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Risks and Side Effects While generally safe, vitamin B12 injections can have side effects or risks, such as: Mild pain, swelling, or redness at the injection site Dizziness, headache, or nausea Allergic reactions (rare) Hypokalemia (low potassium levels) in individuals with severe deficiency undergoing treatment People with allergies to cobalt or who have Lebers disease should avoid B12 injections unless specifically advised by a doctor
Pharmacological Reviews, 59(2), 151184
it takes about a month to be noticeable but makes a difference in how my body has reacted with the gym Gives me quick energy Love this stuff
This dose is given daily for the first week to quickly fill up body stores
For individuals needing only B12 replenishment, shots deliver strong value
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