The Growing Interest in Mushroom Supplements
Potential Benefits, Risks, and What the Science Says
Walk through the supplement aisle or scroll through social media and you will probably encounter mushroom supplements. Lion's mane for the brain. Reishi for relaxation. Cordyceps for energy. Turkey tail for immune support. Chaga for antioxidants.
Medicinal and functional mushrooms have been used in traditional practices for centuries, but their growing popularity in the modern wellness world has brought them to an entirely new audience.
But are mushroom supplements truly beneficial, or has the marketing gotten ahead of the science?
The answer is somewhere in the middle. Some mushrooms contain fascinating biologically active compounds and early research is encouraging in certain areas. At the same time, much of the research is still preliminary, studies are often small, and the supplement you purchase may not be identical to the mushroom preparation studied in a clinical trial.
Mushroom supplements deserve neither miracle status nor automatic dismissal. They are an interesting area of nutritional research, but one where quality, expectations, and evidence matter.
What Are Functional Mushrooms?
Mushrooms contain a variety of naturally occurring compounds, including polysaccharides such as beta-glucans, as well as other compounds that vary considerably depending on the mushroom species.
When mushrooms are marketed as "functional" or "medicinal," the terms generally refer to mushrooms being studied or traditionally used for potential effects beyond their nutritional value.
This does not mean that a mushroom supplement is medicine or that it has been proven to prevent or treat disease.
Five Mushrooms You Are Likely to Hear About
1. Lion's Mane
Commonly marketed for: Memory, focus, cognitive health, and nervous system support.
Lion's mane, or Hericium erinaceus, is probably one of the most talked-about mushrooms today, particularly when it comes to brain health.
Researchers have been interested in compounds found in lion's mane, including hericenones and erinacines, and their potential effects on the nervous system.
There is some human research suggesting possible cognitive benefits. For example, a small randomized controlled trial involving adults with mild cognitive impairment found improvements on cognitive testing during supplementation. Other small studies have investigated lion's mane in healthy adults.
However, results have not been consistently impressive. A 2025 randomized placebo-controlled study in healthy younger adults did not find a significant overall improvement in global cognition or mood after an acute dose, although an improvement appeared on one individual performance test.
Where the science stands: Interesting and promising, but we do not yet have enough high-quality human research to conclude that lion's mane reliably improves memory or prevents cognitive decline.
2. Reishi
Commonly marketed for: Stress, sleep, immune health, and general wellness.
Reishi, also known as Ganoderma lucidum, has a long history of traditional use and contains several biologically active compounds, including polysaccharides and triterpenes.
Laboratory and preliminary human research has led to interest in its potential effects on immune function and other areas of health. However, evidence supporting many of the broad claims commonly made for reishi supplements remains limited.
Where the science stands: Biologically interesting, but many popular wellness claims go beyond what current human clinical evidence can firmly establish.
3. Cordyceps
Commonly marketed for: Energy, endurance, exercise performance, and recovery.
Cordyceps has become particularly popular among athletes and people looking for a non-caffeine energy or performance supplement.
Researchers have investigated whether cordyceps preparations may influence oxygen utilization, exercise capacity, and cellular energy pathways. Some studies have reported encouraging findings, while others have found little or no meaningful performance improvement.
Where the science stands: There is enough evidence to justify continued research, but cordyceps should not be viewed as a proven replacement for exercise training, adequate sleep, nutrition, hydration, or recovery.
4. Turkey Tail
Commonly marketed for: Immune support and gut health.
Turkey tail, or Trametes versicolor, contains polysaccharides that have attracted considerable scientific interest.
Certain mushroom-derived preparations, particularly polysaccharide-K or PSK, have been studied as adjunctive therapies in cancer care in some countries. A systematic review of clinical studies involving medicinal mushrooms reported some potentially favorable findings, but researchers also emphasized limitations in study quality and concluded that the overall evidence was insufficient to recommend routine mushroom supplementation for cancer patients.
This distinction is especially important. Research involving a specific standardized mushroom-derived compound in a medical setting does not mean that an over-the-counter turkey tail supplement will produce the same result.
Where the science stands: An active and interesting area of research, but consumers should be extremely cautious about claims that turkey tail can prevent or treat cancer.
5. Chaga
Commonly marketed for: Antioxidant and immune support.
Chaga contains a number of compounds that have demonstrated antioxidant and other biological activity in laboratory research.
The problem is that laboratory activity does not automatically translate into a meaningful health benefit when a person takes a capsule or drinks chaga tea. Human clinical evidence remains much more limited than many marketing claims would suggest.
Where the science stands: Interesting laboratory research, but limited human evidence for many of the benefits commonly advertised.
