Chaga vs Cordyceps: Key Differences

Quick answer

Chaga and cordyceps differ most in what has been tested. Cordyceps has two graded findings from small trials at 1 to 4 g a day, both early. Chaga has no trial in people. Their risks differ too: oxalate and kidney damage with daily chaga powder, against a rare liver case and one lead-contaminated powder for cordyceps.^1,2,3,4,5

Key facts

Cordyceps was tested in people at about 1 to 4 g a day for 1 to 12 weeks. Chaga was not tested in people on its own.^1,6,7
Chaga grows on birch and other trees. Cordyceps is the name for fungi that live on insects, and most products are mycelium grown in the laboratory.^8,9
Chaga powders from three companies held 2.8, 11.2 and 14.2 g of oxalate per 100 g, so 3 g a day of the highest supplies about 420 mg.³
LiverTox rates cordyceps an unlikely cause of liver injury, yet a powder with up to 20,000 ppm of lead caused two cases of lead poisoning in Taiwan.^5,9

The two, row by row

Chaga and cordyceps compared^{1,2,3,4,5,6,8,9,10,11}
	Chaga	Cordyceps
What it is	A fungus that lives as a parasite on birch and other trees	The name for several fungi that live on insects, chiefly Ophiocordyceps sinensis and Cordyceps militaris
Form in most products	Ground powder, or a water or alcohol extract	Mycelium grown in the laboratory, such as Cs-4, or Cordyceps militaris
Trials in people	None of chaga on its own	Several small trials of 20 to 79 people each
Daily amount studied	None	About 1 to 4 g, for 1 to 12 weeks
Best grade among its findings	None	Early, for two findings
LiverTox liver rating	No chapter on chaga	Unlikely cause of liver injury
What has been reported	Kidney damage after daily powder, at 3 to 15 g a day where the amount was given	A rare liver condition in one woman after 5 years of daily use, and lead poisoning from one contaminated powder

What each has shown in people

Cordyceps carries two graded findings, both early because the trials were small, short and not always in agreement with one another. Chaga carries none.

May support aerobic exercise capacity at 1 to 4 g a day taken for several weeks; results disagree, including in trained athletes*^1,6,12,13,14

Early evidence

In 20 adults aged 50 to 75, a cultured cordyceps mycelium (Cs-4) at 333 mg three times a day for 12 weeks raised two exercise thresholds by 8.5% and 10.5%, with no change in maximal oxygen uptake. In 28 young adults, 4 g a day of a mushroom blend containing Cordyceps militaris made no difference after 1 week; in the 10 who continued for 3 weeks, maximal oxygen uptake rose compared with placebo. In 22 trained male cyclists, 3 g a day for 5 weeks changed nothing measured. A 2025 meta-analysis of two or three small trials found borderline gains, and a 2026 review called the Cordyceps militaris trials inconsistent.

Amount studied: About 1 to 4 g a day for 3 to 12 weeks

May raise natural killer cell activity, one measure of immune function, in healthy adults; whether this means fewer illnesses was not tested*^2,11,15

Early evidence

In 79 healthy Korean men, 1.5 g a day of Cordyceps militaris for 4 weeks raised natural killer cell activity and lymphocyte growth more than placebo. In 79 healthy adults, 1.68 g a day of a cordyceps mycelium extract (Paecilomyces hepiali) for 8 weeks raised natural killer cell activity by about 39% compared with placebo. In a 40-person trial of a Cordyceps militaris drink, activity rose in men by 4 weeks against their starting level and, compared with placebo, in women by 8 weeks. The trials were small and short, and none counted illnesses.

