B12 deficiency
Vitamin B12 deficiency
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When your body isn't getting or absorbing enough vitamin B12, which it needs for healthy blood and nerves. It's more likely with a vegan diet, some gut and autoimmune conditions, and certain medicines like metformin.
You might notice
- feeling really tired or low on energy
- pins and needles or numbness
- a sore, red tongue or mouth ulcers
- trouble concentrating or remembering
- changes in mood
- muscle weakness
Who can help
- Dr. Hannah Moore · Naturopathic Doctor (ND)Also works with fatigueProfile →
- Dr. Rachel Alioto · Naturopathic Doctor (ND)Also works with fatigueProfile →
- Dr. Megan Ross · Naturopathic Doctor (ND) · Functional Medicine PractitionerAlso works with fatigueProfile →
Start with a doctor who will test and look at the whole picture, like an integrative MD or a naturopathic doctor.
See everyone for fatigue →
Where it can overlap
- Fatigue
B12 deficiency can overlap with fatigue. Established
- Brain fog
B12 deficiency can overlap with brain fog. Established
- SIBO
B12 deficiency can overlap with SIBO. Associated
- Iron deficiency
B12 deficiency is often looked at alongside iron deficiency. Woo exploration
1 more threads +Fewer threads −
- Blood sugar
B12 deficiency is linked with metformin, a common medicine for blood sugar. Established
Established: well documented · Associated: linked, not a cause · Emerging: early research · Woo exploration: worth exploring, not yet sourced. A link isn't a cause.
Keep exploring
5 sources · how we checked
Everything on this page was researched from clinical guidance, government health sources and published reviews first, then single studies. Where a connection is only worth exploring, it says so.
- SIBO (Small Intestinal Bacterial Overgrowth) Cleveland Clinic · 2024 · Academic medical centre
- Vitamin B12 deficiency in over 16s: diagnosis and management (NICE guideline NG239) National Institute for Health and Care Excellence (NICE), via NCBI Bookshelf · 2024 · Clinical guideline
- Vitamin B12 or folate deficiency anaemia NHS (UK National Health Service) · 2023 · Government health source
- Pernicious Anemia (StatPearls) StatPearls Publishing, NCBI Bookshelf (NIH/NLM) · 2023 · Peer-reviewed paper
- Vitamin B12 Deficiency (StatPearls) StatPearls Publishing, NCBI Bookshelf (NIH/NLM) · 2024 · Peer-reviewed paper
A note from Woo: Body Map is here to help you explore and ask better questions. It isn't a diagnostic tool or a substitute for medical care. Relationships shown here represent areas that may be associated or worth exploring, not a diagnosis or statement of cause.
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