Clinics charge $50 to $250 per B12 shot. We charge $3 to $4. Buy here.

Vitamin B12 Tests & Deficiency Diagnosis

The Active B12 Test (Holotranscobalamin)

Learn what active-B12 (holoTC, or holotranscobalamin) is, and why we recommend the active-B12 test over the current serum B12 test.