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b12 cat injection Cyanocobalamin Injection, 1000 mcg/mL 1mL Vial Vitamin B12 Deficiency in Cats:
Description
What Are the Benefits and Risks of Injectable B12
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It absorbs what it needs and simply flushes out any excess through your urine

For animals, B12 oral supplements are not ideal, as it would require taking large quantities for the right amount to be absorbed

On the other hand, if you're taking cyanocobalamin, know that: Cyanocobalamin injections are generally given every day during the first week of your treatment

Medication interactions and timing Avoid changing oral or injectable medicines immediately after a B12 shot without seeking clinical advice