All Supplements
L-Glutamine vs Vitamin B12
Side-by-side comparison — benefits, dosage, forms, and research.
Feature
L-Glutamine
Vitamin B12
Typical Dosage
5-10g daily
500-1,000mcg daily
Best Form
L-Glutamine powder
Methylcobalamin
Key Benefits
5
5
Evidence Rating
★★★
★★★★
Best Time
Post-workout or divided throughout the day with meals
Morning — may be energising
L-Glutamine Benefits
✓Supports intestinal barrier integrity
✓Enhances immune cell function
✓Promotes muscle recovery and protein synthesis
✓May improve gut health and reduce leaky gut
✓Supports nitrogen balance during catabolic states
Vitamin B12 Benefits
✓Energy production
✓Nerve function and protection
✓Red blood cell formation
✓DNA synthesis
✓May reduce homocysteine levels
Can You Take Both Together?
In most cases, L-Glutamine and Vitamin B12 can be taken together safely. However, always check the interactions section of each supplement and consult a healthcare professional if you take medication.
Which Should You Choose?
Choose L-Glutamine if your primary goal is: supports intestinal barrier integrity. Choose Vitamin B12 if your primary goal is: energy production. Many people take both as they target different aspects of health.
Disclaimer: This comparison is for educational purposes only. Always consult a healthcare professional before starting any supplement.