How do you make chaga tea? Put a few small chunks of dried chaga in a pan of water, heat it until it's steaming but not boiling hard, and leave it for 30 minutes to an hour. Strain it, and you'll have a dark, earthy, slightly vanilla-scented tea. The same chunks can usually be brewed two or three times before they're spent. Powder is quicker: steep it like loose tea for a few minutes. Keep it to one or two cups a day, because chaga is very high in oxalate.
Use about 1 to 3 g of chaga chunks per cup, roughly one or two pieces the size of a sugar cube, and keep the water hot but below a rolling boil for 30 to 60 minutes. Lab work found useful extracts across temperatures: a 70°C hot-water extract had the strongest antioxidant activity in one study (Hu 2009), and a six-minute steep of chaga powder in 100°C water performed well in another (Alhallaf 2022). Reuse chunks until the tea comes out pale, usually two or three brews. Chaga is linked to oxalate kidney damage with heavy, long-term use (Lee 2020), so drink one or two cups a day at most.
This is a practical brewing guide. For how chaga fits alongside other mushroom teas, see our hub on how to make mushroom tea. If you're switching from coffee, our guide to chaga as a coffee substitute covers tapering off caffeine.
What Do You Need to Make Chaga Tea?
Very little. You'll need dried chaga, a pan or kettle, water, a strainer and a mug. A kitchen scale helps the first few times so you get a feel for amounts, but you don't need one long term.
Chaga comes in three main forms for tea:
- Chunks: hard, cork-like pieces. They give the richest tea and can be reused. Our chaga chunks are cut to a size that suits a pan.
- Powder: ground chaga. It brews fast but leaves sediment, so it needs a fine strainer or a paper filter.
- Tea bags or coarse granules: convenient, but often less chaga per cup than chunks.
Our comparison of chaga powder vs chunks vs extract explains the trade-offs in more detail.
How Do You Brew Chaga Chunks?
This is the classic method, and it's hard to get wrong:
- Measure. Use about 1 to 3 g of chunks per cup. That's one or two pieces about the size of a sugar cube.
- Add water. Use about 300 ml per cup you want to end up with.
- Heat gently. Bring the water close to a simmer, then turn it down so it steams with only small bubbles.
- Wait. Leave it for 30 to 60 minutes. The water will turn reddish-brown, then dark brown.
- Strain. Pour it through a sieve into a mug. Keep the chunks for the next brew.
Why not boil it hard? A rolling boil drives off water, can make the taste harsher, and isn't needed. Many traditional recipes keep chaga below boiling, around 60 to 80°C, for longer. A slow cooker on its lowest setting does this well over several hours.
Thermos brewing works too. Put a chunk or two in a vacuum flask, fill it with water just off the boil, close it and leave it overnight. In the morning you've got a strong, ready-made tea.
Does the Water Temperature Matter?
Less than people claim. A Japanese study compared chaga extracts made with hot water at 50, 70 and 80°C, and one made with ethanol. They had different lab activities. The 70°C water extract showed the strongest antioxidant activity in one test, while the ethanol extract did better in others (Hu 2009).
A US study of Maine chaga compared lab-made extracts with simple teas. A six-minute steep of chaga powder in 100°C water was among the most active in a cell test of inflammation markers (Alhallaf 2022). So boiling-hot water didn't ruin it.
The takeaway is practical. Hot water below a hard boil is a sensible default, but both gentle and hotter brews extract useful compounds. Lab results in cells also don't tell us what a cup of tea does in a person. Choose the method that suits your routine and gives a taste you like.
How Many Times Can You Reuse Chaga Chunks?
Usually two or three times, sometimes four. Each brew comes out a little lighter. The first is dark and rich, the second is still strong, and the third is noticeably paler. Once the tea comes out light amber after a full brew, the chunks are spent.
Store used chunks in a covered container in the fridge between brews, and use them within two or three days. Don't leave wet chunks at room temperature for days, because they can grow mould. You can also dry them out on a plate in a warm, airy spot if you won't brew again soon.
Some people combine brews to even things out. Simmer the chunks once, pour off the tea, add fresh water and brew again, then mix the two batches. That gives a steadier strength than one very strong cup followed by a weak one.
How Do You Make Chaga Tea From Powder?
Treat it like loose-leaf tea. Put about half a teaspoon of chaga powder in a tea infuser or a cafetière, pour over hot water and steep for five to ten minutes. Strain it well, or let the sediment settle and pour carefully.