Amount studied: 1.5 to 1.7 g a day for 4 to 8 weeks

For chaga, the nearest thing we found is a single dose of an herb mixture that was one fifth chaga, given to 20 healthy young men, plus a laboratory test on blood cells. In neither did anyone take chaga alone over a period of time, so neither says what a chaga supplement does.^7,16

Trees, insects and laboratory tanks

Ophiocordyceps sinensis, formerly Cordyceps sinensis, grows on caterpillars in the Himalayan region. The fungus and the dead caterpillar together have been used in traditional Chinese medicine for centuries, and heavy harvesting has made the wild fungus scarce and costly.^9,17,18

Cordyceps militaris is a related species that is grown commercially and costs less than wild Ophiocordyceps sinensis. It contains cordycepin: one mycelium powder used in a trial held 1,373 mg per 100 g.^6,13,15

Water and alcohol extracts of chaga from Finland, Russia and Thailand all contained oxalic acid as their main organic acid, the most in a Russian water extract.¹⁰

The word cordyceps on a label covers more than one thing. The sources we read say that most products sold under the sinensis name are laboratory-grown mycelium rather than the wild fungus. With chaga, the figure that varied from product to product in the one report that measured it was oxalate, from 2.8 to 14.2 g per 100 g across three companies' powders.^3,9

Which question each can answer

Cordyceps is the only one of the two with anything to weigh up. It has small trials with mixed results, a stated usual range of 0.5 to 4 g a day in commercial products, and a liver rating. Chaga has no studied amount, so any figure on a chaga label is the maker's choice with no human trial behind it.^3,9

A third difference is the kind of risk. Chaga's concern is a substance it contains, oxalate, and the reports tie it to daily use. Cordyceps' reported problems are one rare liver case and a contamination event. The first is a single report, and the second tells you about one powder, not about cordyceps in general.^3,4,5

What's in ours

Our Mushroom Complex holds both. Its cordyceps row reads 266 mg of Cordyceps sinensis powder, listed as mycelium, well under the 1 to 4 g used in the trials. Chaga is one of six mushrooms in a 266 mg blend row, listed as a fruit extract, with no share printed. We make no claim for either.¹

Kidney, liver and who should ask first

Oxalate nephropathy, kidney damage from oxalate crystals, has been reported in at least three people who took chaga powder every day for months or years.^3,8,19

No upper limit or safe daily amount has been set for chaga. In the reports that gave amounts in grams, people with kidney damage took 3 to 15 g of powder a day, for 3 months to 5 years.^3,8

Rare: hepatoportal sclerosis, a disorder of the small veins in the liver, in an 81-year-old woman who had taken a cordyceps tablet daily for 5 years. Doctors judged cordyceps a possible cause, and she improved after stopping.⁴

Lead poisoning from contaminated cordyceps powder: two cases in Taiwan, where the powder held up to 20,000 ppm of lead. Blood lead returned to normal after they stopped taking it.⁵

Trials of 1 to 4 g a day reported few side effects. In a 3-month study of 1.05 g a day of a related species, liver and kidney blood tests did not change and no one reported side effects.^2,11,20

Do not take chaga if you have kidney disease or have had kidney stones, unless your kidney doctor agrees³
Ask first about chaga if you take vitamin C supplements, which are another source of oxalate⁸
Ask first about either if you take a blood thinner or antiplatelet medicine, or have surgery planned: a chaga peptide and cordycepin both slowed platelet clumping in laboratory tests^21,22
Ask first about either if you take insulin or another medicine that lowers blood sugar: a chaga polysaccharide and a cordyceps polysaccharide lowered it in mice^23,24
Ask first about cordyceps if you take medicines that suppress the immune system or have an autoimmune condition, or if you have liver disease^2,4
Ask first if you are being treated for cancer, are pregnant or breastfeeding, or are under 18

Questions people ask

Is chaga or cordyceps better?

Neither comes out ahead on the evidence. Cordyceps has two early findings from small trials that do not always agree, chaga has none from people, and each has its own safety questions.^1,7,14

Is cordyceps the caterpillar fungus or a lab-grown product?

Both exist. The wild caterpillar fungus has become scarce and costly, and most products sold as Cordyceps sinensis are mycelium grown in the laboratory, while Cordyceps militaris is a related species grown commercially.^9,17

Which of the two has been linked to kidney damage?

Chaga. At least three people developed oxalate kidney damage after daily powder for months or years. A 3-month study of 1.05 g a day of a related cordyceps species found no change in kidney or liver blood tests.^3,8,20

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Sources

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.