Elderberry Safety & Interactions: Who Should Be Cautious

Elderberry's safety story is unusual in two directions at once.

The handling risk is real and severe — raw berries have sent people to hospital. But once cooked, elderberry is one of the better-tolerated botanicals in common use, with adverse events in trials that are rare, mild, and transient.

The complications lie in between: a small number of documented case reports, three drug interactions, a pregnancy contraindication, and one widely repeated warning that turns out to be less established than most sources imply.

Start With the Non-Negotiable

Memorial Sloan Kettering's About Herbs monograph opens its warnings with the same point every credible source makes: raw or unripe elderberries contain cyanogenic glycosides and must be cooked sufficiently to avoid risk of cyanide toxicity. Leaves and stems contain them too and should not be ingested. Consuming elder bark, leaves, and raw elderberries has caused poisoning.

That's the handling rule, and it's covered in depth in our article on why elderberries must be cooked. Everything below assumes you've cooked them.

Documented Drug Interactions

MSK's professional monograph lists three, and is careful about how strongly to state each.

Antidiabetic drugs. Elderberry has hypoglycemic activity and may have additive effects with diabetes medication. MSK notes the clinical relevance has yet to be determined — this comes from mechanistic work showing elderberry activates PPAR-gamma and stimulates insulin-dependent glucose uptake, not from documented hypoglycemic events in patients. If you take insulin or an oral antidiabetic, mention elderberry to your prescriber and monitor.

Diuretics. Elderberry promotes urination and may have additive effects with diuretic medication. Again, clinical relevance undetermined. The practical concern would be dehydration or electrolyte disturbance rather than anything acute.

Laxatives. Elderberry has documented laxative effects in clinical studies — it was actually tested as part of a phytotherapeutic compound for chronic constipation — so additive effects with laxative medication are plausible. This one has the firmest basis of the three.

Also worth knowing: in vitro work found CYP3A4 inhibition by a multi-herbal commercial product containing both echinacea and elderberry. CYP3A4 metabolizes a very large share of common medications. This is laboratory data on a combination product, not a demonstrated clinical effect, but it's a reason to mention elderberry to a prescriber rather than assume it's inert.

The Immunosuppressant Question

This deserves careful handling, because it's the most repeated elderberry warning on the internet and it's less settled than it sounds.

The reasoning goes: elderberry stimulates cytokine production and immune activity. Immunosuppressants deliberately suppress it. Therefore elderberry could undermine treatment in transplant recipients or people managing autoimmune disease.

That's coherent. It's also not listed among MSK's documented herb-drug interactions — their monograph names antidiabetics, diuretics, and laxatives, and stops there. Some consumer health databases do advise people on corticosteroids or immunosuppressants to avoid elderberry, and people with organ transplants to avoid it entirely.

Meanwhile, a 2021 systematic review in BMC Complementary Medicine and Therapies examining elderberry for viral respiratory illness found no evidence that elderberry overstimulates the immune system. The honest caveat there is that those studies enrolled healthy volunteers and people with acute viral infections — not transplant recipients or patients with chronic autoimmune disease.

Where that leaves you: the interaction is theoretically grounded but not clinically documented. If you take immunosuppressants or have an autoimmune condition, this is a real conversation to have with your specialist rather than a question to settle from a blog. The stakes for a transplant recipient are high enough that caution is warranted even without proof.

Case Reports Worth Knowing

MSK lists three. Case reports describe association, not causation — but they're the mechanism by which rare effects surface at all.

The 1983 poisoning. Eleven people experienced nausea and vomiting, eight with acute gastrointestinal and neurologic symptoms, after drinking juice made from raw elderberries, leaves, and branches. Symptoms included dizziness and numbness; the person who drank the most was hospitalized. This is the handling failure, not a property of properly prepared elderberry.

Acute pancreatitis. A 51-year-old man developed acute pancreatitis following use of black elderberry. His symptoms resolved after treatment with steroids.

Autoimmune hepatitis. A 60-year-old woman with a history of Hashimoto's thyroiditis and medullary sponge kidney developed autoimmune hepatitis during long-term use of elderberry-containing supplements. Her liver function tests normalized after she stopped the supplements and received immunosuppressive therapy.

