Vitamin B12 - The one we all know about! It’s really difficult to find vegan sources of vitamin B12 in significant quantities which is why it’s the one nutrient most vegans are recommended to supplement. Vegans who don’t supplement vitamin B12 are at risk of deficiency.
Vitamin D3 - Vitamin D deficiency is a population problem but an even more important issue in vegans.
Zinc - Zinc deficiency in vegans is rarer than some of the other possible deficiencies. However when considering the potential absorption related issues above it is definitely a consideration for vegans.
Iron - It’s definitely possible to get enough iron through a vegan diet but evidence suggest that women eating vegan diets still don’t get enough.
Calcium - Vegans are at risk of lower calcium intake, however it is important to consider that calcium absorption is dependent on having sufficient levels of vitamin D.
Iodine - Iodine content in food of plant origin is lower in comparison with that of animal origin due to low iodine concentration in soil.
Omega 3’s with EPA & DHA - it’s not possible to incorporate the dose required in a multivitamin, therefore a premium vegan omega 3 should be taken daily.