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Vegan Vitamin D3 (Lichen)

Cholecalciferol extracted from lichen rather than sheep's wool. It is the same molecule as standard D3, and D3 is clearly better than the other vegan option (D2) at raising blood levels — but no trial has compared lichen-derived to lanolin-derived D3 directly.

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What the science says

  • D3 raises blood levels better than D2 Moderate evidence

    A systematic review and meta-analysis of 24 studies (1277 participants) found cholecalciferol raised total 25(OH)D by about 16 nmol/L more than ergocalciferol (D2) and lowered PTH more, consistently across doses and populations. For vegans this is the relevant comparison.

  • What vitamin D actually delivers is modest Moderate evidence

    A meta-analysis of 43 randomized trials found vitamin D supplementation gives a small reduction in the risk of acute respiratory infection, while a 2026 review of 69 trials found little to no effect on fractures or falls. Correcting a deficiency is worthwhile; large benefits in replete people are not established.

  • The lichen source itself is untested Limited evidence

    No published human trial has compared lichen-derived D3 with lanolin-derived D3. The case for equivalence rests on them being the identical molecule, which is reasonable but not demonstrated.

Dosage & safety

Studied dose1000–2000 IU/day suits most adults. Higher doses should be used only to correct a documented deficiency and ideally guided by a blood test. Take with a fat-containing meal.
SafetySafe at normal doses. Sustained intakes above ~4000 IU/day can cause hypercalcemia, and very high doses have been linked to more falls in older adults. Interacts with thiazide diuretics and digoxin; caution with sarcoidosis, tuberculosis and other granulomatous conditions. Check that a "vegan" product's capsule shell is also plant-based.

How to take it

TimingTiming does not matter.
With food?With the largest fat-containing meal of the day — absorption is substantially better than on an empty stomach.
Worth knowingCheck the capsule shell is plant-based too; lichen-derived D3 in a gelatin capsule is not a vegan product.

Interactions

With medications

  • thiazide diuretics

    Both raise serum calcium and together can cause hypercalcemia. avoid high doses and have calcium checked

  • digoxin

    Raised calcium increases the risk of digoxin toxicity. talk to your doctor before taking more than a standard dose

  • cholestyramine, colestipol and orlistat

    They bind fat and reduce vitamin D absorption. separate by at least 4 hours

With other supplements

  • calcium supplements

    It is the combination, not vitamin D alone, that drives hypercalcemia at high doses. do not push both to high doses at once

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Is lichen vitamin D3 as good as regular D3?

Lichen-derived D3 is the same molecule, cholecalciferol, as standard lanolin-derived D3, which is a reasonable basis for equivalence. No human trial has compared the two directly, so equivalence is assumed rather than demonstrated.

Is vegan D3 better than vitamin D2?

Yes: a meta-analysis of 24 studies found vitamin D3 raised blood 25(OH)D by about 16 nmol/L more than D2 and lowered PTH more, a moderate-grade finding. That makes lichen D3 the better vegan option.

How much vegan vitamin D3 should I take per day?

1000–2000 IU/day of vegan vitamin D3 suits most adults, taken with the largest fat-containing meal of the day. Higher doses should be reserved for correcting a documented deficiency, ideally guided by a blood test.

Can you take too much vegan vitamin D3?

Yes: sustained intakes above about 4000 IU/day of vitamin D3 can cause hypercalcemia, and very high doses have been linked to more falls in older adults. Take care with thiazide diuretics, digoxin and granulomatous conditions such as sarcoidosis.

Scientific references

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