b12 injection for humans Vitamin at a Licensed Pharmacy Methylcobalamin Injection (Vitamin B12) |

There are different types of B12 supplements, and they dont all affect your kidneys the same way

Similarly, the quinolinium containing parent analogue 1-MQ also lacked passive diffusion properties (Table 4), suggesting that the lipophilicity and drug-like permeability properties of analogues within the methylquinolinium series had to be improved via chemical modification

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Chapman LE, Darling AL, Brown JE (2015) The association between the biguanide drug metformin and vitamin B 12 deficiency in diabetic patients: a systematic review

For mild, diet-related low levels, tablets can be equally effective