Why Laboratory Research Isn't the Same as Human Evidence
This is an important concept whenever we talk about supplements.
A substance may show antioxidant, anti-inflammatory, immune-modulating, or neuroprotective activity in a laboratory experiment. That gives researchers a reason to study it further.
It does not automatically mean that swallowing that substance will produce the same effect inside the human body.
Researchers still have to determine whether the compounds are absorbed, what dose is appropriate, whether the effect is clinically meaningful, how long supplementation is necessary, and whether long-term use is safe.
Early research should make us curious. It should not make us certain.
The Supplement Quality Problem
One of my biggest concerns with mushroom supplements is not necessarily the mushrooms themselves. It is knowing exactly what is in the bottle.
Dietary supplements are regulated differently from prescription and over-the-counter drugs in the United States. The FDA does not approve dietary supplements for safety and effectiveness before they are marketed.
Manufacturers are responsible for ensuring their products meet applicable safety, manufacturing, and labeling requirements, while the FDA's regulatory role often occurs after supplements have entered the marketplace.
That makes choosing a reputable product especially important.
What Should You Look for on the Label?
If you are considering a mushroom supplement, don't buy it simply because the front of the bottle promises "brain power" or "immune defense."
Look for:
- The specific mushroom species clearly identified
- A clearly stated amount per serving
- Information about whether the product contains fruiting body, mycelium, or both
- Transparency about extracts and other ingredients
- Independent third-party testing when available
- A manufacturer willing to provide quality and testing information
- Minimal unnecessary fillers or proprietary blends that hide individual ingredient amounts
Fruiting Body vs. Mycelium: Does It Matter?
You may see a lot of debate about whether a mushroom supplement should contain the fruiting body, the visible part we normally recognize as a mushroom, or the mycelium, the network of fungal material from which the mushroom grows.
Both can contain biologically active compounds, but their composition can differ. Mycelium is also sometimes grown on grain, which can become part of the finished product.
Rather than assuming one form is automatically superior, look for transparency. A good manufacturer should tell you what part of the mushroom is being used, how it was grown and processed, and what the finished product contains.
Are Mushroom Supplements Safe?
"Natural" does not automatically mean harmless.
Depending on the mushroom, dose, individual, and product, side effects may include digestive upset, nausea, diarrhea, allergic reactions, or other unwanted effects.
Supplements may also interact with medications or affect people differently depending on existing medical conditions. The FDA specifically advises consumers to discuss supplements with a healthcare professional because supplements can interact with medications, interfere with laboratory tests, or cause problems around surgery.
This is particularly important if you take prescription medications, are receiving cancer treatment, are preparing for surgery, are pregnant or breastfeeding, or have a chronic medical condition.
Should You Take a Mushroom Supplement?
There isn't one answer that applies to everyone.
Some mushroom supplements are genuinely interesting and may ultimately prove useful for specific purposes. But I would be cautious of products promising dramatic improvements in memory, immunity, energy, longevity, cancer prevention, or disease treatment.
Supplements should also remain exactly what their name implies: a supplement to the foundations of health, not a substitute for them.
Before spending money on a mushroom powder promising better energy, ask whether you are consistently sleeping enough. Before relying on a capsule for cognitive health, look at exercise, blood pressure, nutrition, stress, social connection, and sleep. Before looking for an immune "boost," make sure the basics are being addressed.
Those fundamentals may not come in an exciting bottle, but they have considerably more evidence behind them.
The Bottom Line
Mushroom supplements are not magic, but they aren't necessarily meaningless either. Some contain compounds that deserve serious scientific investigation, and early human research in certain areas is encouraging. The key is keeping expectations realistic, choosing quality products, understanding potential risks, and remembering that "promising" is not the same as "proven."
Work With Wendy
Wellness can get confusing when every week seems to bring a new supplement, diet, or health trend. My goal is to help you separate useful information from the noise and focus on realistic lifestyle habits that support your long-term health.
If you're ready to take a practical, personalized approach to your health, stress, nutrition, sleep, and overall wellness, I'd love to work with you.
Sources & Further Reading
- U.S. Food & Drug Administration. FDA 101: Dietary Supplements.
- U.S. Food & Drug Administration. Information for Consumers on Using Dietary Supplements.
- Mori K, et al. Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytotherapy Research.
- Surendran G, et al. Acute effects of a standardised extract of Hericium erinaceus on cognition and mood in healthy younger adults: a double-blind randomised placebo-controlled study. Frontiers in Nutrition. 2025.
- Medicinal Mushroom Supplements in Cancer: A Systematic Review of Clinical Studies. Current Oncology Reports. 2023.
Health Coach Wendy
Wendy Francis, NBC-HWC
Board-Certified Health Coach
healthcoachwendy.com