The Complete Vegan Supplement Checklist: What You're Probably Missing

The Nutrients a Vegan Diet Can — and Cannot — Provide

A well-planned vegan diet can be extraordinarily healthy. It is associated with lower rates of heart disease, type 2 diabetes, and certain cancers. But "well-planned" is the operative phrase. Several essential nutrients are either absent from plant foods, present in poorly absorbed forms, or require intake levels that are difficult to achieve without supplementation.

The claim that "you can get everything you need from a whole-food vegan diet" is not just inaccurate — for B12 specifically, it is dangerous misinformation that has caused documented cases of irreversible neurological damage.

Here is the complete evidence-based checklist.

Non-Negotiable: Supplement These

1. Vitamin B12

Dose: 2,500 mcg cyanocobalamin weekly, or 250 mcg daily Priority: Critical — no exceptions

There is no reliable plant source of B12. Nutritional yeast and fermented foods contain analogues that may actually interfere with true B12 absorption. B12 deficiency causes megaloblastic anaemia and, if prolonged, irreversible peripheral neuropathy and cognitive decline.

A 2013 study in the European Journal of Clinical Nutrition found that 52% of vegans were B12 deficient (serum B12 <200 pg/mL) compared to 7% of omnivores. Subclinical deficiency (200–300 pg/mL) was present in an additional 20%.

Use methylcobalamin or cyanocobalamin — both are effective. Cyanocobalamin is better studied and more stable. Jarrow Formulas Methylcobalamin 5000 mcg is a popular high-quality option for vegans.

2. Omega-3 (DHA + EPA)

Dose: 250–500 mg combined DHA+EPA daily from algae oil Priority: Critical

The body can convert alpha-linolenic acid (ALA) from flaxseed, chia, and walnuts into DHA and EPA. The problem: conversion efficiency is below 5% for DHA and 8% for EPA according to a 2006 review in the American Journal of Clinical Nutrition. Some individuals with certain FADS gene variants convert at virtually zero.

DHA is essential for brain function, retinal health, and inflammation regulation. Do not rely on flax or chia — use algae-based DHA+EPA supplements. These provide the same omega-3s as fish oil (fish get their DHA from algae in the first place). Nordic Naturals Algae Omega is one of the few third-party tested algae options.

3. Vitamin D3

Dose: 2,000–4,000 IU daily (adjust based on blood levels) Priority: High

Vitamin D deficiency is common across all diets, but vegans are at higher risk because most D3 supplements are derived from lanolin (sheep wool). Lichen-sourced vegan D3 is now widely available and equally effective. Vitamin D2 (ergocalciferol) is vegan but raises blood levels 87% less effectively than D3.

Target blood levels: 40–60 ng/mL. Test annually, especially if you live above 35°N latitude.

Likely Needed: Assess and Supplement

4. Iron

Dose: 18–36 mg/day for pre-menopausal women; men and post-menopausal women may not need supplementation Priority: High for women; assess for men

Plant-based (non-heme) iron absorbs at 2–20% compared to 15–35% for heme iron from animal sources. Phytates in grains and legumes further reduce absorption. The Institute of Medicine recommends vegans consume 1.8x the RDA for iron.

Practical tips:

• Take iron with vitamin C — 75 mg vitamin C can increase non-heme iron absorption by 3–4x
• Avoid iron with coffee, tea, or calcium — these block absorption
• Cook in cast iron — especially with acidic foods like tomato sauce
• Test ferritin regularly — target 50–70 ng/mL

5. Zinc

Dose: 12–15 mg/day (50% above standard RDA) Priority: High

Phytates in legumes, grains, and nuts bind zinc and reduce absorption by up to 50%. The World Health Organization recommends vegans consume 50% more zinc than omnivores. A 2013 meta-analysis in the Journal of the Science of Food and Agriculture confirmed significantly lower zinc status in vegetarians and vegans.

Soaking, sprouting, and fermenting grains and legumes reduces phytate content. Supplemental zinc picolinate or zinc bisglycinate provides superior absorption.

6. Iodine

Dose: 150 mcg/day Priority: High if not using iodized salt

Iodine is essential for thyroid function. Dairy products and fish are the primary dietary sources in most Western diets. Vegans who avoid iodized salt and sea vegetables are at significant risk of deficiency. A 2011 study in the British Journal of Nutrition found vegans had the lowest urinary iodine concentrations of any dietary group.

Use iodized salt or supplement with 150 mcg potassium iodide. Avoid kelp supplements — iodine content varies wildly and can cause thyroid dysfunction from excess.

7. Calcium

Dose: 500–600 mg/day supplemental (if dietary intake is below 1,000 mg) Priority: Moderate to high

Fortified plant milks, tofu made with calcium sulfate, and leafy greens (kale, bok choy — not spinach, whose oxalates block absorption) can provide adequate calcium. But many vegans fall short. A 2009 EPIC-Oxford study found vegans had a 30% higher fracture rate than omnivores, largely attributable to lower calcium intake.

If your diet consistently includes fortified foods, you may not need a supplement. If not, add 500–600 mg calcium citrate daily — preferably split into two doses for better absorption.

Often Overlooked

8. Choline

Dose: 400–550 mg/day from diet + supplement Priority: Moderate

Choline is essential for liver function, brain development, and methylation. Eggs and liver are the richest dietary sources — both absent from vegan diets. A 2019 analysis in BMJ Nutrition, Prevention & Health warned that plant-based diets may be insufficient in choline.

Soy, quinoa, broccoli, and shiitake mushrooms provide some choline, but most vegans fall well below the adequate intake. Consider a choline bitartrate or citicoline supplement if your diet is low in soy.

9. The BCMO1 Gene Variant and Vitamin A

Most people assume beta-carotene from carrots and sweet potatoes converts to vitamin A (retinol) efficiently. For many, it does — but approximately 45% of the population carries a BCMO1 gene variant that reduces conversion efficiency by 32–69% (2009 study in The FASEB Journal).

For these individuals, even high beta-carotene intake may not provide adequate preformed vitamin A. Signs of poor conversion include dry skin, poor night vision, and frequent infections despite a carotene-rich diet. Genetic testing can identify this variant. If affected, consider a retinol-equivalent supplement from provitamin A carotenoids or discuss with your doctor.

The Vegan Supplement Stack

Daily essentials:

• B12: 250 mcg cyanocobalamin or methylcobalamin
• Algae omega-3: 250–500 mg DHA+EPA
• Vitamin D3: 2,000 IU (lichen-sourced)
• Iodine: 150 mcg (if not using iodized salt)

Assess and add if needed:

• Iron: Test ferritin; supplement if below 50 ng/mL
• Zinc: 12–15 mg if diet is high in grains/legumes
• Calcium: 500–600 mg if not consuming fortified foods
• Choline: 300–400 mg if soy intake is low

A well-supplemented vegan diet is nutritionally complete. An unsupplemented one carries real risks. The evidence is clear — plan accordingly.

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