Li Z, Wang F, Liang B, Su Y, Sun S, Xia S, Shao J, Zhang Z, Hong M, Zhang F, Zheng S
While oral supplements are available, B12 injections offer better absorption, especially for those with gastrointestinal issues or poor nutrient absorption
In life-threatening cases, 5,000,000mcg of B12 is given directly to the veins within a 15 minute window
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Source quality: where is the B12 coming from
You can use them on injection areas with enough layers of subcutaneous fat, such as the abdomen or thigh