PMC4309343_01
Serum vitamin B12 levels after total gastrectomy. After total gastrectomy,
the basal serum vitamin B12 level was initially maintained within the
normal range by intramuscular injections of mecobalamin (Methycobal ). Nine
months after surgery, the serum vitamin B12 level suddenly increased to
33,000 pg/ml and remained persistently elevated for approximately one year without
injections of mecobalamin. During that time, the patient consumed half a bottle of an
energy drink each day as a supplement. After discontinuing the drink, the serum
vitamin B12 concentration declined to within the normal range.
jrm-8-181-g001.jpg
PMC4309343_01_jrm-8-181-g001.jpg
fig_001
After he discontinued the energy drink, his serum vitamin B12 levels quickly declined to within the normal range (Figure 1).