I would like some help with why after being on methylcobolamin 1000mg for 2 years and without it helping me feel better, why B12 injections would give me more of a boost in energy for 2 weeks? I have taken 3 injections so far and they are every 3 months. Next one due August 2018. Thank you in advance.
VITAMIN B12 201 (190 - 900)