Can You Drink Chaga Tea Every Day? Amounts and the Oxalate Question

You can drink chaga tea every day, but no clinical trial has tested daily chaga in people for any outcome or any length of time, and three published cases of kidney failure followed daily chaga powder, 3 to 15 g a day, taken for three months to five years, one in a man also taking 500 mg of vitamin C a day.^{1, 2, 3} Chaga is one of the highest-oxalate foods ever analysed: the powder measured in the 2020 Korean case held 14.2 g of oxalate per 100 g.² Keep to the serving on the label, which for chaga extract powders sold in the UK is typically about 3 g a day (two level teaspoons). Do not take a vitamin C supplement alongside it. And if you have kidney disease or a history of kidney stones, leave chaga alone unless a doctor says otherwise. Chaga contains no caffeine. The evidence for every mushroom sold as a supplement is set out species by species in do mushroom supplements work.

Sources checked on 29 October 2026.

Can you drink chaga tea every day?

Yes: people in Russia, Finland and the Baltics have drunk it as an everyday brew for generations. What a daily drinker should know is that chaga has never been through a randomised clinical trial in people: a PubMed search on 29 October 2026 for chaga studies in volunteers or patients returned only cell and animal studies and the kidney case reports.⁴ So no trial shows that daily chaga does anything measurable, or that it is harmless. The one documented hazard is oxalate. Chaga's main organic acid is oxalic acid, and the three commercial powders that have been measured held 2.8, 11.2 and 14.2 g per 100 g.^{2, 5} In large, sustained amounts oxalate forms calcium crystals inside the kidney tubules, which is what all three biopsies showed.^{1, 2, 3} The practical rule is dose and duration: the reported cases involved raw powder at 3 to 15 g a day, for three months to five years.

How much chaga a day, as powder or tea?

There is no trial dose for chaga, so any figure you see online is a guess. The only numbers that exist are the label serving and the case reports. Chaga extract powders sold as food supplements in the UK typically state about 3 g a day, roughly two level teaspoons stirred into a hot drink; chaga chunks and tea bags state their own steeping amounts. Stay inside the label figure, and know that the lowest amount in the case reports, 3 g of raw powder a day for four years, is the same as that label serving.² A water-and-ethanol extract does not hold the same oxalate as raw ground chaga, but published oxalate figures for extracts are scarce, so nobody can tell you that an extract serving sits "below the danger level".

Does chaga have caffeine, and will it give you energy or keep you awake?

Chaga contains no caffeine. It is a fungus that grows on birch, not a leaf from the tea plant, and caffeine is not among the compounds that chemical analyses of chaga have found.⁵ A "chaga tea" with caffeine in it has been blended with tea or coffee. Chaga has not been tested in people for energy, tiredness, alertness or sleep, so neither the "morning boost" nor the "calming evening cup" has anything behind it; if you swap coffee for chaga, any change in the first week is at least as likely to be the missing caffeine. The GB nutrition and health claims register carries no entry for chaga, so a product that promises energy, focus or restful sleep is making a claim the rules do not allow.⁶

How do you make chaga tea and what does it taste like?

With powder: stir the label serving into about 250 ml of hot, not boiling, water or into your tea or coffee, and drink it with the sediment or let it settle. With dried chunks: simmer a small handful gently in a litre of water for 30 to 60 minutes until the water is the colour of strong black tea. Whether heat "destroys" chaga is argued both ways online; no study has measured it. Chaga tastes mild and earthy with a slight bitterness. On the rules: stirring a chaga supplement into your own drink is the permitted use in Great Britain, where chaga is treated as a novel food except when sold broken or as a water or ethanol extract in a food supplement, a position inferred from the EU and Finnish Food Authority determinations; chaga as an ingredient in a manufactured coffee, chocolate or protein powder would need novel-food authorisation first.⁷

Do you eat chaga, or can you eat it raw?

Nobody eats chaga as a food. The part harvested is the sclerotium, a dense, woody black growth on the birch trunk with a rust-orange interior, as hard as bark. Raw powder carries the full oxalate load, because nothing has been extracted from it; brewing, which draws the water-soluble compounds (oxalic acid among them) into the drink, or taking an extract, is how it is used.⁵

When is the best time to drink chaga?

Any time you like: no trial compares morning with evening, there is no caffeine to time around, and no measured effect on sleep in either direction. Have it with or after food if it unsettles an empty stomach. And do not take a vitamin C supplement with it: part of a vitamin C dose is converted to oxalate, and the third kidney case involved 500 mg of vitamin C a day on top of the chaga.^{3, 10} If you drink it every day, make it one serving at one time of day rather than a cup every few hours.

How long can you drink chaga for?

