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But it supports essential functions of your cat's immune system

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If you are concerned about your vitamin b12 levels or have any of the symptoms which could suggest that you might be deficient in vitamin b12, you can ask your doctor for a blood test to check your vitamin b12 levels Vitamin b12 blood tests are also offered by private labs and clinics

(More information) The long-term use of certain medications, such as inhibitors of stomach acid secretion and the anti-diabetes drug, metformin, can adversely affect vitamin B 12 absorption