Does Reishi make you sleepy?

There is no authorised UK health claim for Reishi and sleep. Its story is two thousand years of traditional evening use, plus the magnesium and B vitamins often paired with it.

When should I take Reishi?

Most people take it in the evening as part of a wind-down. Follow the label on your product.

Can I take Reishi every night?

Reishi products are generally taken daily as a ritual. Check with your GP if you are pregnant, breastfeeding or taking medication.

The ingredient desk · Last updated 7 October 2026

Reishi for sleep: the honest guide

Should I take Reishi for sleep?

The short answer

Reishi has two thousand years of traditional use as an evening mushroom — it was called the mushroom of immortality in Chinese medicine — but it has no authorised UK health claim for sleep, and neither does any mushroom. What can legally claim is the magnesium and B vitamins often paired with it: magnesium contributes to normal psychological and nervous system function, and magnesium, B5 and B6 contribute to the reduction of tiredness and fatigue. If you want to try Reishi, choose a fruiting-body extract with published batch tests, and make it part of a wind-down rather than a pill for sleep.

Reishi for sleep at a glance

Reishi for sleep at a glance
	The honest version
What it is	Red Reishi (Ganoderma lingzhi), a woody mushroom from East Asian tradition
Traditional use	Two thousand years, as an evening and longevity mushroom
Authorised UK claim	None — for Reishi or any mushroom
What carries approved claims	Magnesium (psychological and nervous system function) and B5, B6 (tiredness and fatigue)
What to look for	Fruiting body extract, dose on the label, published batch certificates

A wind-down, honestly built

A wind-down, honestly built
	In DREAM
Red Reishi	400mg fruiting body extract
Sage	1,000mg dry herb equivalent, a European monastery-garden herb
Magnesium	300mg
Vitamins	B5, B6 and D

The trade-offs

Reishi (Grass & Co. DREAM)

Fruiting body extract with published batch certificates
Paired with magnesium and B vitamins carrying approved claims
Two thousand years of evening tradition

No authorised sleep claim for Reishi itself
400mg is a modest dose compared with some single-ingredient products

Conventional sleep aids

Faster, more obvious effect

Not a habit you build
Some are not for regular long-term use — check with your pharmacist

The verdict

Reishi is a reasonable evening ritual with a long tradition, but no supplement can legally promise sleep in the UK. Build the routine — same time, lights low, capsules with magnesium — and let the tradition do the rest.

Where Grass & Co. loses

If you want the strongest possible Reishi dose, ours is modest: 400mg of extract alongside a full formula. Dedicated high-dose Reishi products give you more of it for less money, without the blend.

Mentioned in this piece

Questions people ask

Does Reishi make you sleepy?: There is no authorised UK health claim for Reishi and sleep. Its story is two thousand years of traditional evening use, plus the magnesium and B vitamins often paired with it.
When should I take Reishi?: Most people take it in the evening as part of a wind-down. Follow the label on your product.
Can I take Reishi every night?: Reishi products are generally taken daily as a ritual. Check with your GP if you are pregnant, breastfeeding or taking medication.

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.