Somewhere between cold plunging and journaling your nervous system, mushroom coffee became a personality. You've seen it. The earthy little packets. The influencers with their ceramic mugs and their suspiciously calm demeanor. The promise that you can have your caffeine and transcend it too.
So does mushroom coffee work? A little, kind of, in ways far less exciting than the marketing. Most of the energy comes from the caffeine. The mushroom research is small, early, and usually done at doses far higher than what's in your mug. And regular coffee, which has been rigorously studied for decades, is quietly outperforming all of it.
Prefer to listen?
Get Your Diet Sucks wherever you get your podcasts
Join the YDS community on PatreonWhat Is Mushroom Coffee?
Mushroom coffee is usually ground or instant coffee, or sometimes a coffee alternative, blended with powdered "functional" mushrooms. The most common players are lion's mane, chaga, reishi, and cordyceps, though blends vary wildly by brand. The claims vary even more wildly: sharper focus, stronger immunity, less anxiety, better endurance, fewer jitters, possible cancer-fighting properties, and a general vibe of having your life more together than you actually do.
Taking apart wellness products like this one is the entire premise of the Your Diet Sucks podcast. So let's take this one apart.
Mushroom Coffee Benefits: Checking the Claims on the Package
Before going mushroom by mushroom, it helps to interrogate the specific promises printed on the label.
"Sustained energy without the crash." Unsubstantiated. If your mushroom coffee contains caffeine (most do), the energy is coming from the caffeine. If it's a caffeine-free coffee alternative, there's no good human evidence that any of these mushrooms acts as a stimulant at the doses in these products. The crash you get from regular coffee is mostly about timing, dose, and whether you've eaten, not a toxicity problem that lion's mane is heroically fixing.
"Enhanced focus and mental clarity." Weakly supported, heavily overstated. Lion's mane has the most relevant early evidence, which we'll get to. But the human trials are small and short, and "preliminary signal worth watching" and "enhances your focus" are not the same sentence.
"Fewer jitters." Possibly true, for a boring reason. Many mushroom coffees contain less caffeine than a standard cup. Less caffeine means fewer jitters. The mushrooms aren't moderating your nervous system's response to caffeine. You're just getting less of it.
"Gut health support." Plausible in theory, unproven in practice. Mushrooms contain beta-glucans, a type of fiber that may feed beneficial gut bacteria. Whether the small amount in a powdered blend does anything useful is genuinely unclear. If gut health is the goal, a serving of beans or oats, or eating a freaking salad, is doing more documented work for a fraction of the price.
Now let's break it down, shroom by shroom. (Also, all of these sound like characters in a K-Pop Demon Hunters knockoff??)
Lion's Mane Coffee and Focus: What the Research Shows
Lion's mane is the one with the most interesting early evidence. It contains compounds called hericenones and erinacines, which in lab and animal studies appear to stimulate nerve growth factor, a protein involved in maintaining and growing neurons. That sounds impressive. The problem is that most of that evidence comes from petri dishes and mice.
The human trials are small. The most cited one, from 2009, gave 30 older Japanese adults with mild cognitive impairment either lion's mane or a placebo for 16 weeks. The lion's mane group scored better on a cognitive test. Four weeks after they stopped taking it, the improvement faded (Mori et al., 2009). The dose was 3 grams of dried mushroom powder a day, split into twelve tablets. A 2023 pilot study in 41 healthy young adults found that a single 1.8-gram dose made people slightly faster on one attention task an hour later, but a month of daily use produced no clear cognitive benefits, just a non-significant trend toward lower stress (Docherty et al., 2023).
That is the evidence base: a handful of small, short trials with mixed results, at doses most mushroom coffees don't disclose and probably don't reach. Underwhelming, to put it generously. It also hasn't stopped the TikTok mill from churning out an endless river of funky coffee-alternative content.
Cordyceps, Endurance, and That 1993 World Record Story
Cordyceps has a devoted fanbase in endurance sports, largely traceable to one dramatic moment: the 1993 Chinese National Games, when runners coached by Ma Junren shattered world records in the 1,500, 3,000, and 10,000 meters. Ma credited brutal training, turtle soup, and cordyceps. In 2000, several of his athletes were dropped from China's Olympic team after blood tests, and in 2016 a letter attributed to some of his former runners alleged they'd been forced into systematic doping. Which feels relevant.
