Reviewed by Dr. Ben Ng, Chief Medical Officer & Weight Loss Program Director

The Role of Vitamin B12 in Metabolism

Vitamin B12 is essential for breaking down fats and proteins for energy. A deficiency can cause:

• Fatigue and weakness, making it harder to stay active.
• Slow metabolism, which may contribute to weight gain.
• Neurological issues, affecting mood and motivation for exercise.

Can B12 Supplements Help With Weight Loss?

There is no conclusive evidence that B12 injections or supplements directly cause weight loss. However, they may be beneficial for those with a deficiency, particularly vegetarians, older adults, or individuals with absorption issues.

Who Might Need B12 Supplementation?

• Vegans and vegetarians: B12 is primarily found in animal products.
• Older adults: Aging can reduce the body’s ability to absorb B12.
• People with digestive disorders: Conditions like gastritis, celiac disease, or Crohn’s disease may impair absorption.
• Individuals taking certain medications: Metformin (for diabetes) and proton pump inhibitors (for acid reflux) can interfere with B12 absorption.

Key Takeaways

While Vitamin B12 is essential for energy and metabolism, it is not a magic solution for weight loss. Ensuring adequate B12 levels can support overall health, energy levels, and physical activity, which are important for maintaining a healthy weight.

Sources

1. National Institutes of Health, "Vitamin B12 and Metabolism" https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
2. Journal of Nutrition, "The Role of B12 in Energy Production" https://academic.oup.com/jn/article/142/5/881/4750077
3. Singapore Ministry of Health, "Nutritional Guidelines for Metabolic Health" https://www.moh.gov.sg/docs/librariesprovider4/default-document-library/nutritional-guidelines.pdf