what does b12 injection do for cats How-To: Giving Subcutaneous (SQ) Vitamin Vitamin B-12 1000mcg - Injection
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References 1.The IASP Subcommittee on Taxonomy Pain terms a list with definitions and notes on usage

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People with certain health conditions : Those with conditions like pernicious anemia, which affects the absorption of B12, can benefit from regular B12 injections

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I don't have a current plan other than to just wait it out and to get my b12 tested every couple of weeks to see if/how much its decreasing