Vitamin B12 for Plant-Based Diets
Use a reliable B12 source or clinician-guided supplement strategy if you eat little or no animal food.
Dosage & Timing
Evidence Strength
4/5 — StrongVegetarian and vegan users have elevated B12 deficiency risk without fortified foods or supplements.
Overview
Use a reliable B12 source or clinician-guided supplement strategy if you eat little or no animal food.
How To Do It
Step 1
Confirm whether your diet includes reliable B12-fortified foods.
Step 2
Choose a consistent supplement or fortified-food plan.
Step 3
Discuss testing if you have fatigue, neuropathy symptoms, or long-term plant-based intake.
Step 4
Recheck status based on clinician guidance.
The Evidence
Each claim is linked to its source study. Confidence reflects the study design — systematic reviews and RCTs rank highest.
The prevalence of cobalamin deficiency among vegetarians↗
Vegetarian and vegan dietary patterns increase risk of vitamin B12 deficiency without reliable intake.
Primary Literature
Interactions & Warnings
Contraindications
- ⚠Known B12 deficiency symptoms requiring medical evaluation
Interactions
- •Metformin and acid-suppressing medications can affect B12 status
Measurable Outcomes
Related Protocols
Iron and Ferritin Screening
Screen ferritin before supplementing iron. Low ferritin can contribute to fatigue, particularly in menstruating women, but iron should be guided by labs and clinician review.
Creatine Monohydrate
3-5g daily of the most researched supplement in sports science. Benefits extend beyond muscle to cognition, bone health, and potentially neuroprotection.
Vitamin D3 + K2
2,000-5,000 IU vitamin D3 daily with K2 (MK-7). Most people are deficient, and optimal levels (40-60 ng/mL) support immune function, bone health, and mood.
Magnesium (Glycinate/Threonate)
200-400mg elemental magnesium daily. Half the population is deficient in this mineral involved in 300+ enzymatic processes including sleep, muscle function, and mood.