Yarsagumba (Himalayan Caterpillar Fungus): Complete Nepal Guide

Yarsagumba (also spelled yarchagumba) is the Nepali name for Ophiocordyceps sinensis, formerly classified as Cordyceps sinensis, a parasitic fungus of the Himalaya and Tibetan Plateau. Its Tibetan name yartsa gunbu and Chinese name dong chong xia cao both translate as 'summer grass, winter worm', a reference to the way it appears to switch between animal and plant form through the year. In English it is usually called the Himalayan or Chinese caterpillar fungus, and in marketing it is sometimes nicknamed 'Himalayan Viagra'.

Biologically it is neither a true caterpillar nor a plant. The fungus infects the underground larvae of ghost moths (family Hepialidae, mainly the genus Thitarodes) in alpine soil, consuming the larva over winter and mummifying it while preserving its shape. In late spring a slender, dark, finger-like fruiting body (stroma) pushes up above the soil, and it is this stalk-plus-caterpillar unit that collectors dig out, clean and dry.

A finished specimen is a small brown, worm-shaped body a few centimetres long with a darker stalk at one end. It sells by weight, and because each piece is tiny, roughly 2,500 pieces make up a single kilogram. That rarity plus strong demand in China and East Asia turns a Himalayan meadow into a seasonal 'gold rush' every year.

Yarsagumba grows in cold alpine meadows and pastures, typically between about 3,000 and 5,000 metres above sea level; surveys in Nepal record it mostly between roughly 3,540 and 5,050 metres. It cannot be reliably farmed at scale, so the entire trade depends on wild collection from these high, remote grasslands after the winter snow melts.

The presence of Ophiocordyceps sinensis has been reported from around 27 northern mountainous districts of Nepal, concentrated in the far-western, mid-western (Karnali) and Gandaki high country. Dolpa is by far the largest and most famous producing district, often described as supplying a large share of the national harvest. Other important collection districts include Mugu, Jumla, Humla, Kalikot and Jajarkot in Karnali; Darchula, Bajhang and Bajura in Sudurpaschim; and Rukum, Mustang, Manang, Myagdi, Kaski, Lamjung and Gorkha further east.

It is also collected in smaller quantities in central and eastern districts such as Dhading, Rasuwa, Sindhupalchok, Dolakha, Ramechhap, Solukhumbu, Sankhuwasabha and Taplejung. Some of the richest pastures fall inside protected areas, including the Dhorpatan Hunting Reserve, the Annapurna Conservation Area and the Api Nampa Conservation Area, where harvesting is governed by the managing authority rather than a district forest office.

The yarsagumba season is short and tightly tied to snowmelt. Collection typically runs from mid-May to late June, when the fruiting bodies emerge and before summer growth hides them in the grass. Exact opening dates are set each year by district and local authorities: in 2025, for example, Dolpa officially opened collection on 18 May with 62 designated collection sites, while neighbouring Mugu opened on 26 May.

When the season opens, tens of thousands of people, including entire families and seasonal migrants from lower villages, move up to temporary tent camps in the high pastures. Collectors spend hours each day crawling across the meadow at 4,000 metres or more, scanning the ground for the tiny dark stalk. It is physically brutal, high-altitude work, and the season regularly brings reports of deaths from altitude sickness, exposure, avalanches and, in the past, violent disputes between rival groups over prime pastures.

Timing matters because the resource is finite. Opening too early damages immature fungus and the meadow; opening too late loses pieces to grazing and growth. Local governments therefore try to fix the window, register collectors and close the pastures once the season ends to allow regeneration.

Yarsagumba collection is legal but regulated. Collectors are generally required to obtain a permit and pay a fee, and the harvest is subject to a government royalty. Since Nepal's move to federalism, much of the day-to-day permitting has shifted to rural and district authorities, so exact charges vary by place and change from year to year. As an illustration, in 2025 Mugumkarmarong Rural Municipality in Mugu charged about Rs2,000 for local residents and Rs2,500 for outsiders to collect.

These permit fees are a significant source of local revenue. The Kathmandu Post reported that Dolpa collected roughly Rs6.95 million from about 7,000 registered collectors in a recent season. On top of the local permit, a per-kilogram royalty applies when the fungus is traded and moved on. The federal royalty has changed repeatedly over the years, and in protected areas the managing authority sets its own rate; figures cited in recent reporting range from around Rs20,000 to over Rs50,000 per kilogram depending on the area and the stage (collection versus export). Treat any single rate as indicative and check the current year's official notice.

In practice the system is layered and sometimes overlapping: a collector pays a permit fee to the local government, traders pay royalties, and conservation areas levy separate charges. Studies of yarsagumba governance note that conflicting rules between federal, provincial, local and protected-area authorities can create confusion over who collects what, and a large share of trade still moves through informal channels toward the Chinese market.

