what b12 injections used for Are Vitamin Shots Right You? The Power of B12 Injections:

I would definitely recommend this product

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I also have fibromyalgia so it is really hard to figure what is causing what with me. I really would like to know if B12 at 4000 can be harmful or be a sign of something being wrong

That's why it's important to let your doctor know if you have any of the following conditions before you're prescribed hydroxocobalamin: If you've had an allergic reaction to hydroxocobalamin or any other medicines in the past If you've been diagnosed with low levels of potassium If you have an irregular or fast heartbeat Once you've started taking hydroxocobalamin, you may have some side effects such as pain, swelling, or itchy skin at the point where the syringe was injected

And they have no known pharmacological interactions

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