When you inject water, the body has to equalize the salinity, and that shift can cause the stinging pain from B12 injections based on water
The main reason that a doctor would prescribe vitamin B12 injections is if the patient is unable to obtain enough vitamin B12 on their own, whether they have pernicious anemia or are unable to get enough of the vitamin through their diet alone
Mild to moderate deficiencies of vitamin B12 are fairly common, with about 40% of people in Western populations reported to experience them [1]
Broadly speaking, B12 injections give the body further resources to produce more red blood cells to carry larger amounts of oxygen throughout the body, meaning those who receive such treatments can benefit from increased energy and reduced feelings of fatigue
Each route has different absorption and research limitations
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