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Plant-based vitamins: a nutrient-by-nutrient guide
The short answer
On a plant-based diet the nutrients to watch are B12, vitamin D, iodine, omega-3 (EPA/DHA), iron, zinc and calcium. B12 needs a supplement or fortified foods; the rest can often come from food, with supplements filling specific gaps a blood test shows.
The nutrient table
- Vitamin B12 — no reliable plant source. Supplement or fortified foods. Adult need: 2.4 mcg/day.
- Vitamin D — sunlight, fortified foods, lichen-based D3. Adult need: 600 IU (15 mcg)/day, 800 IU over 70.
- Iodine — iodized salt, seaweed in small amounts. Adult need: 150 mcg/day.
- Omega-3 EPA/DHA — algae oil. Flax, chia and walnuts give ALA, which converts poorly.
- Iron — lentils, chickpeas, tofu, pumpkin seeds, dark greens; absorb better with vitamin C.
- Zinc — legumes, oats, seeds, nuts; soaking and sprouting improve absorption.
- Calcium — calcium-set tofu, fortified plant milks, kale, bok choy.
Reference intakes above are from the NIH Office of Dietary Supplements.
Food first, supplements for the gaps
Whole plant foods bring fiber and phytonutrients a pill doesn't. Supplements are best used to cover what food can't — B12 always, and D, iodine or iron when your diet or a test says so.
Whole-food powders
Greens and red superfood powders, moringa and beetroot are concentrated foods rather than isolated vitamins. They add plant compounds to a routine but don't replace B12 or D. See moringa benefits and beetroot powder benefits.
Building a simple routine
- Daily: B12 (or a few times a week at a higher dose), D3 in winter or all year if you get little sun.
- As needed: iron, iodine, algae omega-3.
- Optional: magnesium, mushrooms, adaptogens.
Questions
- Can you get all vitamins from plants?
- All except vitamin B12, which needs fortified foods or a supplement. Vitamin D is often low regardless of diet.
- Are whole-food vitamins better than synthetic?
- Not always. Some synthetic forms, such as folic acid in fortified foods or cyanocobalamin, are well studied and stable. Choose by form and dose, not marketing.
From the shop
This article is for general information and isn't medical advice. These statements have not been evaluated by the Food and Drug Administration. Products are not intended to diagnose, treat, cure or prevent any disease. Talk to a healthcare professional before starting a supplement, especially if you are pregnant, nursing or take medication.