Vegan Supplements: What Every Plant-Based Eater Needs to Know

A well-planned vegan diet can be incredibly healthy, but there are certain nutrients that are difficult — or impossible — to obtain in adequate amounts from plant foods alone. Understanding which supplements vegans may need is essential for long-term health on a plant-based diet.

Vitamin B12 is the one supplement that virtually all vegans need. It is not reliably found in any plant foods in sufficient quantities. B12 is essential for nerve function, red blood cell formation, and DNA synthesis. Vitamin B12 contributes to the normal functioning of the nervous system.

The NHS advises vegans to get B12 from fortified foods or a supplement.

While vitamin D deficiency affects the general population, vegans may be at higher risk because most dietary sources are animal-based (oily fish, egg yolks, fortified dairy). Vitamin D3 supplements were traditionally derived from lanolin (sheep's wool), but vegan D3 sourced from lichen is now widely available.

Plant foods provide ALA omega-3 (from flaxseed, chia, walnuts), but conversion to the more important EPA and DHA forms is very limited. Algae-based omega-3 supplements provide EPA and DHA directly and are the primary source fish themselves obtain these fats from.

Plant-based (non-haem) iron is less readily absorbed than haem iron from animal sources. Similarly, zinc from plant foods is less bioavailable due to phytates that inhibit absorption. Plan iron and zinc sources carefully.

Iodine is important for thyroid function but can be lacking in vegan diets, as the primary sources are fish, dairy, and iodised salt. Seaweed can provide iodine but amounts vary wildly. A supplement providing 150 mcg per day is a reliable approach.

Vegans can obtain calcium from fortified plant milks, tofu made with calcium sulphate, leafy greens (kale, pak choi), and sesame seeds. However, meeting the recommended 700 mg daily from these sources alone requires conscious effort. A supplement may be beneficial, especially for those who don't consume fortified foods regularly.

Rather than guessing, build your supplement routine around the nutrients most commonly lacking in plant-based diets:

• Vitamin B12: follow NHS advice; our Vitamins Multi provides 2.5 µg per capsule.
• Omega-3 DHA + EPA: Algae-based omega-3 supplements provide DHA and EPA directly, bypassing the inefficient conversion from plant-based ALA. Algae oil is a vegan source of EPA and DHA.
• Iron: Plant-based (non-haem) iron is absorbed at much lower rates than animal-based (haem) iron. Vitamin C increases iron absorption. Supplement if blood tests show low ferritin.
• Zinc: phytates in grains and legumes reduce zinc absorption; plan zinc sources.
• Iodine: If you don’t use iodised salt or eat seaweed regularly, iodine supplementation (150 mcg/day) is important for thyroid function.
• Vitamin D3: Most D3 supplements are derived from lanolin (sheep’s wool). Vegan D3 made from lichen is now available and equally effective.

While all plant-based eaters should be mindful of nutrient gaps, these groups need particular attention:

• New vegans who have not yet learned to plan nutritionally complete meals
• Vegan athletes with increased demands for protein, iron, zinc, and B vitamins
• Pregnant and breastfeeding vegan women — nutrient requirements increase significantly
• Vegan children and teenagers, who have higher nutrient needs per kilogram of body weight
• Older vegans, as nutrient absorption decreases with age
• Those following raw vegan or highly restrictive plant-based diets

Eat a wide variety of whole plant foods — diversity is key to covering your nutritional bases. Soak and sprout grains and legumes to reduce phytate content and improve mineral absorption. Include a wide range of plant foods. Use fortified plant milks and nutritional yeast as easy sources of B12 and other nutrients. Track your intake periodically using an app like Cronometer to identify any gaps. Get annual blood tests for B12, iron (ferritin), vitamin D, and zinc to catch any deficiencies early. Remember: a well-planned vegan diet supplemented with B12 and other key nutrients can be nutritionally complete and support excellent health.

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This article is for informational purposes only and does not constitute medical advice. Vitadefence supplements are food supplements, not medicines. Consult a healthcare professional if you are pregnant, breastfeeding, on medication, or have a medical condition.