Supplement · Grade B

Elderberry and medications.

Every documented pair, every citation. Below: 2 documented pairs grouped by mechanism.

Elderberry is in the Distil supplement database, evidence Grade B. The page below lists every medication we have explicitly assessed it against.

Elderberry is an extract of Sambucus nigra berries, taken to shorten and soften colds and flu rather than prevent them outright. The evidence is Grade B for immune and respiratory use, with trials showing reduced symptom duration when started early. The honest framing is that this is a short-term, situational tool: best at the first sign of illness or across a single travel or winter window, not something to take all year. Typical dosing is 600 to 900mg of standardised extract acutely, dropping to around 300mg for seasonal maintenance. The interaction point that matters most is immune-related. Because elderberry stimulates the immune system, it should be avoided by anyone on immunosuppressants and excluded entirely in autoimmune conditions, where it may worsen things. One safety note worth repeating: raw elderberries are toxic, so only prepared supplement forms are safe. Practically, keep it as an occasional acute remedy and stop once you are well.

Below are the 2 documented pairs we have explicitly assessed for Elderberry: 2 amber. The pairs cluster around 1 mechanism: Immune-stimulant vs immunosuppressant (precautionary). Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not listed here is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by medication, and the missing-item form at the bottom of the page routes any uncatalogued medication into our next curation pass.

Documented interactions

Immune-stimulant vs immunosuppressant (precautionary)

Amber Ciclosporin

Ciclosporin works by calming the immune system down, which is what stops your body rejecting a transplant or quietens an autoimmune condition. Elderberry is taken to support the immune system and has been shown to stimulate it. There is no proof the two clash in people, but because the stakes with a transplant or autoimmune disease are high, it is safer not to start elderberry while you take ciclosporin without first talking to your transplant or specialist team.

PMID 11399518 · PMID 35409309 · BNF: Ciclosporin

Reviewer-flagged: awaiting clinical-reviewer sign-off.

Amber Tacrolimus

Tacrolimus works by calming the immune system down, which is what stops your body rejecting a transplant or quietens an autoimmune condition. Elderberry is taken to support the immune system and has been shown to stimulate it. There is no proof the two clash in people, but because the stakes with a transplant or autoimmune disease are high, it is safer not to start elderberry while you take tacrolimus without first talking to your transplant or specialist team.

PMID 11399518 · PMID 35409309 · BNF: Tacrolimus

Reviewer-flagged: awaiting clinical-reviewer sign-off.

What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope. Use the checker below to surface any medication, and submit a missing item if you take something we have not catalogued.

Loading database stats…

For adults over 18. This tool gives evidence-graded information, not medical advice. Always discuss changes with your GP, especially if you take any medication, are pregnant, breastfeeding, or have a serious health condition.

Your supplements

Type the supplement name. Click each match to add it.

Your medications

Brand or generic name works. Click each match to add it.

Anything we should know? (optional)

Pick any that apply. We adjust the findings where context changes the answer.

I confirm I am 18 or over. This tool gives evidence-graded information, not medical advice; always discuss changes with your GP or pharmacist.

Add at least one supplement and one medication to check.

Not sure where to start? Try one:

How we decide

How we grade severity, choose what's in scope, and what we exclude.

Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.

Read the full methodology

Your whole stack

Want this checked across everything you take?

This page checks the pairs you enter. The personalised Distil report goes further:

the same graded, cited interaction check across your whole stack, not just the pairs you thought to type in
where your current routine may be leaving you short of your goals
the evidence-backed compounds worth adding, and the ones worth dropping

It's a paid report: £79, or £49 for the first 25 customers. The interactions check is one section of it, and you can read a real one in full before you buy.

See a real sample report

Something missing?

If a supplement or medication you take isn't in our autocomplete, tell us. We go through what people flag every week and add what's missing.

Thanks, that's logged. We go through flagged items every week.

Distil's interactions database is reviewed and updated every quarter. We grade evidence transparently and publish our methodology, including every database change, at /about/methodology. This tool is information, not a substitute for clinical judgement. If you take medication and supplements together, your GP or pharmacist can review your full regimen against your medical history. If you want a full personalised stack reasoned against this same database, the Distil report is the next step up.