No trial of any duration exists, while the harm that has been published came from long daily use. The 72-year-old woman in the first report had taken 4 to 5 teaspoons of powder a day for six months; the 49-year-old man took 3 g of chaga powder a day for four years and 9 g for a fifth, for a skin condition, and reached end-stage kidney disease; the 69-year-old man had taken 10 to 15 g a day with vitamin C for three months before an acute kidney injury that needed dialysis.^{1, 2, 3} A 2026 rat study that fed chaga powder at doses extrapolated from one of those cases found oxalate crystals and tubular injury in the kidneys at the higher dose.⁸ So if you drink chaga daily: keep to the label serving, drink water across the day, skip vitamin C supplements, take a break of a few weeks every few months, and stop and see a GP for pain in the side or lower back, blood in the urine, swollen ankles or foamy urine. Anyone with kidney disease, a history of kidney stones, or a bowel condition that raises oxalate absorption should not take chaga without medical advice; the NHS kidney stones page lists the symptoms to act on.⁹ The full picture, including the medicines to be careful with, is on can chaga be harmful.

What are the benefits of drinking chaga every day?

Chaga has not been tested in people for any benefit, so the list of things daily chaga "does" is a list of laboratory and animal findings and traditional uses: cell and animal studies have looked at immune markers, blood glucose in diabetic mice, inflammation markers and tumour cell lines.^{4, 5} What those studies have and have not shown, outcome by outcome from skin to weight to mood, is on what is chaga good for. Does chaga get you high answers that question and the drug-test one. Nor is chaga a measured source of vitamin D: no published analysis of the brewed tea gives a figure, and are mushrooms high in vitamin D explains which mushrooms do carry it.

What we don't know

No trial has given chaga to people, so nobody has measured what daily drinking does over weeks or years, and no tested dose or safe upper limit exists.⁴ No published analysis gives the oxalate content of a brewed cup or of an extract powder, so how much of the 2.8 to 14.2 g per 100 g measured in raw powders reaches the drinker is unknown.² Three case reports cannot say how often harm occurs among the many people who drink chaga without incident.

Frequently asked questions

Can I drink chaga tea on an empty stomach?

Yes. No study has compared chaga with and without food. If it leaves your stomach unsettled, have it with or after a meal.

How long does it take to feel the effects of chaga?

No trial has measured any effect of chaga in people, so there is no timeline to give.

How many cups of chaga tea a day?

One serving of powder or one brew of chunks a day, split into more cups if you like; the limit is the quantity of chaga, not the number of cups.

Does chaga tea have vitamin D or magnesium in it?

No published analysis of brewed chaga tea gives a vitamin D or magnesium figure. At a serving of a few grams it is not a meaningful source of either.

How much chaga tincture should you take a day?

There is no trial dose for any form of chaga, tincture included, so follow the label and do not exceed it. A tincture is a water-and-alcohol extract taken by the dropper, and no published analysis gives its oxalate content, so nobody can say it sits below the amounts in the kidney cases.^{1, 2, 3} The tea rules apply unchanged: no vitamin C supplement, breaks, and none at all with kidney disease or a history of kidney stones.

Sources

1. Kikuchi Y, et al. Chaga mushroom-induced oxalate nephropathy. Case report, 1 patient. Clinical Nephrology, 2014. PubMed 23149251.
2. Lee S, et al. End stage renal disease after long-term ingestion of chaga mushroom. Case report and literature review, 1 patient; no conflicts declared. Journal of Korean Medical Science, 2020. PubMed 32419395.
3. Kwon O, et al. Chaga mushroom-induced oxalate nephropathy manifesting as nephrotic syndrome. Case report, 1 patient; no conflicts declared. Medicine, 2022. PubMed 35451393.
4. Ern PTY, et al. Therapeutic properties of Inonotus obliquus (chaga mushroom). Narrative review; no conflicts declared. Mycology, 2024. PubMed 38813471.
5. Glamočlija J, et al. Chemical characterization and biological activity of chaga. Laboratory analysis of extracts; publicly funded. Journal of Ethnopharmacology, 2015. PubMed 25576897.
6. Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register. Updated 19 May 2026. gov.uk.
7. Retained Regulation (EU) 2015/2283 on novel foods, as it applies in Great Britain. legislation.gov.uk.
8. Lee S, et al. Kidney injury induced by high-dose chaga mushroom consumption. Rat study, three groups; no conflicts declared. Journal of Korean Medical Science, 2026. PubMed 41555803.
9. NHS. Kidney stones. Reviewed 17 September 2026. nhs.uk.
10. Massey LK, et al. Ascorbate increases human oxaluria and kidney stone risk. Randomised crossover study, 48 adults. Journal of Nutrition, 2005. PubMed 15987848.

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