You can also simmer powder in a small pan for 10 to 15 minutes for a stronger cup, then strain it through a paper coffee filter. Powder isn't usually reused, because it gives up most of what it has in the first brew. Our chaga powder works for both methods.
How Can You Make Chaga Tea Taste Better?
Chaga's flavour is mild: earthy, woody, a little bitter, with a hint of vanilla. Many people drink it plain. If you want more, try these:
- A slice of fresh ginger or a cinnamon stick in the pan
- A splash of milk or oat milk, latte-style
- A little honey or maple syrup
- A strip of orange peel or a few cardamom pods
- Mixing it half and half with black tea or rooibos
Chaga tea is also good cold. Brew a batch, chill it and serve it over ice with lemon. It keeps for two or three days in a closed jar in the fridge.
How Much Chaga Tea Is Safe to Drink?
One or two cups a day is a sensible limit. The reason is oxalate. Chaga is one of the richest known sources of it, and too much oxalate can damage the kidneys.
In a Korean case, a man developed end-stage kidney disease after years of daily chaga powder, and the leftover chaga held 14.2 g of oxalate per 100 g (Lee 2020). In the first published case, a 72-year-old woman took four to five teaspoons of chaga powder a day for six months and needed dialysis (Kikuchi 2014). Another case presented as nephrotic syndrome (Kwon 2022).
These involved large amounts over months or years, far more than a cup of tea. Still, it's why chaga tea isn't a drink to have all day. Drinking it with a calcium-rich food, such as milk, may reduce how much oxalate you absorb. Our article on mushrooms, oxalates and kidney health explains the risk in full.
Who Should Avoid Chaga Tea?
- People with kidney disease or a history of kidney stones
- People on blood thinners, because chaga may affect clotting
- People on diabetes medicine, because chaga may lower blood sugar
- Anyone due to have surgery within two weeks
- Pregnant or breastfeeding women, because there's no safety data
Our guide to chaga side effects and interactions covers each of these, and our chaga dosage guide compares tea with other forms.
Frequently Asked Questions
How long should I brew chaga tea?
For chunks, 30 to 60 minutes in hot water below a hard boil. For powder, five to ten minutes of steeping, or 10 to 15 minutes of gentle simmering. A slow cooker or overnight thermos also works.
Does chaga tea have caffeine?
No. Chaga contains no caffeine, so you can drink it in the evening. It won't give you the lift that coffee does.
Can I drink chaga tea every day?
One or two cups a day is a reasonable limit for healthy adults. People with kidney problems should avoid it because of its high oxalate content.
Why is my chaga tea red instead of dark brown?
A reddish tea usually means a short or cool brew, or chunks that have been reused several times. Brew longer, use a little more chaga, or start with fresh chunks for a darker cup.
Can I eat the chaga chunks after brewing?
No. Chaga is hard and woody, and it isn't digestible as food. Once the chunks are spent, put them in the compost.
Related Articles
- How to Make Mushroom Tea
- Chaga as a Coffee Substitute
- Chaga Dosage Guide
- Chaga Powder vs Chunks vs Extract
- Chaga Side Effects and Interactions
Sources
- Hu H, Zhang Z, Lei Z, Yang Y, Sugiura N. Comparative study of antioxidant activity and antiproliferative effect of hot water and ethanol extracts from the mushroom Inonotus obliquus. J Biosci Bioeng. 2009;107(1):42-48. PubMed 19147108
- Alhallaf W, Perkins LB. The anti-inflammatory properties of chaga extracts obtained by different extraction methods against LPS-induced RAW 264.7. Molecules. 2022;27(13):4207. PubMed 35807453
- Lee S, Lee HY, Park Y, et al. Development of end stage renal disease after long-term ingestion of Chaga mushroom: case report and review of literature. J Korean Med Sci. 2020;35(19):e122. PubMed 32419395
- Kikuchi Y, Seta K, Ogawa Y, et al. Chaga mushroom-induced oxalate nephropathy. Clin Nephrol. 2014;81(6):440-444. PubMed 23149251
- Kwon O, Kim Y, Paek JH, et al. Chaga mushroom-induced oxalate nephropathy that clinically manifested as nephrotic syndrome: a case report. Medicine (Baltimore). 2022;101(10):e28997. PubMed 35451393