That last case is the most interesting one, because it sits exactly at the intersection of the theoretical concern above — an existing autoimmune condition, long-term elderberry supplementation, and a new autoimmune presentation. One case doesn't establish a pattern. It does suggest the caution isn't baseless.

Allergy

MSK lists Type I allergy among infrequent adverse reactions. Research has identified a 33.2 kDa elderberry allergen with significant homology to ribosomal inactivating proteins.

Reactions are uncommon relative to how widely elderberry is consumed, but they exist. Anyone with a history of unexplained reactions to fruit preparations should introduce elderberry cautiously.

Pregnancy and Breastfeeding

MSK is more direct here than on most herbs: avoid use during pregnancy or if lactating, due to risk of toxicity and potential gastrointestinal distress.

The National Center for Complementary and Integrative Health frames it as an absence of information rather than a prohibition — little is known about whether elderberry is safe for health purposes during pregnancy or breastfeeding. There are no data on excretion of elderberry components into breastmilk.

Between an explicit contraindication from a major cancer centre and an acknowledged data gap from NIH, the sensible position is to talk to your obstetric provider before using elderberry in any medicinal form during pregnancy or nursing.

Children

Elderberry has been studied in children — one randomized trial examined a preparation for reducing recurrent tonsillitis — but dosing isn't well established and the evidence base overall is small.

Two specific points:

Never raw, and never anything containing leaves or stems. Children are smaller, and the 1983 outbreak demonstrated dose-dependence.

No honey before twelve months. This isn't about elderberry, but elderberry syrup is exactly the product a parent might give a sick infant, and most recipes are honey-based. Infant botulism risk makes that unsafe regardless of what else is in the bottle.

Talk to a pediatrician first.

The Regulatory Record

Elderberry is the only herb in the ordinary wellness cupboard with its own enforcement history, and it's worth knowing what actually happened.

MSK states it plainly: unsubstantiated claims that elderberry prevents or treats various diseases including AIDS, diabetes, flu, and COVID-19 have been halted by the FDA. Their monograph adds the reason it matters — patients may forego or avoid legitimate treatment.

The record includes an FDA seizure of elderberry juice concentrate at a Kansas company in 2011, and multiple warning letters issued during 2020 over COVID-19 claims. NCCIH separately notes that both the FDA and the Federal Trade Commission took action against companies marketing elderberry with unsubstantiated COVID-19 effectiveness claims.

This isn't a safety issue in the pharmacological sense. It's a safety issue in the sense that mattered most: people substituting a berry for medical care.

What Elderberry Was Tested For and Failed

Worth including, because absence of effect is also safety-relevant information.

Randomized trials found elderberry ineffective at improving cardiovascular disease biomarkers and ineffective for improving cholesterol levels, despite both being commonly promoted uses. A 12-week study in postmenopausal women taking an anthocyanin-rich elderberry extract found no alteration in cardiovascular risk biomarkers or liver and kidney function.

The liver and kidney finding cuts both ways: no benefit, but also no evidence of organ toxicity at that dose over that period.

Key Takeaways

• Cook them. Raw berries, leaves, stems, and bark contain cyanogenic glycosides and have caused documented poisoning.
• Three documented interactions: antidiabetic drugs, diuretics, and laxatives. Clinical relevance is undetermined for the first two.
• The immunosuppressant warning is theoretical, not a documented interaction — but the stakes justify caution if you're a transplant recipient or managing autoimmune disease.
• Pregnancy and lactation: MSK lists these as contraindications; NCCIH describes a data gap. Either way, ask your provider.
• Case reports exist for acute pancreatitis and autoimmune hepatitis. Rare, unproven causally, worth knowing.
• Type I allergy is documented though infrequent.
• FDA has halted claims for AIDS, diabetes, flu, and COVID-19. Elderberry is not a treatment for any named disease.

Talk to a Doctor First If You

• Take insulin or antidiabetic medication
• Take diuretics or laxatives
• Take immunosuppressants, corticosteroids, or have received an organ transplant
• Have an autoimmune condition
• Are pregnant or breastfeeding
• Are considering it for a child
• Take any medication metabolized by the liver
• Have a history of allergic reactions to fruits or fruit preparations

And if you develop hives, swelling, wheezing, or difficulty breathing after elderberry, stop and seek medical care.

