/WHAT_IT_IS
Vitamin B12 is essential for red blood cell production and nerve function. Deficiency causes macrocytic anemia and peripheral neuropathy.
/NORMAL_RANGE
Reference: 200–900 pg/mL. Optimal: >500. Symptoms can appear with levels <300 even within "normal" range.
What does high B12 mean?
- +Supplementation. Rarely concerning.
What does low B12 mean?
- +Vegan/vegetarian diet, pernicious anemia, metformin use, chronic PPI use.
/ON_TRT
Not directly affected. Low B12 can mimic fatigue symptoms and is worth ruling out if you don't feel optimal despite good TRT labs.
/RELATED
/TRACK_THIS
Track B12 in the app.
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