Is vitamin D3 vegan?
Two different vitamins doing the same job
"Vitamin D" on a label almost always means one of two distinct compounds: D2 (ergocalciferol) or D3 (cholecalciferol). They're not interchangeable names for the same thing — they're structurally different molecules with different natural sources and, by most research, somewhat different effectiveness at raising and maintaining vitamin D levels in the body. D2 comes from irradiating ergosterol found in plants, yeast and fungi — a source that's inherently vegan. D3 is what human skin produces from sunlight exposure, and the manufactured form has traditionally been sourced from an animal product: lanolin, the greasy secretion sheep produce in their wool.
Why lanolin-D3 isn't vegan even though no sheep is killed
Lanolin is collected from sheared wool, not from slaughter — but it's still an animal secretion, extracted from an animal-farming supply chain. For most vegans, "not derived from slaughter" doesn't make an ingredient vegan; it still counts as an animal product, in the same category reasoning that rules out honey or silk. Vegetarians who are fine with wool and dairy generally have no objection to lanolin-D3 specifically.
The lichen alternative
Lichen — a composite organism formed from a fungus and an alga or cyanobacterium living together — is capable of producing genuine cholecalciferol, the same molecule as lanolin-derived D3, without any animal involvement. This is the significant point: lichen-D3 isn't a workaround or a weaker substitute, it's the real D3 compound from a different source. It costs more to produce than lanolin extraction, which is why it's not yet the default, but it's increasingly available in supplements and some fortified foods, and brands that use it typically say so explicitly because it's a genuine selling point.
What to check on a label
- Look for whether it's labelled vitamin D2 or vitamin D3 — D2 settles the question immediately.
- If it's D3, look for an explicit "vegan", "lichen-derived" or "plant-based" claim — a genuine signal when present.
- Absent either, assume lanolin-derived unless the manufacturer confirms otherwise — it's still the more common source.
- This applies equally to fortified plant milks, cereals, and standalone vitamin D or multivitamin supplements — check the specific product, not the category.
Related additive questions
Vitamin D3 belongs to the same small cluster of additives where the ingredient name alone doesn't settle the sourcing question — see our guides on glycerin (E422), mono- and diglycerides (E471) and L-cysteine (E920) for the same question applied elsewhere.
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Frequently asked questions
What's the actual difference between vitamin D2 and D3?
D2 (ergocalciferol) is made from irradiated plant or fungal sterols and is always vegan. D3 (cholecalciferol) is the form your skin makes from sunlight, and the manufactured version is traditionally extracted from lanolin — sheep's wool grease — which is not vegan. Both are used to fortify food and in supplements; D3 is generally considered somewhat more effective at raising blood vitamin D levels.
Is lanolin-derived D3 at least cruelty-free, since sheep aren't killed for it?
It doesn't involve slaughter — lanolin is extracted from sheared wool — but it's still an animal product, which is enough for most vegans to avoid it on principle, even though the ethical calculus differs from something like gelatine.
How is vegan D3 actually made?
From lichen — a symbiotic organism (not a plant, technically a fungus-algae partnership) that produces genuine cholecalciferol rather than the plant-only D2. This means vegan D3 isn't a substitute form, it's the same molecule as lanolin-derived D3, just from a different source.
Which foods and products in NZ commonly add vitamin D3?
Fortified milk and plant milk alternatives, some breakfast cereals, and the great majority of multivitamin and standalone vitamin D supplements. Checking whether a specific product uses D2, lanolin-D3, or lichen-D3 means reading the ingredient list or supplement facts panel directly — the front-of-pack usually just says "vitamin D".