Last updated: June 2026
Reishi mushroom (Ganoderma lucidum) is an adaptogenic mushroom with over 2,000 years of use in traditional Chinese medicine — earning the nickname “the mushroom of immortality.” Studied for immune support, stress relief, sleep and antioxidant protection, it’s now one of the most popular functional mushrooms in the UK wellness market.
Evopure Reishi & sleep supplements
What is Reishi mushroom?
Reishi belongs to a class of mushrooms known as adaptogens — herbs, roots and mushrooms used in traditional medicine to help the body adapt to stress and restore balance. It’s a reddish-brown, woody fungus with a shiny, varnished appearance that grows on dead or decaying hardwood trees.
Reishi contains a range of bioactive compounds including polysaccharides (notably beta-glucans), triterpenes and antioxidants, which are believed to underpin its therapeutic properties.
Is Reishi legal in the UK?
Yes — Reishi is legal in the UK and sold as a food supplement. It contains no psychoactive ingredients and can be purchased in health food stores and online. Any health claims must comply with UK regulations and be supported by evidence.
Reishi mushroom benefits
Stress and anxiety relief
Reishi helps regulate the HPA axis — the body’s central stress response pathway — reducing the release of cortisol and adrenaline. One study found participants experienced less anxiety and depression after taking Reishi for 48 weeks, alongside reduced fatigue and improved quality of life.
Read more: 3 best mushrooms for anxiety
Sleep support
Reishi supports sleep by calming the nervous system and supporting NREM sleep duration in research studies. It works through stress reduction rather than sedation — helping the body wind down naturally.
Read more: How to use Reishi for sleep
Immune system support
Reishi’s beta-glucans bind to immune cells like macrophages and natural killer (NK) cells, activating them to identify and neutralise threats. Research in cancer patients found Reishi increased NK cell activity. It may also regulate cytokine production and stimulate antibody production.
Antioxidant protection
Reishi contains compounds believed to enhance antioxidant enzyme activity — protecting cells from oxidative stress linked to ageing and chronic disease.
Anti-inflammatory properties
Chronic inflammation is linked to anxiety, poor sleep and immune dysfunction. Reishi’s anti-inflammatory compounds may help reduce these underlying drivers.
Read more: Medicinal mushrooms for inflammation
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Take the free health quiz →Reishi mushroom side effects
Reishi is generally safe for most people. Possible side effects include:
- Allergic reactions (skin rashes, itching, swelling)
- GI distress — nausea, diarrhoea, bloating at higher doses
- Blood thinning — may increase bleeding risk for those on anticoagulants
- Low blood pressure — beneficial for hypertension but a risk for those already with low BP
Pregnant or breastfeeding women, people with blood disorders, or those on medication should consult a doctor before using Reishi.
How to use Reishi mushrooms
- Powder — blend into smoothies, teas or cacao drinks. Our Reishi Mushroom Complex is a rich cacao blend designed for evening use.
- Tinctures — concentrated liquid extracts, taken orally or added to drinks
- Capsules or tablets — convenient, pre-dosed and consistent
- Tea — simmer dried Reishi in water for 30 minutes, strain, add honey or lemon
- Culinary — add to broths, soups or stews for a nutritional boost
Read more: How to make mushroom tea
Reishi mushroom dosage
No single ideal dosage is established. General guidance:
- Dried mushroom/powder: 1–6 g per day
- Tincture: 0.5–2 mL per day
Always follow the directions on your product. Consult a healthcare professional before using Reishi if you take medication or have existing health conditions.
How long does Reishi take to work?
Effects build over time rather than appearing immediately. Some people notice improved calm or sleep within a few days; for others it takes 2–4 weeks of consistent daily use. Immune and anti-inflammatory benefits typically take longer to become apparent.
Frequently asked questions
Is Reishi legal in the UK?
Yes — it’s sold as a non-psychoactive food supplement. Health claims must be evidence-based and comply with UK regulations.
What are the main benefits of Reishi?
Stress relief, sleep support, immune modulation and antioxidant protection are the most researched benefits, though more human clinical trials are needed to confirm many claims.
How should I take Reishi for sleep?
Most people take Reishi in the evening — 30–60 minutes before bed. A warm cacao or tea blend makes for a pleasant ritual. Our Reishi Mushroom Complex is designed exactly for this.
Can I combine Reishi with CBD or magnesium?
Yes — Reishi, CBD and magnesium work through complementary pathways and are frequently combined for sleep and stress support. Our Sleep CBD Oil and Magnesium Sleep Blend pair naturally with the Reishi Complex.
Who should avoid Reishi?
Those on anticoagulants, with low blood pressure, blood disorders, or who are pregnant or breastfeeding should seek medical advice before using Reishi.
Final thoughts on Reishi mushroom
Reishi is one of the most well-researched functional mushrooms for stress, sleep and immune health. Current evidence is promising but more human trials are needed. Start with a low dose, be consistent, and treat it as part of a broader evening wellness routine alongside good sleep hygiene.
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