Why Plant-Based Diets May Fall Short for Growing Children
Children's vitamins are often the first line of defence when plant-based diets — vegan or vegetarian — fail to supply all nutrients through food alone. Plant foods are rich in many micronutrients, but a handful of nutrients are either absent from plant sources or present in forms that are poorly absorbed. For growing children, these gaps are not trivial: inadequate intake during development can affect bone mineralisation, neurological development, and immune function.
This article focuses specifically on the nutrients that are most likely to be deficient in children following vegan or strict vegetarian diets, the dose targets supported by current research, and how to choose a suitable supplement.
Nutrients Most Likely to Fall Short
Vitamin B12
Vitamin B12 occurs naturally only in animal products. No plant food reliably provides adequate B12; fermented foods and algae contain analogues that may interfere with rather than support B12 status. For vegan children, supplementation is not optional — it is essential.
Insufficient B12 in childhood is associated with neurological damage that may be irreversible. Detailed dose guidance per age group is outside the scope of a supplement guide — consult a registered dietitian or paediatrician for your child's specific requirements.
Vitamin D
Vitamin D from food is low in both vegan and omnivore diets in northern Europe. Children at northern latitudes, particularly in Estonia where sunlight is limited for much of the year, are at particular risk of insufficiency. Munns et al. (2016) reviewed global rickets and vitamin D deficiency data and concluded that routine supplementation is warranted for children in higher-latitude regions (Munns et al., 2016).
Vegan children should use vitamin D3 derived from lichen (vegan-friendly) rather than lanolin-based D3.
Iron
Plant-based diets provide non-haem iron, which is absorbed less efficiently than the haem iron found in meat. Vitamin C consumed in the same meal enhances non-haem iron absorption. Children with high requirements for growth who eat exclusively plant-based need monitoring. Regular iron status checks via a GP are more reliable than supplementing blindly.
Omega-3 Fatty Acids
Alpha-linolenic acid (ALA) is found in flaxseed, chia, and walnuts, but conversion to the long-chain DHA and EPA needed for brain development is limited. Vegan DHA/EPA supplements derived from algae (the original source used by fish) are the practical solution. Koletzko et al. (2008) highlighted the importance of adequate DHA supply in early life for cognitive development (Koletzko et al., 2008).
Calcium and Iodine
Calcium from fortified plant milks can meet needs if consumed consistently. Iodine is an often-overlooked shortfall in vegan diets; seaweed is unreliable as a source due to variable iodine content. A supplement providing iodine is often warranted.
Vegan-Friendly Sources in Supplements
When choosing children's vitamins labelled "vegan," check:
- Vitamin D3 from lichen (not lanolin)
- B12 as cyanocobalamin or methylcobalamin
- Omega-3 DHA/EPA from algae, not fish oil
- No gelatin capsule shells (use pectin-based or chewable tablet formats)
- Iron as a separate supplement if indicated, not bundled in a general multivitamin (easier to titrate dose)
Dose Targets
Dose recommendations depend on age, weight, and baseline dietary intake. Age-specific reference values are published by the European Food Safety Authority for EU countries. General children's multivitamins rarely provide adequate B12 or omega-3 DHA doses for a fully vegan child — individual supplements for these nutrients are usually more appropriate than a single multivitamin.
What to Combine
- B12 + folate: work together in one-carbon metabolism; many B-complex formulations cover both
- Vitamin D3 + K2: often co-formulated; K2 supports appropriate calcium distribution
- Iron + Vitamin C: take together to maximise absorption; separate from calcium
- DHA/EPA (algae): take with a meal containing fat to improve absorption
Choosing a Vegan Product
Look for products that specify the vegan source of each nutrient on the label. Brands that sell children's vitamins marketed as "vegan" or "plant-based" should carry independent verification (e.g., Vegan Society trademark, or third-party certification).
At maxfit.ee the selection includes BIOTECHUSA Vegan Protein 500g Metsaviljad and OstroVit Vegan Meal Shake 1000g Cappuccino for older adolescents needing extra protein on a plant-based diet, alongside individual micronutrient supplements.
FAQ
Do vegan children need a different multivitamin from omnivore children?
Yes, in most cases. Standard children's multivitamins are formulated assuming some animal product consumption and typically under-dose B12 and do not include algae-derived omega-3. Vegan children usually need targeted supplements rather than just a general multivitamin.
Is it safe to give children multiple supplements at once?
Generally yes, if each supplement is within age-appropriate dose limits and they are not duplicating the same nutrient at high levels. The main risk is exceeding the tolerable upper intake level for fat-soluble vitamins (A, D, E, K) if multiple products each contain them. Check totals across all products.
At what age can a child switch from drops to chewable tablets?
Most chewable tablet formats are suitable from around age three, when children can chew safely without choking risk. Always follow the product's age guidance and check with a healthcare professional if unsure.
References
Munns, C. F., Shaw, N., Kiely, M., Specker, B. L., Thacher, T. D., Ozono, K., Michigami, T., Tiosano, D., Mughal, M. Z., Makitie, O., Ramos-Abad, L., Ward, L., DiMeglio, L. A., Atapattu, N., Cassinelli, H., Braegger, C., Pettifor, J. M., Seth, A., Idris, H. W., ... & Hochberg, Z. (2016). Global consensus recommendations on prevention and management of nutritional rickets. Journal of Clinical Endocrinology and Metabolism, 101(2), 394-415. https://pubmed.ncbi.nlm.nih.gov/26745253/
Koletzko, B., Lien, E., Agostoni, C., Bohles, H., Campoy, C., Cetin, I., Decsi, T., Dudenhausen, J. W., Dupont, C., Forsyth, S., Hoesli, I., Holzgreve, W., Lapillonne, A., Putet, G., Secher, N. J., Symonds, M., Szajewska, H., Willatts, P., & Uauy, R. (2008). The roles of long-chain polyunsaturated fatty acids in pregnancy, lactation and infancy. Journal of Perinatal Medicine, 36(1), 5-14. https://pubmed.ncbi.nlm.nih.gov/18184094/
Tong, T. Y. N., Appleby, P. N., Bradbury, K. E., Perez-Cornago, A., Travis, R. C., Clarke, R., & Key, T. J. (2019). Risks of ischaemic heart disease and stroke in meat eaters, fish eaters, and vegetarians over 18 years of follow-up. BMJ, 366, l4897. https://pubmed.ncbi.nlm.nih.gov/31484644/
