Vegan vitamin D3: lichen instead of lanolin, correctly dosed
ca. 14 Minuten
If you eat a vegan diet and still often feel tired or struggle to bounce back after winter, vitamin D eventually makes the list of suspects. And rightly so: in its 2024 position paper on vegan diets, the German Nutrition Society lists vitamin D among the nutrients that may be critical in an exclusively plant-based diet.
This has less to do with the menu than with the source. The few foods with significant vitamin D content are mostly animal-based, especially oily saltwater fish, and in smaller amounts, eggs, beef liver, cheese, butter and milk (German Federal Institute for Risk Assessment, FAQ dated December 30, 2025). Plant-based sources include mushrooms, which provide some vitamin D as D2; their vitamin D content can be increased through UV exposure (BfR, FAQ dated December 30, 2025). When this food group is excluded, the skin is left to make up the difference, but in Germany it doesn’t produce enough from October to March.
This article clears up three things: how D2 differs from D3, how to identify a truly vegan D3 supplement, and why it only makes sense to ask about the amount after testing.
The invisible gap in a vegan diet
Many people change their diet and plan it carefully. For most nutrients, this planning pays off. With vitamin D, though, it reaches a limit that has nothing to do with discipline: the usual diet in Germany provides just 2 to 4 micrograms of vitamin D per day, and with sufficient sun exposure, 80 to 90 percent of our supply comes from the body’s own production in the skin (German Federal Institute for Risk Assessment, FAQ dated December 30, 2025).
There’s a lot of confusion, especially when it comes to a vegan diet. Some people think a balanced diet automatically covers everything. Others rely on getting a little sun in their daily lives. In practice, both can fall short, particularly in Germany and other northern latitudes.
If you’d like to learn more about a well-planned plant-based diet, the article on eating vegan healthily is a useful companion. Vitamin D3 is still a special case. It is less a classic dietary mistake than a structural issue involving daily life, the seasons and limited sources.
Why this gap often goes unnoticed for a long time
Vitamin D can be tricky because you don’t always immediately notice when your levels are low. Some people only feel that they’re somehow not quite as resilient. Others have no clear signs at all, so they assume everything is fine.
Important in everyday life: A healthy lifestyle does not automatically protect you from a vitamin D deficiency. Health-conscious people often overlook this, especially because they’re doing many other things right.
Why vegans need to pay particular attention to the sunshine vitamin
The core problem is simple: Vitamin D3 traditionally comes mostly from animal sources, while the body’s own production depends on sunlight. When both are absent or fluctuate in everyday life, a gap can quickly arise.
The core problem isn’t a labeling issue, but a raw-material issue. Cholecalciferol, or vitamin D3, is traditionally sourced for supplements from lanolin, the fat from sheep’s wool. This source is not suitable for a vegan diet. The plant-based source is lichen, often listed as “lichen” in ingredient lists.
The second part of the problem is the calendar. In Germany, sunlight from October to March is not strong enough to ensure adequate vitamin D production (Federal Institute for Risk Assessment, FAQ dated December 30, 2025). The body does store vitamin D in fat and muscle tissue, which helps carry you through the winter. But only a test can show whether your reserves are enough.
Diet alone is often not enough
Many people look to food first. That’s understandable, but this strategy only goes so far with vitamin D. If you’re wondering what foods contain it at all, our overview of vitamin D foods gives you a good idea of how limited the selection is in practice.
A vegan diet makes the problem worse because conventional D3 from animal sources is out of the question. That often leaves only sunlight or a suitable supplement.
The sun doesn’t always help when you need it
In theory, your body can produce vitamin D on its own. In practice, this depends heavily on the time of year, how long you spend outdoors, and your daily routine. Many people work indoors, exercise in the evening, or barely see direct sunlight in winter.
In Germany, this often means that the sun simply isn’t reliable enough during the months when you need support most. It has nothing to do with willpower. It’s simply the reality of our climate and lifestyle.
Anyone who follows a vegan lifestyle and wants to get through the winter in Germany usually needs a deliberate strategy for vitamin D rather than hoping for the best.
Vitamin D2 vs. D3 and what your body really needs
This is often where the next uncertainty arises. There is vitamin D2 and vitamin D3. They sound similar, but they are not the same when it comes to practical supplementation.
The factual difference is the source. D3 is the form the skin produces itself when exposed to sunlight; D2 occurs in mushrooms and yeasts, where UV exposure can increase its content (BfR, FAQ dated December 30, 2025). Both are vitamin D. We won’t describe how the two forms compare in their effects, because we don’t have a statement from an institution dated to a specific year on this.
The key difference
Vitamin D2 is called ergocalciferol.
Vitamin D3 is called cholecalciferol.
