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Some studies have reported a difference between days of over 100 pmol/l Serum B12 concentrations may be influenced by specific changes in our genetic material, our DNA

Juanpablo - it could still be worth finding out what your current B12 reading is , if you can find a medical professional who understands that it should by now be very high

In recent months the use of vitamin B12 injections have been featured in the popular press: The 60p injection that can boost your flagging energy How to get a bikini body like Lea Michele: The Glee star's weightloss secrets revealed

If pregnant or breastfeeding, talk to us first to determine whether the benefits outweigh the risks