b12 injections vs oral supplements Vitamin vs. Supplements: Which is Right for You? B12 Injections vs. Supplements –
Description
These can include redness at the injection site, mild nausea, or a feeling of warmth

Li G, Kong B, Tong Q, Li Y, Chen L, Zeng J, Yu H, Xie X, Zhang J (2021b) Vanillin downregulates NNMT and attenuates NNMT-related resistance to 5-fluorouracil via ROS-induced cell apoptosis in colorectal cancer cells
Taken orally

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