For a long time, D2 was the main known option for vegans. Today, however, there is also vegan D3, usually from lichen. This is important because it lets you use the D3 form without relying on animal-derived raw materials.
What can reliably be said about vegan D3
Caution is warranted here. Figures on increases in blood levels from lichen-based supplements are circulating, but their origins cannot be reliably traced. They cannot be substantiated with an institution and year, so they are not included here.
What can be stated is the chemical fact: cholecalciferol from lichen is the same molecule as cholecalciferol from lanolin. In its description of vitamin D metabolism, the BfR explicitly distinguishes only between ergocalciferol (D2) and cholecalciferol (D3), not by source material (BfR, FAQ dated December 30, 2025).
For the conversion needed on every label: one microgram equals 40 international units, so 20 µg is 800 IU (BfR, FAQ dated December 30, 2025).
Vitamin D2 vs. vitamin D3 at a glance
| Feature | Vitamin D2 (ergocalciferol) | Vitamin D3 (cholecalciferol) |
|---|---|---|
| Basic form | Ergocalciferol | Cholecalciferol |
| Typical vegan classification | usually considered vegan | vegan only if the source is plant-based |
| Typical source | Mushrooms or yeasts | often lanolin; also available vegan from lichen |
| What to look out for | read the form carefully | check the source too |
| common practice for many vegans | possible, but often not the first choice | often the targeted choice for supplements |
Key takeaway: If a supplement only says “vitamin D3,” that doesn’t tell you whether it’s vegan.
Vegan vitamin D3 from lichen
For a long time, there was a trade-off: yes to D3, no to animal-derived ingredients. Lichens resolve it. They produce the same precursor from which cholecalciferol is also formed in human skin.
The result isn’t a less potent plant-based version, but the same compound. The difference lies in the starting material, not the molecule. That’s why vegan supplements generally say “cholecalciferol from lichen,” not “plant-based vitamin D2.”
How to Recognize Genuine Vegan D3
Many labels make things unnecessarily complicated. “Vitamin D3” is displayed prominently on the front, but the source of the ingredient is missing. That leaves it unclear whether it comes from lanolin or a vegan source.
So look out for these points:
- “Vegan” must be clearly stated. Seeing only D3 isn’t enough.
- The source should be specified. Wording like “from lichen” or “lichen” is a good sign.
- Cholecalciferol is the right form. That’s the D3 form you want.
- It’s best to avoid unclear labels. If the source can’t be verified, an unnecessary question mark remains.
Why This Builds Trust
Many vegans wonder whether plant-based D3 means they’re getting something different in the bottle. Chemically, no: cholecalciferol from lichen and cholecalciferol from lanolin are the same molecule. The difference is in the source, not the form of vitamin.
That takes the edge off the question. If you’re vegan, you don’t have to turn to an animal-derived ingredient for D3.
No More Guessing: How to Test Your Vitamin D Level So Easily
Many people make the same mistake with vitamin D. They simply take some dose because a friend does too or because a product sounds good on social media. That might work. But it might not meet your needs.
It makes more sense to know your status first. In practice, there’s a big difference between “I want to maintain my level” and “I need to correct a deficiency.”
Why Testing Is Better Than Guessing
A blood test turns a guess into a decision. It doesn’t answer whether you should take anything at all, but how much. This is especially worthwhile with a vegan diet, because then you won’t have to start from scratch every winter.
Anyone looking for a simple at-home solution can find a good overview in the article about the at-home vitamin D test.
What Is Measured and With What
What is measured is not “vitamin D” but 25-hydroxyvitamin D in the blood. At mybody®x (MYBODY Lab GmbH), it is measured as 25-OH vitamin D3 from capillary blood, meaning a few drops of blood from the fingertip. This value reflects both dietary intake and the body’s own production (German Federal Institute for Risk Assessment, FAQ dated December 30, 2025).
There are two options, and they answer questions with different levels of precision:
- Vitamin D self-test, €14.50 (as of September 8, 2026): Rapid test with test cassette and finger prick; results in 5 to 10 minutes. The result is an estimate and is not analyzed by a laboratory.
- VitalCheck | Nutrient & Mineral Test Complete, €169.00 (as of September 8, 2026): 18 values with laboratory analysis. This is often the more suitable choice for a vegan diet, because vitamin D is not assessed on its own.
One note about the testing method is particularly relevant for plant-based diets: the BfR points out that most automated immunoassays are less effective at detecting vitamin D2, so levels may be underestimated in people who mainly use products containing D2 (BfR, FAQ dated December 30, 2025). Those who take D3 from lichen are not affected by this.
A level-headed decision is usually best
If you don’t want to rely on gut feeling when it comes to vegan vitamin D3, getting tested is the most reassuring option. That way, you don’t need to rely on forum opinions or a one-size-fits-all winter routine.
