However, certain groups may be at greater risk for this problem, including: Vegetarians Vegans Older adults People with digestive problems Signs of a B12 deficiency include fatigue, anemia, muscle weakness, nerve problems, mood disturbance, and intestinal problems
What follows is what we know from that review and from the published clinical record
Just make sure to avoid caffeine for at least an hour after taking supplements as it can inhibit efficient absorption of the vitamin
Mohammed, H., Rimondini, L
The following are our recommended vitamin B12 injection needle size and gauge: B12 Shots Needle Size (Length) For subcutaneous B12 injections, we suggest using shorter 4-5mm needles