How much reishi should I take?

There is no established UK dose for reishi, and no authorised health claims for it. Follow the product label and start with the manufacturer's stated serving.

Most people tolerate it well, but it may not suit everyone. If you're pregnant, breastfeeding, on medication (especially blood thinners or blood-pressure medication) or awaiting surgery, check with a doctor first.

Should I take reishi in the morning or evening?

Reishi is traditionally an evening mushroom — most people take it as part of a wind-down routine rather than a morning one.

Mushroom School · Last updated 7 October 2026

Best reishi mushroom supplement UK: 5 checks before you buy

What is the best reishi mushroom supplement in the UK?

The short answer

There is no single best reishi mushroom supplement in the UK — the honest answer is that the best one is the one that tells you exactly what you're getting. A good reishi supplement states the part of the mushroom used (fruiting body, ideally), gives a real dose rather than a vague milligram figure, and publishes independent lab results. Reishi is traditionally an evening mushroom, so most people take it as part of a wind-down routine. Grass & Co. uses reishi in Liquid RELAX (1,000mg per 250ml can) and DREAM capsules (200mg fruiting-body extract per capsule with magnesium, sage and vitamins B5, B6 and D) — but if you want a high-dose, single-ingredient reishi extract, a specialist reishi brand will suit you better.

Five checks before you buy a reishi supplement

Five checks before you buy a reishi supplement
Check	What good looks like	What to be wary of
1. Which part of the mushroom	Says 'fruiting body' on the ingredients list	'Mycelial biomass' or no part named — often grain-grown with starch
2. A real dose	A stated milligram amount of extract per serving or per can	Proprietary blends, or a milligram figure that includes the capsule and fillers
3. Extract, not just powder	An extraction ratio or the word 'extract' — hot-water extraction makes the beta-glucans available	Dried and milled mushroom priced like an extract
4. Published testing	Batch certificates of analysis you can read without emailing anyone	'Third-party tested' as a phrase with no documents behind it
5. What it's blended with	Purposeful pairings — magnesium and B vitamins carry permitted claims; reishi itself cannot	Fillers and sweeteners doing the formula's job

Ways to take reishi compared

Ways to take reishi compared
	Reishi capsules (DREAM)	Reishi sparkling drink (Liquid RELAX)	Single-ingredient reishi extract
Reishi per serving	200mg fruiting-body extract per capsule	1,000mg per 250ml can	Often 500–1,000mg+ — check the label
What else is in it	Magnesium, sage, vitamins B5, B6 and D	Ashwagandha, magnesium, B vitamins	Usually nothing — just the mushroom
Best moment	Evening wind-down	The evening swap for an alcoholic or caffeinated drink	Whenever you like, if you know your dose
Taste	None	Lightly sparkling, low sugar	Bitter — traditionally taken as tea

The trade-offs

Blended reishi products (like ours)

Reishi paired with magnesium and B vitamins, which carry permitted UK claims
Easy to build into an evening routine
Batch lab results published

Lower reishi dose than specialist single-ingredient extracts
You're buying a formula, not just a mushroom

Specialist single-ingredient reishi

High doses of reishi and nothing else
Usually detailed about extraction and beta-glucans

No approved UK health claims for reishi itself
Price per serving is often higher
You do the blending yourself

The verdict

If you want reishi as part of an evening routine — with magnesium and B vitamins doing the permitted-claims work — a blended product like DREAM or Liquid RELAX is the easier buy, and you can read our lab results before you spend anything. If you want the highest reishi dose per pound and nothing else in the capsule, a specialist reishi brand is the better fit. Either way, apply the five checks: part of the mushroom, real dose, extract, published tests, and a formula that makes sense.

Where Grass & Co. loses

We don't make a standalone high-dose reishi supplement. Our DREAM capsules carry 200mg of reishi extract per capsule — a fraction of what specialist brands offer — and Liquid RELAX is a drink, not a concentrate. If you want maximum reishi per pound, we lose. And if you want proven effects, no reishi product can honestly promise that: the human evidence is early and there are no authorised UK health claims for reishi itself.

Mentioned in this piece

Questions people ask

What is the best reishi mushroom supplement in the UK?: The best one states the part of the mushroom, a real dose and published lab results. Grass & Co.'s Liquid RELAX (1,000mg reishi per can) and DREAM capsules (200mg fruiting-body extract) suit an evening routine; for a high-dose single-ingredient extract, a specialist reishi brand is the better pick.
How much reishi should I take?: There is no established UK dose for reishi, and no authorised health claims for it. Follow the product label and start with the manufacturer's stated serving.
Is reishi safe?: Most people tolerate it well, but it may not suit everyone. If you're pregnant, breastfeeding, on medication (especially blood thinners or blood-pressure medication) or awaiting surgery, check with a doctor first.
Should I take reishi in the morning or evening?: Reishi is traditionally an evening mushroom — most people take it as part of a wind-down routine rather than a morning one.

More comparisons

Grass & Co. products are food supplements and are not intended to diagnose, treat, cure or prevent any disease. Do not exceed the stated dose. Most products are for adults; CBD is for adults only.