Guide
Berberine and vitamin D: taking them together
Berberine and vitamin D are two of the most commonly stacked supplements, though we haven't found a trial testing the combination. Here's what's known about taking them together.
Yes — there's no documented interaction between berberine and vitamin D, and no reason known so far to avoid taking them together. Electric Tiger Berberine is a single-ingredient bark and root extract and doesn't contain vitamin D. We haven't found a clinical trial testing the two together, so what follows is what's known about each on its own rather than about a combined effect.
What vitamin D is
Vitamin D is a fat-soluble vitamin the body makes from sun exposure on skin and gets in smaller amounts from food and supplements. It comes in two supplement forms: D2 (ergocalciferol, usually plant- or fungus-derived) and D3 (cholecalciferol, the form made in skin and used in most supplements). The NIH Office of Dietary Supplements lists the adult RDA as 600-800 IU (15-20 mcg) a day, with higher amounts recommended for adults over 70.
Why the two show up together in searches
Berberine and vitamin D are each among the most commonly taken standalone supplements, which is likely why people search for the pairing — not because a specific combination product exists or has been studied. We haven't found a trial testing berberine and vitamin D as a combination, or a case report or lab study describing an interaction between them.
What our label covers, and what it doesn't
Electric Tiger Berberine's label states 800 mg of berberine HCl extract per two-capsule serving, standardized to 8% — about 73 mg of berberine. It contains no added vitamin D. If you want both, you'd combine it with a separate vitamin D product, taken according to that product's own label directions rather than ours.
Taking them together
We haven't found a documented interaction between berberine and vitamin D. Berberine does affect several liver enzymes and drug transporters used to process other substances — a 2026 review found it inhibits and induces CYP3A4, inhibits CYP2D6 and CYP2C9, and changes several drug transporters, with the clearest documented human interaction being a rise in cyclosporine levels in kidney-transplant patients. We haven't found research showing vitamin D is processed through those same pathways, or any documented case of the two interacting. Berberine is separately advised against in pregnancy and breastfeeding — a laboratory and animal study found it displaces bilirubin from blood proteins, which is why it's not recommended for pregnant women or newborns. If you take a prescription medication, or are pregnant or nursing, talk to a doctor before combining supplements.
Questions people ask
Can you take berberine and vitamin D together?
We haven't found a documented interaction between the two, or a trial that tested them together. Electric Tiger Berberine doesn't contain vitamin D — you'd need a separate product for that.
Does berberine affect how the body uses vitamin D?
We haven't found published research answering this specific question. Berberine's known enzyme and transporter effects are documented for other substances, not for vitamin D.
Related reading: berberine and vitamin K2: taking them together, berberine and medications: what to check, and who should not take berberine.
Sources
- Berberine-Drug Interactions: Mechanisms, Clinical Relevance and Risk Stratification-A Narrative Review A 2026 review named barberry, Chinese goldthread and goldenseal as berberine's plant sources and found it can raise blood levels of some other drugs even though very little berberine itself reaches the bloodstream.
- Displacement of bilirubin from albumin by berberine A laboratory and animal study found berberine displaces bilirubin from blood proteins, which is why it's advised against in pregnancy and in newborns.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
