Mad honey

Honey from rhododendron nectar carrying grayanotoxins, harvested deliberately in the Himalaya and the Black Sea region and used in small quantities. One of very few traditional claims about honey with a confirmed pharmacological mechanism, and a genuine poisoning hazard.

Cultural useLocal living practiceFood Medicine and the bodyReviewed 2026-08-09

Current status

Local living practice

Practised now, in a limited area or by a limited number of communities.

Currently harvested and traded in the Black Sea region and in parts of the Himalaya, with continuing clinical case reports from both, which is unusually direct evidence that the practice is live.

Where the toxin comes from

Several Rhododendron species produce grayanotoxins in nectar. Where a colony forages heavily on them during a concentrated flowering, the honey carries enough to affect a person: nausea, dizziness, low blood pressure and a slowed heart rate, occasionally severe enough to need hospital treatment. Recovery is usual and fatalities are rare.

It is a floral and seasonal phenomenon rather than a property of any bee. In the Himalaya it is associated with spring harvests of Apis laboriosa honey from cliff colonies foraging on rhododendron; around the Black Sea it comes from Apis mellifera on Rhododendron ponticum.

How it is used, and the ancient account

Documented use is in small quantities, taken as a tonic or an intoxicant, and priced well above ordinary honey. The Turkish trade in deli bal is the better documented of the two markets and reaches export.

The safety position

The market

Deli bal from the Black Sea coast is sold domestically and exported at prices far above ordinary honey, and Himalayan spring honey is traded similarly. Both markets are supplied in small quantities and both attract mislabelling, since the premium is attached to a claim about flowering that a buyer cannot verify.

Clinical case reports continue to appear from both regions and from countries importing the honey, which is unusually direct evidence that the trade is live and that the toxin survives the supply chain.

Cultural significance

One of the few honeys valued specifically for a physiological effect rather than for flavour, and one of the few whose reputation is older than any chemistry.

What this page does not claim

That mad honey has demonstrated medical benefits, that a safe quantity can be stated, or that the effect is a property of the bee rather than of the flowers it worked. Marketing claims about blood pressure and potency are not supported.

The claims behind this page

Established evidence

Supported by systematic reviews, meta-analyses or clinical/regulatory guidance. The claim would survive a careful reader checking it.

Established evidence

Honey from rhododendron nectar can contain grayanotoxins in quantities that cause cardiac and neurological effects in people.

Clinical case series from the Black Sea region document bradycardia, hypotension, nausea and syncope after ingestion, with the toxin identified. Regulatory and food-safety guidance treats it as a recognised hazard.

What this does not claim: It does not establish any therapeutic benefit, a safe dose, or that all rhododendron honey is affected. Toxin concentration varies enormously with the flowering, the species and the batch, and that variability is precisely why a dose cannot be given.

Standard for Honey (CXS 12-1981) — Codex Alimentarius Commission, FAO/WHO (1981) · Standards document Link
The World History of Beekeeping and Honey Hunting — Routledge (1999) · Historical text

In short

Grayanotoxins come from rhododendron nectar, not from any particular bee.
Xenophon's account of poisoned soldiers matches modern hospital admissions in the same region.
Dose is unpredictable between batches, so no safe quantity can be stated.

Sources

The World History of Beekeeping and Honey Hunting — Routledge (1999) · Historical text
Asian Honey Bees: Biology, Conservation, and Human Interactions — Harvard University Press (2006) · Monograph
Standard for Honey (CXS 12-1981) — Codex Alimentarius Commission, FAO/WHO (1981) · Standards document Link

How sources are selected and weighted is set out in the sources and evidence policy.