Vegan and vegetarian supplements — the short list that matters

Plant-based eating has become mainstream enough that the supplement conversation deserves to be concrete. Some nutrients are harder to get in useful amounts without animal foods. Some are not. This is the short list of what actually matters — and which specific forms to look for when you supplement.

The three nutrients that are genuinely difficult on a plant-based diet

Vitamin B12 — cobalamin. The big one. B12 is produced by bacteria, not plants. It sits in significant amounts only in animal foods — meat, fish, eggs, dairy. Fortified foods (plant milks, nutritional yeast, some cereals) can cover baseline needs if chosen carefully, but a daily or weekly B12 supplement is the more reliable route. A 2014 review of B12 status in vegetarians and vegans found high rates of deficiency across age groups, with the highest prevalence in vegans, infants, and pregnant women ^[1].

Form matters. Cyanocobalamin is the cheapest form; methylcobalamin and adenosylcobalamin are the biologically active forms your cells use directly. Methylcobalamin is what quality B-complexes use. Our Vitamin B-Complex covers B12 as methylcobalamin alongside the other seven Bs ^[2].

Long-chain omega-3 (EPA and DHA). Plants contain ALA, which the body can theoretically convert to EPA and DHA — but the conversion is very inefficient. A frequently cited stable-isotope study in young women found roughly 21% of dietary ALA converted to EPA and only about 9% to DHA, with conversion to DHA effectively negligible in many men ^[3]. For the authorised heart, brain, and vision claims (250 mg EPA+DHA daily for heart and DHA for brain/vision), direct EPA and DHA are needed ^[4].

Algae oil is the direct vegan option. Our life'sOMEGA algae oil capsules deliver 600 mg DHA and 200 mg EPA per serving from sustainable microalgae fermentation — the original source of marine omega-3 before fish eat it. No fish, no flax-seed conversion guesswork.

Vitamin D — harder on a plant-based diet because the richest natural sources are animal (oily fish, egg yolks). Fortified foods help. UV-exposed mushrooms contain D2, which is less effective than D3 at raising blood levels. D3 from lichen (not the usual lanolin from sheep's wool) is the vegan-suitable supplement form. Our Vitamin D3+K2 MK-7 pairs D3 with K2 in the MK-7 form. UK SACN guidance recommends a daily 10 µg vitamin D supplement during autumn and winter for the general adult population ^[5].

Nutrients worth watching, even if not always deficient

Iron. Plant iron (non-haem) is less bioavailable than animal iron (haem). Vegans and vegetarians are not automatically iron-deficient, but ferritin levels sit lower on average. Combine plant iron sources (legumes, tofu, dark greens, fortified cereals) with vitamin C to boost absorption. Do not supplement without a blood test.

Zinc. Present in plant foods but less bioavailable due to phytate content in grains and legumes. Soaking, sprouting and fermenting all help. Pumpkin seeds are one of the better plant zinc sources.

Iodine. If you avoid both seafood and iodised salt, iodine is a real risk. Seaweed is the main plant source but with wildly variable content. A multi or a sensible iodine source is worth considering.

Calcium. Dairy is the biggest calcium source in most Western diets. Fortified plant milks, tofu set with calcium, almonds, tahini, and leafy greens can cover it — but it needs attention rather than assumption.

Selenium. Brazil nuts are the most concentrated plant source — one to two per day covers the NRV.

Choline. Present in eggs and meat; lower in plant diets. Relevant for cognitive and liver biology; worth looking at if the diet is strict and varied.

What we recommend as a starting stack for a thoughtful plant-based diet

Not every vegan or vegetarian needs everything. A practical starting stack:

1. Vitamin B12 via a quality B-complex with methylcobalamin. Our B-Complex covers this alongside the rest of the family, many of which (folate, B6) also come from similar plant-food sources but in adequate amounts.
2. Algae-oil omega-3. life'sOMEGA. Once daily, with a meal containing fat.
3. Vitamin D3 from lichen, ideally paired with K2. Our D3+K2 MK-7. Through autumn and winter at a minimum; year-round for people with limited sun exposure.
4. Iron — only based on a blood test, not as pre-emptive.

That covers the three genuinely difficult nutrients plus the iron question.

Plant-protein adequacy

A note worth making because it comes up constantly: plant-based diets can absolutely meet protein needs. The lever is variety (different plant protein sources bring different amino acid profiles) and adequate total calories (sub-caloric diets send the first amino acids to energy rather than tissue building). Legumes, tofu/tempeh, seitan, grains, nuts and seeds together cover the amino acid profile easily when calories are adequate.

Collagen peptides are the one protein supplement that is not vegan — they are an animal product (fish or bovine). For plant-based readers looking for connective-tissue support, the amino acid precursors in protein-adequate plant diets do the underlying work; vitamin C is the cofactor that matters most for collagen formation.

Who should check with a doctor

• New to plant-based eating and feeling off — tiredness, low energy, poor concentration. Blood test B12, iron and vitamin D before self-prescribing.
• Pregnant or breastfeeding — nutrient demands rise; discuss supplementation with a midwife or GP.
• Strict low-variety diets (raw, carnivore, frutarian) — specific risk profiles that deserve individual advice.

In practice

A thoughtful plant-based diet is entirely workable. The three nutrients worth making a deliberate plan for are B12, long-chain omega-3 (EPA/DHA), and vitamin D. Algae-oil EPA+DHA, a quality B-complex with methylcobalamin, and D3 from lichen cover the specific gaps. Iron, zinc, iodine and calcium are worth thinking about but not universal supplementation targets.

References

1. Pawlak R, Lester SE, Babatunde T. The prevalence of cobalamin deficiency among vegetarians assessed by serum vitamin B12: a review of literature. Eur J Clin Nutr. 2014;68(5):541–548. PubMed: 24667752
2. NHS. B vitamins and folic acid. nhs.uk
3. Burdge GC, Wootton SA. Conversion of alpha-linolenic acid to eicosapentaenoic, docosapentaenoic and docosahexaenoic acids in young women. Br J Nutr. 2002;88(4):411–420. PubMed: 12323090
4. European Commission. EU Register of Nutrition and Health Claims Made on Foods. ec.europa.eu
5. Scientific Advisory Committee on Nutrition. Vitamin D and Health (2016). gov.uk

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