CBD and Vitamin D: Can You Take Them Together?

Does CBD interact with vitamin D?

No interaction is recorded in the one major checker we could confirm. Drugs.com's report for cannabidiol with vitamin D3 (cholecalciferol) (opens in a new tab) says no interactions were found and no therapeutic duplication warnings apply. It also says the absence of a listing is not proof that none exists.

Both ingredients do have interactions with other things, and those are the ones worth checking.

Vitamin D. The US National Institutes of Health vitamin D fact sheet (opens in a new tab) names four medicine groups: orlistat (it can reduce how much vitamin D is absorbed), some statins (high vitamin D intakes might reduce the potency of atorvastatin, lovastatin and simvastatin), corticosteroids such as prednisone (they can impair vitamin D metabolism) and thiazide diuretics (combined with vitamin D supplements, they might raise blood calcium too high, especially in older adults).

CBD. The EU product information for Epidyolex, the prescription CBD medicine, says CBD is broken down in the liver mainly by the enzymes CYP2C19 and CYP3A4 (opens in a new tab). The same document covers interactions with medicines that block or speed up those enzymes. Our guide to CBD and medication interactions goes through which medicines need caution.

So if you take a prescription medicine, the question to ask a pharmacist is about CBD and that medicine, and vitamin D and that medicine, rather than CBD and vitamin D.

Among supplements, the overlap to watch is other products that also contain vitamin D, because the upper limit counts every source together. The section on how much vitamin D is too much shows how to add it up.

What research has tested CBD with vitamin D?

Three studies have looked at how CBD and vitamin D act together on bone cells and vitamin D handling: one in human dental stem cells and two in rats. We found them through a PubMed search in October 2026 for cannabidiol or CBD combined with vitamin D, D3 or cholecalciferol. It returned 20 records, and most of the others mention the two only in passing.

• Dental stem cells, 2020. A Romanian lab team grew stem cells from a wisdom tooth removed from a 17-year-old (opens in a new tab) with CBD, vitamin D3 or neither, then measured bone-forming markers and calcium deposits. Each of the three cell types responded differently, and two of them laid down the most calcium at low doses of CBD and D3. The authors conclude that CBD and D3 "can enhance osteogenic differentiation of these types of cells under certain conditions and doses".
• Rats, 2022. Rats were fed a vitamin D3-deficient diet, and some were then given CBD. The CBD-treated rats had higher vitamin D receptor levels in the liver and kidney, and higher vitamin D3 metabolites in the blood (opens in a new tab), than deficient rats without CBD.
• Rats, 2022 (published in print 2023). A second study by the same group, with the same diet, found higher mRNA levels for CYP2R1 and CYP27B1 (opens in a new tab), two enzymes that activate vitamin D, and lower levels for CYP24A1, which breaks it down. Vitamin D3 metabolites were more than 60 % higher than in deficient rats without CBD.

These are early studies. The cell work used one donor's tooth, and both rat studies come from the same research group. Human trials of the combination have not been published yet.

How much vitamin D is too much?

In 2023, EFSA set the tolerable upper intake level (UL) for vitamin D at 100 µg a day for adults (opens in a new tab), including during pregnancy and breastfeeding, and for adolescents aged 11 to 17. For children aged 1 to 10, it is 50 µg a day. The UL counts vitamin D from food and supplements together. EFSA notes that European populations are unlikely to exceed it, except regular users of high-dose vitamin D supplements.

Labels use two units. One microgram (µg) equals 40 international units (IU) (opens in a new tab), so 10 µg is 400 IU and the 100 µg UL is 4,000 IU.

Doubling up happens when vitamin D sits in several products at once: a CBD formula with vitamin D, a multivitamin and a separate D3 tablet, for example. To check, add up the µg from every label you take on the same day and compare the total with 100 µg. The NIH notes that a doctor may recommend doses above the upper limit for a period (opens in a new tab) to treat a deficiency, so tell them about every supplement you take.

Our checklist for taking CBD with other supplements goes through other nutrients that can stack up the same way.

Should you take CBD and vitamin D with food?

Vitamin D is fat-soluble. The NIH fact sheet says fat in the gut at the same time enhances vitamin D absorption (opens in a new tab), although some is absorbed without it.

Food changes how much CBD reaches the blood. In healthy volunteer studies listed in the Epidyolex product information (opens in a new tab), taking 750 or 1,500 mg of CBD with a high-fat, high-calorie meal raised peak blood levels about 5-fold and total exposure about 4-fold compared with fasting. The Epidyolex information advises taking it consistently, either always with food or always without.

What can a CBD and vitamin D product claim in the EU?

Health claims on food and supplements are only allowed if they appear on the EU list in Regulation (EU) No 432/2012 (opens in a new tab), under the rules of Regulation (EC) No 1924/2006 (opens in a new tab). The authorised vitamin D claims, word for word, are:

• Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus
• Vitamin D contributes to normal blood calcium levels
• Vitamin D contributes to the maintenance of normal bones
• Vitamin D contributes to the maintenance of normal muscle function
• Vitamin D contributes to the maintenance of normal teeth
• Vitamin D contributes to the normal function of the immune system
• Vitamin D has a role in the process of cell division

Each claim may only be used on a food that is at least a "source of" vitamin D. The nutrient reference value (NRV) (opens in a new tab) for vitamin D is 5 µg, and as a rule a significant amount is 15 % of it.

CBD has no authorised health claim. The list in Regulation 432/2012 has no entry for cannabidiol or hemp extract, and a vitamin D claim does not transfer to CBD or to a product as a whole. The European Commission's nutrition and health claims page (opens in a new tab) explains how the register works.

CBD's legal status is a separate question. EFSA's 2026 statement says CBD products for oral consumption remain unauthorised (opens in a new tab) under the Novel Food Regulation, and the Commission ended several CBD novel food applications in 2026 without authorising them (opens in a new tab). Our overview of CBD rules across Europe covers how countries handle this.

What a CBD and vitamin D label tells you

A label should let you answer four questions without guessing:

1. How much CBD is in one daily serving, in mg? Look for the amount per daily serving, not only the total in the pack.
2. How much vitamin D, in µg and as % NRV? EU rules require supplement labels to show vitamins as a percentage of the reference value (opens in a new tab) as well as the amount.
3. Which form? D3 is cholecalciferol and D2 is ergocalciferol. EFSA's UL covers both forms (opens in a new tab).
4. Which claims sit next to which ingredient? A vitamin D claim should be about vitamin D. Wording that links CBD to a body function is not an authorised claim.

If you want to know what CBD is and how it is made before reading a label, start there.

Who should check with a professional first?

Ask a doctor or pharmacist before adding CBD or extra vitamin D if any of these apply:

• You take any medicine. EFSA says the safety of CBD cannot be established for people on medication (opens in a new tab), and the NIH lists orlistat, statins, steroids and thiazide diuretics (opens in a new tab) as interacting with vitamin D.
• You are under 25, pregnant or breastfeeding. EFSA could not establish CBD safety for these groups.
• You are trying to conceive. The UK FSA does not recommend CBD for this group unless under medical direction (opens in a new tab).
• You already take a high-dose vitamin D supplement (opens in a new tab) or have been told your calcium levels are high (opens in a new tab).

For more on that, see CBD side effects and who should avoid CBD.

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