Why We Publish This

We sell six elderberry products. Writing the article that lists the pancreatitis case report and the FDA seizure is not obviously good marketing.

But this is the herb where the industry's overclaiming has already drawn federal enforcement, and where the actual handling risk is severe enough to be worth stating in full. A customer who reads this and decides to ask their rheumatologist first is exactly the outcome we want.

Frequently Asked Questions

Who should not take elderberry?

Anyone pregnant or breastfeeding, per MSK's contraindication. Anyone taking antidiabetic drugs, diuretics, or laxatives should check with a prescriber, as should people on immunosuppressants or managing autoimmune conditions.

Does elderberry interact with immunosuppressants?

It's a theoretical concern based on elderberry's immune-stimulating activity, not a documented interaction — MSK doesn't list it among established interactions. Given the stakes for transplant recipients, discuss it with your specialist anyway.

Is elderberry safe if I have an autoimmune disease?

Uncertain. A 2021 systematic review found no evidence of immune overstimulation, but those studies didn't include autoimmune patients. There's also a case report of autoimmune hepatitis during long-term elderberry supplementation. Talk to your provider.

Can I take elderberry with diabetes medication?

Ask your prescriber. Elderberry has hypoglycemic activity and may have additive effects, though the clinical relevance hasn't been determined.

Is elderberry safe during pregnancy?

MSK lists pregnancy and lactation as contraindications. NCCIH says little is known. Both point the same direction: ask your obstetric provider.

Can elderberry damage the liver?

There's a single case report of autoimmune hepatitis associated with long-term supplement use, which resolved after stopping. Separately, a 12-week trial found no alteration in liver or kidney function. One case report isn't a pattern, but it's on record.

Is elderberry safe for daily long-term use?

That hasn't been established. Trials studied short courses, typically during acute illness. Long-term daily use sits outside the evidence base.

How much elderberry is too much?

No upper limit has been established for cooked preparations. For raw berries the answer is any amount.

Related Reading

• Why Elderberries Must Be Cooked
• Sambucus nigra vs. Sambucus canadensis: European and American Elder
• Chamomile Safety & Interactions: Who Should Be Cautious
• Echinacea Safety & Interactions: What to Know Before You Brew

Sources

• Memorial Sloan Kettering Cancer Center, Integrative Medicine. Elderberry: Purported Benefits, Side Effects & More. Last updated March 2023.
• National Center for Complementary and Integrative Health, National Institutes of Health. Elderberry: Usefulness and Safety. Last updated November 2024.
• Centers for Disease Control and Prevention. Poisoning from Elderberry Juice — California. MMWR. 1984;33(13):173-174.
• Ramachandran A, Antala D, Pudasainee P, et al. A plausible association between the use of elderberry and autoimmune hepatitis. Cureus. 2022;14(4):e24250.
• Weissman S, Lo A, Patel R, et al. An unusual culprit of drug-induced pancreatitis. Digestive Diseases and Sciences. 2020;65(5):1549-1552.
• Wieland LS, Piechotta V, Feinberg T, et al. Elderberry for prevention and treatment of viral respiratory illnesses: a systematic review. BMC Complementary Medicine and Therapies. 2021;21(1):112.
• Forster-Waldl E, Marchetti M, Schöll I, et al. Type I allergy to elderberry (Sambucus nigra) is elicited by a 33.2 kDa allergen. Clinical & Experimental Allergy. 2003;33(12):1703-1710.
• Curtis PJ, Kroon PA, Hollands WJ, et al. Cardiovascular disease risk biomarkers and liver and kidney function are not altered in postmenopausal women after ingesting an elderberry extract rich in anthocyanins for 12 weeks. Journal of Nutrition. 2009;139(12):2266-2271.

This article is for educational purposes only and is not intended as medical advice. Elderberry is not a treatment or cure for any condition, including COVID-19 or influenza. Never consume raw elderberries or other parts of the elder plant. Talk with your healthcare provider before using elderberry, especially if you are pregnant, nursing, taking medication, or managing an autoimmune condition.