A
B12 level of 162 pg/mL is on the lower side for most labs, where the normal range usually starts closer to 200. At this stage it can cause tiredness, pins and needles in your hands or feet, trouble concentrating, or low mood, even before blood counts change.
Next Steps
Vitamin B12 supplementation usually helps, and whether tablets or injections suit you better, along with how long you'd need them, depends on how low your stores actually are and how you absorb the vitamin. Please see a general physician to decide the right form and duration for you.
Health Tips
Get your levels rechecked after a few months of treatment to confirm they're improving.