How much B12 do vegans need?

Guidance generally points to a daily low-dose supplement or a larger weekly dose, with the weekly figure much higher than seven daily doses because absorption falls as dose size rises. Confirm the specific amounts with your clinician or national dietary guidance.

Do I still need B12 if I eat nutritional yeast?

Only if that specific product is fortified — many are not. Check the label rather than assuming.

Food & Nutrition

B12 supplement vs fortified foods

B12 is the one nutrient every credible plant-based guideline treats as non-negotiable. There are two dependable delivery routes — a supplement or consistently fortified foods — and the right choice is mostly a question of whether your eating pattern is regular enough to rely on the second.

Side by side

B12 supplement compared with Fortified foods
Criterion	B12 supplement	Fortified foods
Reliability	Predictable dose regardless of what you ate that day.	Depends on eating fortified products consistently; brands change formulations without notice.
Cost	A year's supply is inexpensive.	Built into the grocery bill, but fortified products often cost more than unfortified ones.
Absorption	Larger, less frequent doses absorb at a lower percentage — which is why weekly dosing uses a much higher number.	Small amounts spread through the day absorb efficiently.
Best for	Anyone with an irregular diet, pregnancy, older adults, or absorption conditions.	People with a very stable daily routine built around fortified plant milk and cereal.

Questions people ask

How much B12 do vegans need?: Guidance generally points to a daily low-dose supplement or a larger weekly dose, with the weekly figure much higher than seven daily doses because absorption falls as dose size rises. Confirm the specific amounts with your clinician or national dietary guidance.
Do I still need B12 if I eat nutritional yeast?: Only if that specific product is fortified — many are not. Check the label rather than assuming.