Photo: Raphael Treza
"Mad honey" is real, but it is not quite what viral posts describe. It is honey made from the nectar of certain rhododendrons and related plants, and it contains natural nerve toxins called grayanotoxins. In Nepal it is collected from the cliff nests of the Himalayan giant honey bee, Apis laboriosa; in Turkey's Black Sea region ordinary honey bees make it from local rhododendrons. In small amounts it can cause light-headedness and tingling; in larger amounts it causes a dangerously slow heartbeat and low blood pressure. It is not a classic psychedelic, and health authorities advise against eating it.
Here is what the honey is, who produces it, how it affects the body, and why people still risk ropes and cliffs to harvest it.
What mad honey is
Bees do not make the toxin themselves. They collect nectar from plants in the heath family (Ericaceae), above all rhododendrons such as Rhododendron ponticum and R. luteum, whose nectar contains grayanotoxins. When enough of the nectar comes from these plants, the toxins pass into the honey. The result is often darker and reddish, which is why it is also sold as "red honey".
The honey goes by local names: in Nepal it is bhir mauri ko maha, in Turkey deli bal, literally "crazy honey". In the eighteenth century the Black Sea coast exported tonnes of it to Europe, where it was known in French as miel fou. Smaller amounts of grayanotoxin honey have also been found in the eastern United States, where mountain laurel grows, and in parts of the Alps and Pyrenees.
The bee behind the Himalayan honey
The bee in this story, often reported to live "in caves", actually builds its combs in the open, under overhangs on sheer cliff faces. Apis laboriosa, the Himalayan giant honey bee, is the largest honey bee in the world, with workers up to about 3 cm long. It is not the largest bee of all, as some articles claim: that title is usually given to Wallace's giant bee (Megachile pluto), a resin bee from Indonesia's North Moluccas whose females reach about 38 mm.
A. laboriosa lives across the Himalayas, from Nepal and Bhutan to northern India, Yunnan in China, Myanmar, Laos and Vietnam. Most of its nests sit between about 2,500 and 3,000 metres, often on south-west-facing cliffs, and foragers fly as high as 4,100 metres. A single colony's comb can hold up to 60 kg of honey. For years scientists argued whether it was a separate species or a subspecies of the giant honey bee Apis dorsata; genetic work published in 2020 confirmed it as a species in its own right.
Photo: traveladdicts
Prayer flags above the Himalayan valleys: the mountains of Nepal draw trekkers and pilgrims, but the honey cliffs lie lower down, in the forested foothills where rhododendrons bloom in spring.
Honey hunting on the cliffs of Nepal
The best-known harvesters are the Gurung people of central Nepal, who have collected wild cliff honey for generations. The method has changed little. Hunters build fires at the base of the cliff to smoke the bees away, then one climber descends on a ladder of rope with wooden rungs, cuts the comb with long bamboo poles and lowers it in a basket. Harvests take place twice a year, in late spring and in autumn.
Not all of the honey is "mad". The spring harvest, gathered when rhododendrons are flowering at altitude, gives the red honey with intoxicating effects; it sells for several times the price of ordinary honey and is exported to buyers in places such as Japan, South Korea and Hong Kong. The short documentary below follows a harvest and the people who make it.
Photo: Raphael Treza
A hunter climbs a rope ladder toward giant combs on a Himalayan cliff. The work is dangerous, and falls and stings are real risks for the climbers.
The bees are under pressure too. Reports from Nepal describe steep falls in the number of cliff colonies, linked to over-harvesting, new roads and dams, deforestation and landslides.
How grayanotoxins affect the body
Grayanotoxins act on the sodium channels that nerve and muscle cells use to send signals. They bind to the channels when they open and stop them from closing properly, so the cells stay partly "switched on". Much of the effect runs through the vagus nerve, which slows the heart.
Symptoms usually start within minutes to a few hours of eating the honey. Germany's Federal Institute for Risk Assessment (BfR) lists dizziness, nausea, vomiting, sweating, a slow heartbeat and low blood pressure, and sometimes paralysis; other reports describe blurred vision, tingling around the mouth and, in some cases, hallucinations. Severe poisoning can lead to fainting, irregular heart rhythms and loss of consciousness. Most people recover within a day or two with hospital care.
Deaths are rare: a 2015 review of almost 1,200 recorded cases reported none. That does not make it safe. The BfR says no safe amount can be given, because the toxin content varies widely between jars, and in the worst case even a teaspoon can cause symptoms. People with heart disease or those taking blood-pressure medicines are at greater risk. Anyone who feels unwell after eating honey of this kind should get medical help straight away; talk to a doctor rather than relying on folk remedies.
Myths about "psychedelic honey"
"Only one bee produces it." Not true. The toxin comes from the plants, not the bee. Honey bees in Turkey, the Caucasus and elsewhere make grayanotoxin honey wherever rhododendrons dominate the flowers.
"It is a gentle psychedelic." Hallucinations are reported, but they are a sign of poisoning rather than a separate pleasant effect. The main action is on the heart and blood pressure.
"Small doses are healthy." Mad honey has long been used in folk medicine in Turkey for stomach complaints, colds, high blood pressure and as a supposed aphrodisiac, but these uses are not supported by good evidence. Most people treated for poisoning are middle-aged men.
"It is legal everywhere." Rules differ: South Korea banned imports in 2005, and food-safety agencies in Europe treat high grayanotoxin levels as unsafe.
An ancient weapon
Mad honey has a long history. In his Anabasis, the Greek writer Xenophon describes soldiers retreating near Trapezus (modern Trabzon) in 401 BC who ate honey from local hives, then vomited and could not stand; they recovered by the next day. In 65 BC, during the Third Mithridatic War, troops allied to King Mithridates reportedly left toxic honeycombs along the route of a Roman force. Soldiers who ate them were reportedly killed while incapacitated; the geographer Strabo records the loss of three maniples, somewhere between about 480 and 1,800 men.
Those stories explain why the honey still carries an air of mystery. The reality is simpler and less romantic: a powerful plant toxin, carried by bees, collected at great risk by skilled climbers, and best admired rather than eaten.
Sources: BfR: Questions and answers on grayanotoxins in honey; Wikipedia: Mad honey; Wikipedia: Apis laboriosa; Wikipedia: Grayanotoxin; Wikipedia: Megachile pluto; originally reported by True Activist and Curious Meerkat. Photos: Raphael Treza, traveladdicts.
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