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An individual is either not getting enough vitamin b12 from their diet or they are unable to absorb vitamin b12 from their diet
There are some animal studies that show it might be possible, but scientists aren't sure yet
Serum B12 alone can sometimes be misleading MMA levels provide a more functional assessment of whether your body is actually utilizing the B12 available to it
Ayala-Aguilera CC, Valero T, et al
![Vitamin B12 (5,000 mcg/ml) [100 mL]](https://www.armoranimalhealth.com/media/webp_image/catalog/product/cache/207e23213cf636ccdef205098cf3c8a3/_/v/_v_i_vitamin_b12_5000_mcg_1_.webp)
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