Does Vitamin B12 Cause Gas Symptoms?
Know if vitamin B12 can cause gas, how to reduce the gas formed from B12 and more.
Written by Dr. Shaik Abdul Kalam
Reviewed by Dr. Mohammed Kamran MBBS, FIDM
Last updated on 3rd Aug, 2025
Introduction
If you’ve ever experienced gas, bloating, or discomfort after taking a vitamin B12 supplement, you might wonder if the two are related. While vitamin B12 is essential for energy, nerve function, and red blood cell production, some people report digestive issues like gas after taking it. Let’s explore whether vitamin B12 can cause gas symptoms and what you can do about it.
Understanding Vitamin B12
Vitamin B12, also known as cobalamin, is a water-soluble vitamin that plays a crucial role in:
Supporting nerve health
Producing red blood cells
Boosting energy levels
Maintaining brain function
Since our bodies don’t produce vitamin B12 naturally, we must get it from food (like meat, fish, dairy, and fortified cereals) or supplements.
Can Vitamin B12 Cause Gas?
While vitamin B12 itself doesn’t directly cause gas, some factors related to its intake might contribute to digestive discomfort:
1. Form of Supplement
Oral Supplements (Pills & Tablets): Some people experience mild bloating or gas due to fillers, binders, or artificial ingredients in supplements.
Sublingual (Under-the-Tongue) B12: This form bypasses the stomach, reducing the chance of digestive issues.
Injections: If digestive problems persist, B12 injections may be a better option.
2. High Doses
Taking very high doses of B12 (especially in supplement form) can sometimes upset the stomach, leading to bloating or gas.
3. Underlying Digestive Issues
People with digestive disorders like IBS (Irritable Bowel Syndrome), Crohn’s disease, or celiac disease may be more sensitive to supplements and experience gas as a side effect.
4. Lactose or Additives
Some B12 supplements contain lactose (in chewable tablets) or artificial sweeteners, which can cause gas in sensitive individuals.
Consult Top Specialists for Personalised Tips
How to Reduce Gas from Vitamin B12
If you suspect your B12 supplement is causing gas, try these tips:
Switch the Supplement Form
Change the form of supplements
Try sublingual B12 (dissolves under the tongue).
Opt for methylcobalamin, a natural form of B12, instead of cyanocobalamin synthetic form.
Consider B12 injections if oral supplements cause discomfort.
Check for Additives
Choose clean-label supplements without artificial fillers or lactose.
Look for vegan or hypoallergenic options if you have sensitivities.
Take with Food
Taking B12 with a meal can help reduce stomach irritation.
Stay Hydrated
Drinking enough water helps digestion and may reduce bloating.
Rule Out Other Causes
If gas persists, consider whether other factors (like diet, lactose intolerance, or gut health issues) may be contributing.
When to See a Doctor
While mild gas from B12 supplements is usually harmless, consult a doctor if you experience:
Severe bloating or pain
Diarrhoea or constipation
Signs of an allergic reaction (rash, swelling, difficulty breathing)
Final Thoughts
Vitamin B12 itself doesn’t directly cause gas, but certain supplement forms, additives, or high doses might contribute to bloating. If you’re experiencing discomfort, try switching supplement types or consulting a healthcare provider for guidance. Remember, B12 is vital for health, so don’t stop taking it without professional advice!
Consult Top Nutritionists
Consult Top Specialists for Personalised Tips
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Consult Top Nutritionists
Dr. Ramalinga Reddy
General Physician
5 Years • MBBS MD General medicine
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Bhukya Pavan Kalyan
General Physician
5 Years • MBBS DNB Paediatrics
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Mrs Sneha P V
Nutritionist
10 Years • Master of science in Food and Nutrition
Bengaluru
Apollo Clinic, Sarjapur Road, Bengaluru
Dt. Ila Sharma
Clinical Nutritionist
18 Years • Master in food & Nutrition
Gurugram
VIPUL GREENS - SOCIETY CLINIC, Gurugram
Dr Sumanth R
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
