lower back pain after b12 injection Do Injections Hurt? Painful Shots Tips · PA Relief Why Do I Feel Worse
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Retrieved from Yoshida, Y., Sumikawa, M., Sugimori, H., & Yano, R

If your stomach is not producing enough stomach acid then you will have a problem not only with the digestion of your food but also with the absorption of certain nutrients, chiefly vitamin B12
Dr Andrew Thornber, chief medical of Now Patient told Express.co.uk its rare to overdose on vitamin B12, but it can occur if too much has been taken

But the risk might differ between them