b12 injection 100 pets by henry schein Vitamin (Generic) Injectable Solution for Pets, 100-ml (1000mcg/ml), (Manufacturer may vary) skin and coat problems 003125 - Henry Schein Medical

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Each injection remains 3.2 mg while frequency falls

Vitamin B12 can interact with medications such as colchicine (a medicine used to treat gout), metformin (an anti-diabetic agent), excessive alcohol, vitamin C products, extended release potassium products, antibiotics such as gentamicin, neomycin, tobramycin, anti-seizure medications such as phenobarbital, phenytoin, primidone, medicines used to treat heartburn like H2 blockers such as cimetidine and proton pump inhibitors such as omeprazole, antacids such as ranitidine, cimetidine

And if you do have a condition that significantly inhibits your ability to absorb B12, like pernicious anemia, you likely need injected B12 supplements

Those who did not track intake lost 0.3%