Insulin syringe Medical practitioners base their decision on what syringe size to use based on the patients insulin requirement, the concentration of the insulin to be used, and the preference of the insulin administrator based on his previous experiences

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Im thinking, if you go too long without B12, or for whatever reason that month through stress/illness whatever you use up your B12 more quickly, when you do have your injection that your potassium could drop as your body goes through a healing process, similar to when you first go on it
Possible Side Effects Injection site pain or redness Mild and temporary
Elfayoumy, A.M
If you have a B-12 deficiency, it can be more challenging to lose weight, and you might feel sluggish or tired, so B-12 injections can help boost your energy and metabolism.