Source of Truth – The Mechanism

For two weeks, we have been writing about a problem. This week, we would rather be useful, because the problem is only worth raising if a buyer can do something about it.

So here is how vitamin D3 is actually made, why plant-source is three routes rather than one, and the five questions that will tell you more about a supplier than any certificate will.

Most vitamin D3 comes from sheep.

Conventional vitamin D3 is cholecalciferol, produced from lanolin, the waxy grease recovered from sheep wool. The lanolin is processed to isolate 7-dehydrocholesterol, which is then converted to cholecalciferol using ultraviolet light. It is a well-established route, it is inexpensive at scale, and it accounts for the overwhelming majority of the vitamin D3 on the market.

There is nothing underhanded about it. It is simply an animal-derived ingredient, and for a brand making a vegan claim, that is the end of the conversation.

There is a second problem with it, though, and the industry talks about it less. Lanolin supply has tightened, and the end-to-end chain behind an animal-derived D3 is rarely controlled by the people selling it. A manufacturer buying conventional vitamin D3 is relying on an assurance that the raw material is wool grease rather than another animal-derived source, and in practice, often cannot verify which, because the chain does not allow it. Before the vegan question arises at all, there is a traceability gap.

It carries a practical cost, too. Animal-origin material brings POAO import and export requirements with it, which adds friction to any supply chain that crosses a border.

Plant-source is not one route. There are three.

This is the part the industry tends to flatten. Plant-source vitamin D3 is listed on a specification as though it were a single ingredient. It is not. There are three distinct plant-source routes, and they start in very different places.

The first is algae. Vitamin D3V^® is cholecalciferol produced from Chlorophyta algae cultivated in the UK, with no animal-origin material at any stage. It meets the USP and EP monographs for cholecalciferol and is not considered novel under Regulation (EU) 2015/2283, so a formulator can switch from conventional D3 without regulatory complication. Because the algae is cultivated and processed entirely in the UK, traceability runs batch to batch, and the process leaves no residual pesticides or contaminants. It is certified vegan, Kosher and Halal, and comes as an oil at 1,000,000 iu/g and a powder at 100,000 iu/g.

The second is EirVit^®, a high-purity cholecalciferol derived from phytosterols sustainably sourced from pine bark. Through a proprietary multi-step process, the phytosterols are converted first into cholesterol meeting USP and EP standards, then synthesised into cholecalciferol. That pathway deliberately mirrors conventional vitamin D3 production, which is what makes EirVit^® the closest drop-in replacement for a lanolin-derived specification, with identical regulatory positioning. It is manufactured in the UK, meets USP and EP, and is Kosher and Halal certified.

Finally, the third is lichen. Vitashine is cholecalciferol extracted from lichen, grown under organic and pesticide-free conditions, and it is the original of the three. Developed with universities and specialist laboratories, it was the world’s first vitamin D3 registered with both The Vegan Society and The Vegetarian Society, and it carries Non-GMO Project, Kosher and the Indian Vegetarian Mark alongside them. It is available as an oil at 1,000,000 iu/g and a spray-dried powder at 100,000 iu/g.

All three deliver cholecalciferol, which is the form the body recognises and uses, with the same activity and regulatory status as the conventional version. The molecule is not the variable. The origin is.

ProTec Nutra supplies all three, and it is deliberate. A brand that needs Vegan Society and Vegetarian Society registration on pack has a different requirement from one that needs Halal certification, or from one that simply wants the closest possible drop-in replacement for an existing lanolin-derived specification. Having three routes means the answer to which plant-source D3 is driven by the application, the market and the claim, rather than by what a supplier happens to stock. We have been doing this since 2011, for more than 200 brand, retail and multinational customers.

What the three have in common.

This matters more than what separates them. All three deliver cholecalciferol rather than ergocalciferol, which is the distinction that actually reaches the consumer, since vitamin D3 is substantially more effective than D2 at raising and maintaining serum 25-hydroxyvitamin D. All three are classified the same way as conventional vitamin D3, so switching creates no regulatory problem. All three are manufactured in the UK. And all three remove the POAO requirements that come with animal-origin material, which quietly simplifies every border a shipment crosses.

Most importantly for this series, every one of the three is genuinely non-animal from the raw material onward, and ProTec Nutra has never conducted, commissioned or supported animal testing on any of them. The position is identical across the portfolio, and we will confirm it in writing for whichever one you are buying.

That consistency is the point. A buyer should not have to work out which products in a supplier’s range the policy actually covers.

Origin alone is not enough.

Here is where the argument of the last two weeks reconnects, and it applies equally to all three routes. Knowing an ingredient started in algae, a plant sterol or lichen tells you about its raw material. It does not tell you what happened after extraction.

Purification, stabilisation, formulation work, shelf-life studies and the safety or bioavailability data a supplier chooses to generate all happen downstream of the raw material. An ingredient can begin as genuinely plant-source and still acquire animal testing data along the way. Same molecule, same botanical origin, very different story.

Which is why the useful question is never simply where is it from. It is where is it from, and what has been done to it since.

The five questions.

These are the questions we think every buyer should put to any plant-source vitamin D3 supplier, whichever route they are offering, and ourselves included. They take one email to send and they are difficult to answer vaguely.

1. What is the botanical source, and can you document the extraction route from raw material to finished ingredient?
2. Do you hold a written policy stating that no animal testing has been conducted or commissioned on this ingredient?
3. Is that policy signed at company level rather than stated on a website?
4. Can you supply batch-level traceability back to the raw material?
5. Which certifications do you hold, and can you show the audit rather than the badge?

A supplier who has done this work will answer all five without difficulty, because the answers already exist as documents. A supplier who hesitates on any of them has told you something useful. It is not proof of a problem, but it is a reason to keep asking.

Why it is worth doing now.

Vitamin D3 is in the quarter that matters most to it. Stock is moving, reorders are being placed, and next season is being planned. Five questions asked once, at the start of that cycle, is a considerably better position than the same five questions asked in February because a customer or a retailer got there first.

Next week we answer all five ourselves, in order.

To discuss Vitamin D3V^®, EirVit^® or Vitashine for your next formulation, or to request our written animal testing policy, speak to the ProTec Nutra team.