Can You Be Allergic to CBD? Two Papers, One Protein

Can s 3, named in 2007 and again in 2021

Two papers. One plant protein. That is the size of the published record this question mostly rests on, and it is a good deal smaller than the conversation around it.

In 2007, Gamboa and colleagues described sensitisation to Cannabis sativa and traced it to a protein that had not been characterised before. They gave it a formal name: Can s 3. The protein belongs to a group called non-specific lipid transfer proteins, which is a technical way of saying plant protein, the kind of molecule a plant builds for its own purposes and keeps in its own tissue [1].

Fourteen years later, Morelli and colleagues looked at the same molecule on a different continent and described Can s 3 as a relevant cannabis allergen in North America [2]. Two research groups, two regions, one protein with an allergen designation attached to it.

Now read what those sentences cover and what they do not. Both papers deal with a protein from the plant. Neither is about cannabidiol as a cannabinoid, and neither is about a finished oil, capsule or cream. In this literature the allergen is a protein. A cannabinoid sits in a different chemical category, and it does not appear in these two records as the molecule under investigation.

Allergen-characterised is a narrow status. It means a protein has been isolated, named and connected to sensitisation in published work that other researchers can check. It says nothing about how often that happens in the general population, and neither paper offers a frequency figure for people who have never worked with the plant.

One more piece of vocabulary, because it causes half the confusion here. Cannabis sativa is the botanical name that covers hemp, so a paper on cannabis allergy and a bottle of hemp extract genuinely do share a plant. They do not share a subject. The papers examine plant protein. The bottle contains a refined extract and a carrier.

What sits in the bottle besides cannabinoids

A finished hemp product is a mixture, and it helps to split it in two before going further.

On one side, the extract: the concentrated fraction taken from the plant, where the cannabinoid content comes from. On the other, the carrier: the oil that extract is dissolved into so a pipette can deliver a consistent amount. Both are ingredients. Only one of them comes from cannabis at all.

Because Can s 3 is a plant protein [1], the part of an extract that matters for this particular question is the protein fraction, not the cannabinoid percentage on the front of the label. And here the record runs out. Refined extracts carry protein in small quantities, and there is no published figure for how much protein survives the extraction and refining steps [1]. That is an open number, not a reassuring one and not an alarming one. We would rather write that down than fill the gap with confident language.

The carrier side is more straightforward, because it is declared. Hemp seed oil is pressed from hemp seed. It is not a cannabinoid extract, which means a label showing hemp twice is describing two different plant materials that arrived by two different routes. Olive oil is olive oil, familiar from any kitchen. In topical formats the same logic applies with a shift in proportion: the base makes up the large share of what actually reaches the skin, so the base is the first thing worth reading.

Nobody reacts to an abstraction. People react to a product they used, and a product has a list. So the useful move is to stop asking about a category and start reading a specific formula, line by line, including the parts that have nothing to do with cannabinoids.

Olive, hemp seed, bovine gelatin: base by format

Our own range splits along those lines, and the split is public. Cannabinoid content is published per batch. The ingredient list is published per product. Both can be read before anything becomes part of a routine, which is the point of publishing them.

The oils use two different carriers. CBG oil and CBN oil are formulated in olive oil. The CBD Oil 2.0 range uses hemp seed oil, pressed from hemp seed. The capsules add one more component that oils do not have: a softgel shell made from bovine gelatin, which is why they are not suitable for a plant-based diet. That is a composition fact, stated plainly, and it belongs in a conversation like this one alongside the carrier names.

Why we go to this level of detail: composition is the question we can actually answer. We have been working with cannabinoids since 2014, we build to Swiss standards, and the operation runs from Schijndel. None of that tells anyone how their body will respond to a plant protein. All of it tells them what is in the bottle, which is the part a manufacturer owes the reader.

If a formula is under discussion for any reason, the specific document to look at is the ingredient list for that product, not a general page about hemp. Carrier oils differ between our lines. Shell material exists in one format and not the others. General statements about hemp products cannot resolve either.

The part the studies leave open

Three things are documented. Can s 3 has been characterised as a plant protein and a cannabis allergen in Europe [1] and described as relevant in North America [2]. A 2017 review by Iffland and Grotenhermen surveyed cannabidiol safety and reported side effects, which is general safety literature rather than allergy work. Beyond that the ground gets thin quickly.

The general risk profile of finished cannabidiol products has not been established. Anyone describing it in firm terms, in either direction, is going past the available evidence. We will not do that, and the honest version of the answer is a division of labour: composition is ours to publish, and anything about a personal reaction belongs with a doctor or an allergist who can work from your history.

What can be prepared in advance is short and practical. The product name and strength. The carrier oil, olive or hemp seed. The shell material, if the format has one. The batch analysis with its cannabinoid content. Everything else in the ingredient list, including anything not derived from hemp at all. A clinician works from that kind of list, the same way they would with any other food or cosmetic ingredient.

Two research groups have put a name to a cannabis protein. That is real, checkable work, and it is also the whole of what these papers claim. The distance between a named plant protein and a refined extract in olive oil is exactly where the unpublished numbers live, and we would rather point at that space than paper over it.

Since 2014 one rule has applied to everything we bottle: the composition is written down before it reaches anyone's shelf.