Browse the site

Start with a goal 40 things people take supplements for — sleep, stress, joints, focus.
Home Get the app
Reishi mushroom

Reishi mushroom

Best for

Reduce insomnia symptoms

Promising early signal 3000 mg/day 4 weeks 1 study, n=48 #6 of 13 studied

Reishi mushroom shows a promising early signal for sleep, while evidence across other outcomes remains too limited to support broader conclusions.

Median effective dose, most-studied outcomes

  • Sleep more easily through the night 3,000 mg 4 wk
Full protocol, 2 outcomes

Risk, worst reported severity

  • congenital anomaly severe
  • stool disorder mild
  • warfarin major
  • afatinib major
All 18 events and interactions

What reishi mushroom actually does

Outcome Effect Evidence Dose Time Rank
Worth watching 1
Reduce insomnia symptoms Promising early signal Less severe insomnia can mean fewer nights spent struggling with sleep.
moderate 		1 RCT 1 papers · n=48 3000 mg 4 wk #6 /13

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

For the early insomnia signal, the studied protocol used 3,000 mg daily for 4 weeks.1 A separate fatigue study used 3,200 mg daily for about four weeks and found no significant improvement, so taking more does not currently look like a reason to expect more energy.1

When and how long

The sleep study evaluated daily use across several weeks, not an occasional dose when you cannot sleep.1 It does not establish an ideal time of day, whether to split the dose, or whether food changes results, so follow the product directions rather than assuming bedtime use is necessary.1

Forms & standardisation

Current sleep evidence does not identify a specific reishi extract, polysaccharide percentage, spore product, or fruiting-body preparation as superior.1 A standardized label can improve consistency between bottles, but standardization is not proof that a product reproduces the sleep result. Reishi products vary substantially in their polysaccharide and triterpene content.2

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Have less fatigue 3,200 mg — 4 wk 1 paper
Sleep more easily through the night 3,000 mg 3,000 mg 4 wk 1 paper 1 sig. endpoint

Adverse events and drug interactions

Safety events

congenital anomaly severe
stool disorder mild
Diarrhea
Headache
Migraine
Upset stomach / lower GI
Worsening fatigue
Worsening GERD

Drug interactions

warfarin major increases effect
afatinib major increases concentration
doxorubicin moderate increases concentration
paclitaxel moderate increases concentration
vincristine moderate increases concentration
docetaxel moderate unknown
cisplatin moderate unknown
cyclophosphamide moderate increases effect
acetaminophen moderate decreases concentration
gefitinib moderate increases concentration
In context

What this is and how it works

  • One randomized study (n=48) reported a positive sleep outcome; effect size and noticeable-change threshold were not provided.1
  • Nine papers reviewed here span 51 outcomes, with sleep representing the strongest reported signal.
  • Evidence remains preliminary because the positive sleep finding comes from a single small study.

Reishi is a tough, glossy mushroom called Ganoderma lucidum. Traditional preparations usually use the mushroom's fruiting body or spores, then turn them into powders, teas, or concentrated extracts.

Reishi contains long sugar molecules called polysaccharides and bitter triterpenes that interact with immune signaling, like adjusting the volume knobs on the body's alarm network rather than flipping one master switch.2 That biology does not yet explain the sleep finding, and researchers have not established a proven sleep-specific pathway in people.1

Bottom line

Reishi is most worth considering if you want to explore an early sleep signal and accept that the evidence rests on limited research.1 Do not choose it for fatigue based on current results.1 People who take warfarin, use cancer medicines, are pregnant, or have a history of liver problems should speak with a clinician before using it.3

Frequently asked

Common questions

Does reishi mushroom help with insomnia?

One small clinical signal found that 3,000 mg daily improved insomnia burden over four weeks, but this is early evidence rather than a settled answer.1

Can you take reishi every night?

The sleep research used daily supplementation for about four weeks, not occasional use on a restless night.1 Reishi also carries meaningful interaction and safety considerations, so check with a clinician before making it a nightly habit.3

Does reishi reduce fatigue?

It does not appear to reduce fatigue based on the reviewed trial at 3,200 mg daily for roughly four weeks. That study found no significant fatigue benefit.1

Sources

Sources

  1. 1. Randomized clinical research on Ganoderma lucidum and sleep outcomes
  2. 2. A randomized, double-blind, placebo-controlled, multicenter study of Ganoderma lucidum polysaccharides in patients with advanced lung cancer (2005) ↑
  3. 3. Reishi

Generated August 27, 2026

Related

More evidence for Reishi mushroom