It’s important to understand what the tests can’t do: they don’t provide a diagnosis or replace a medical examination. Reference ranges depend on the laboratory, method, and age; the information on your test result always takes precedence. Our products are not intended to diagnose, treat, cure, or prevent diseases.
Your path to the target range: replenish or maintain
Once you have the result, the question becomes concrete. It’s no longer “should I take something?” but “replenish or maintain?”
The classification you are using comes from the German Federal Institute for Risk Assessment and is based on guidance from the former Institute of Medicine, USA: Below 30 nmol/l (12 ng/ml), there is a risk of vitamin D deficiency. Values between 30 and 50 nmol/l (12 to 20 ng/ml) are considered suboptimal. From 50 nmol/l (20 ng/ml), the level is considered adequate for bone health (BfR, FAQ dated December 30, 2025). Conversion: multiply ng/ml by 2.5 to get nmol/l.
The amount depends on your level
There is an evidence-based range for maintenance. The German Nutrition Society gives an estimated value for an adequate intake of 20 micrograms, or 800 International Units per day, applicable when the body does not produce vitamin D itself. For dietary supplements, the BfR recommends choosing products with up to about 20 µg (800 IU) per daily dose (BfR, FAQ dated December 30, 2025).
We deliberately don’t give a figure here for raising a low level. From a medical perspective, higher doses may be appropriate in certain cases, but they should then be accompanied by regular monitoring of serum levels (BfR, FAQ dated December 30, 2025). The BfR advises against high-dose bolus doses, meaning a large amount taken at weekly or monthly intervals.
The detailed version, including conversions, upper limits, and timing, is in our guide to Vitamin D3 drops: dosage, intake, and monitoring. We won’t repeat it here.
Spending time outdoors remains the first step
A supplement is the third option, not the first. According to the BfR, for about half the year it’s enough to expose around a quarter of your body to the sun for 5 to 25 minutes several times a week, depending on skin type and season, without risking sunburn (BfR, FAQ dated December 30, 2025).
Short-wave UV-B radiation is needed for this. That’s why practically nothing happens behind an office window, and a tanning bed is no substitute: The BfR considers it inadvisable to use tanning beds to improve vitamin D levels due to the potential health risks (BfR, FAQ dated December 30, 2025).
Everyday rule: A good vitamin D plan rarely consists of just one capsule. It combines testing, the right amount, and a routine you can actually stick to.
What you can do starting today
If you want to keep things simple, follow this order:
- Don’t guess; know your status.
- Choose vegan D3 clearly labeled as cholecalciferol from lichen.
- Base the dosage on your level, not general opinions.
- Make the most of sunshine and movement whenever your daily routine allows.
- Check again later whether your plan is really working for you.
This turns an unclear topic into a manageable project. And that’s the real point of vegan vitamin D3: you don’t have to be perfect. You just need an approach that’s measurable, plant-based, and practical for everyday life.
Frequently asked questions about vegan vitamin D3
Is vitamin D3 always animal-derived?
No. Traditionally, cholecalciferol is obtained from lanolin, the wool grease of sheep. But cholecalciferol from lichens is also available, and it is the same compound. If the package only says “vitamin D3,” that doesn’t tell you where it came from.
Is vitamin D2 from mushrooms enough?
D2 is ergocalciferol, and D3 is cholecalciferol. The BfR notes that most automated laboratory methods detect vitamin D2 less effectively, so the measured level may be underestimated when D2 is the primary source (BfR, FAQ dated December 30, 2025). If you’re getting tested and want to manage your level, D3 from lichens is a more practical option.
How much vegan D3 per day?
For maintenance, the German Nutrition Society gives an estimated value of 20 micrograms or 800 IU per day when the body produces none of its own; for food supplements, the BfR recommends up to around 20 µg per daily dose (BfR, FAQ dated December 30, 2025). There is no universal amount for raising a low level; that should be managed by a doctor.
Is mybody®x Vitamin D3 K2 Complex vegan?
We don’t have a confirmed source for this, so we don’t describe it as vegan here. If you need a vegan source, check the ingredient list of the product you plan to buy for the label “from lichens” or “lichen.”
Do I need to get tested every year?
A test makes sense when something changes: when you start supplementing, after adjusting the amount, or if symptoms arise. Anyone taking higher doses than the BfR recommends for food supplements should have their serum levels checked regularly by a doctor (BfR, FAQ dated December 30, 2025).
If you no longer want to guess your vitamin D status: the Vitamin D self-test for €14.50 provides an estimate in just a few minutes, while the VitalCheck | Complete nutrient & mineral test for €169.00 provides a laboratory analysis of 18 values (prices as of September 8, 2026). Especially if you eat vegan, this is the shortest route from uncertainty to a decision.