Yarsagumba was once banned outright. Under earlier forest rules of the 1990s, collection was prohibited and people caught with the fungus could be fined. The ban was lifted around 2001 (2058 BS), when the regulations were amended to permit collection and use in return for a royalty, and a legal trade has existed since. Today the activity sits under the Forest Act 2076 (2019 AD) and the Forest Regulation 2079 (2022 AD), administered by the Ministry of Forests and Environment together with local governments and protected-area authorities.

Yarsagumba is treated as a controlled, high-value non-timber forest product. Government policy restricts exporting it in raw, unprocessed form: as with several protected Himalayan medicinal species, export is permitted only after value is added or processing is done inside Nepal, and only with the required permits and documentation. The intent is to capture more value domestically and to keep the trade traceable, though in reality large volumes are believed to cross informally into Tibet/China.

Anyone planning to trade or export should rely on the current legal text and official notices, because rates, species lists and procedures are periodically revised. The Forest Regulation 2079 published by the Nepal Law Commission is the primary reference, alongside the collection notices issued each season by the relevant district, municipality or conservation-area office.

Yarsagumba has been used for centuries in traditional Tibetan and Chinese medicine, where it is prized as a general tonic and restorative. It is most famous as a claimed aphrodisiac and stamina booster, which is where the 'Himalayan Viagra' nickname comes from. Traditional practitioners have also used it for conditions affecting the lungs and kidneys, for fatigue and recovery after illness, and as an all-purpose 'strength' tonic; it is typically consumed as a whole dried piece steeped in tea, soup or alcohol, or ground into powders and capsules.

Modern marketing extends these claims to immunity, athletic performance, anti-ageing and more. The scientific evidence, however, remains limited and mostly preliminary. Laboratory and cultured-Cordyceps studies point to bioactive compounds such as adenosine and polysaccharides, but the popular claim that O. sinensis contains cordycepin has been questioned by more rigorous analyses, and there are few robust human trials confirming the marketed health benefits.

For readers, the honest position is that yarsagumba is culturally and economically important and widely believed to be beneficial, but its specific medical claims are not well established by high-quality clinical evidence. Because it is extremely expensive, the market is also prone to adulteration and fakes. Anyone considering it for a health reason should treat product claims with caution and consult a qualified health professional.

Yarsagumba is one of the most expensive natural commodities in the world by weight, and its price swings sharply with the harvest, the Nepal-China border situation and demand. The figures below are dated snapshots for orientation only, not a live rate; the true price depends heavily on grade (size, cleanliness and whether pieces are whole).

At the collection level in 2025, reporting placed prices at Dolpa collection points in the region of Rs1.8-2.2 million per kilogram, with collectors often selling small quantities at around Rs1,000 per piece or less. Later in 2025, some Dolpa traders reported selling at roughly Rs2.7 million per kilogram, up from about Rs2.2-2.5 million the previous year. For comparison, before the Covid-19 pandemic bulk prices had reached around Rs3.2 million per kilogram, and in international markets premium pieces have historically fetched tens of thousands of US dollars per kilogram, with exceptional Beijing prices above US$140,000 per kilogram reported in 2017.

The wide gap between the high-pasture price and the eventual retail or export price reflects transport from remote districts, cleaning, sorting and grading, royalties and documentation, and the many middlemen in the chain. Because the numbers move every season, always read a price as of a specific date and district rather than as a fixed value.

Yarsagumba's value has drawn ever more collectors into the mountains, and the harvest shows clear signs of strain. The International Union for Conservation of Nature (IUCN) assessed Ophiocordyceps sinensis as Vulnerable in 2020, with a decreasing population trend, citing overexploitation and habitat pressure; some assessments estimate population declines of well over 30% across recent generations.

A widely cited 2018 study in the Proceedings of the National Academy of Sciences (PNAS) by Hopping and colleagues, drawing on data spanning nearly two decades and four countries, concluded that caterpillar-fungus production is declining across much of its range. Collectors most often blame overharvesting, but the researchers found that climate change is also a major driver: the fungus is most productive in colder conditions near permafrost, so warming winters are shrinking suitable habitat, a 'double whammy' for the species.

Nepali reporting reflects the same trend on the ground. The Kathmandu Post has reported recorded exports falling from over 1,200 kilograms in 2018-19 to a few hundred kilograms in recent years, and collectors describe thinner yields and warmer, drier winters. Botanists point to reduced snowfall, human encroachment, deforestation and unsustainable harvesting.

Conservation responses include enforcing the season window, registering collectors, closing pastures for regeneration, curbing immature harvesting and research into cultivation. But governance gaps, the economic incentive and a warming climate make sustainable management genuinely difficult, and the long-term security of the yarsa harvest is far from guaranteed for the households that depend on it.