetarian

And unlike nutrients like vitamin C, B12 is found naturally almost entirely in animal foods

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And yes, you have to stick it in your cat

Your physician first would do a blood test on you to determine the level of B12 in the blood