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Vitamin B12

Also called: Cobalamin

Keeps nerves healthy and helps make red blood cells and energy. Absorption drops with age, low stomach acid, some medicines, and autoimmune gastritis.

Supplements can interact with medications and aren't right for everyone, especially during pregnancy or breastfeeding, or with a chronic condition. Ask your provider before you start.

Studied for

  • Low B12 on a blood test
  • Fatigue from B12-deficiency anemia
  • Plant-based diets
  • Long-term metformin or acid-reducing medicine

Found naturally in

  • Meat and fish
  • Eggs
  • Dairy
  • Fortified nutritional yeast
What variations of vitamin B12 exist?Our top pick, what to skip, and how to read the label

Label red flags

  • High-dose B12 started before testing, which can make later blood tests hard to interpret

Check with a provider

  • Numbness, tingling, or balance problems: get tested before starting, since B12 deficiency needs a diagnosis
  • Pernicious anemia needs lifelong treatment and monitoring, not just a supplement

Related conditions

Pernicious anemia

Supplements that contain it

11 products in Dr. Lesher's dispensary list vitamin b12 on the label.

Check with your provider before taking any of these, especially if you're pregnant or take medications.

Parts of the body it affects

Explore what each area does and the conditions that can affect it.

Illustration of blood cells: red blood cells, four kinds of white blood cell, and platelets

Blood & immune system

Blood carries oxygen and nutrients, and white blood cells defend you from infection. In autoimmune disease, that defense system targets your own tissues.

Illustration of the human brain

Brain & nerves

Your brain, spinal cord, and nerves carry every signal in your body, from movement and sensation to mood and memory.

Illustrations: Servier Medical Art, CC BY 4.0

Dr. Lesher, ND

Ready to find the root cause?

Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.

Book a consult now