The actual research on cordyceps and performance is thin. A company-affiliated trial in sedentary adults aged 40 to 70 reported small gains in aerobic capacity after 12 weeks, and a small 2010 study in 20 healthy older adults reported modest improvements in some markers of aerobic fitness (Chen et al., 2010). In trained athletes, the results are null. Five weeks of a cordyceps extract did nothing for aerobic capacity or time-trial performance in endurance-trained cyclists (Parcell et al., 2004), and a cordyceps and rhodiola formula did nothing for cyclists either (Earnest et al., 2004). The proposed mechanism, better ATP production and oxygen use, is plausible in theory. It just hasn't shown up where it would matter to you.
To put it in haiku form:
Sounds good in theory,
the trials mostly said no.
Don't f*cking buy it.
(If you want an endurance supplement that actually has evidence behind it, we covered creatine. And for another viral endurance product with a thin evidence base, see our Nomio review.)
Reishi Mushroom Coffee and Your Immune System
Reishi is the so-called immunity mushroom. It contains beta-glucans and triterpenes, and there's some evidence it interacts with immune cells in ways that show up on lab tests. Whether that translates into meaningful protection against getting sick in healthy people is much less clear.
Most of the human research is in people with cancer. A Cochrane review of five small trials found that reishi, added to chemotherapy or radiation, was associated with modest improvements in some immune markers and quality of life. But the trials were small and poor quality, none measured long-term survival, and the reviewers explicitly did not recommend reishi as a standalone treatment (Jin et al., 2016). The leap from "might help as an add-on during chemotherapy" to "drink this for wellness" is a significant one.
No mushroom in the known universe is doing more for your immune function than the basics: eat enough, sleep enough, manage stress, dismantle late capitalism, pet a dog.
Chaga and Antioxidants
Chaga is marketed mainly as an antioxidant powerhouse. It does contain antioxidants. So does coffee. So do blueberries, dark chocolate, and most vegetables you probably already eat. You know what tastes better than chaga? Basically everything.
The Bioavailability Problem With Mushroom Coffee
Here is the bigger issue with all of this: dose and absorption. Mushroom cell walls are made of chitin, the same material in insect exoskeletons, which makes many of their compounds hard to get at. Traditional preparations use long hot-water or alcohol extractions specifically to break down those walls. A spoonful of powder stirred into your morning brew is not that process. And most brands don't tell you how much of each mushroom you're actually getting, let alone how much of the active compounds. Whether you're getting a meaningful amount of anything is a real open question that most brands are in no hurry to answer.
Mushroom Coffee vs. Regular Coffee
Meanwhile, regular coffee, the thing mushroom coffee is either blended with or positioning itself against, has an extraordinary body of evidence behind it. I say this with a deep bow: THANK YOU, SCIENCE.
Caffeine is one of the best-studied performance aids in sports nutrition. It reliably improves endurance performance, and it helps with reaction time and alertness too (Guest et al., 2021). And in large reviews of observational studies, moderate coffee drinking is associated with lower risk of type 2 diabetes, Parkinson's disease, liver disease, and several cancers (Poole et al., 2017). These aren't fringe findings. They come from studies following hundreds of thousands of people.
The "coffee without the crash" framing behind a lot of mushroom coffee marketing is worth interrogating. For most people, the crash is about caffeine timing and dose and whether you've eaten. If coffee is giving you anxiety or wrecking your sleep, the evidence-based fix is drinking less of it or drinking it earlier (here's what the research says about coffee timing), not adding $25 worth of fungi.
Is Mushroom Coffee Worth It? The Bottom Line
Does mushroom coffee work? Not in the ways the packaging promises. The energy comes from caffeine. The fewer jitters come from less caffeine. Lion's mane has a small, early signal for cognition at doses well above what's in most blends. Cordyceps hasn't helped trained athletes. Reishi's best evidence is as an add-on during cancer treatment, not as a wellness drink. Chaga's antioxidants are available in basically every plant you already eat.
None of this means mushroom coffee is harmful. For most people, it almost certainly isn't. If you like the taste and it fits your budget, enjoy it. But if you're buying it because you believe it's doing something meaningfully different from a cup of regular coffee, the evidence doesn't support that belief at the doses you're actually drinking. The most honest thing you can say about mushroom coffee is that it's probably fine, definitely expensive, and the thing it's blended with already did the heavy lifting centuries ago.
Drink the coffee.
We go this deep on a different wellness product every couple of weeks on the Your Diet Sucks podcast. And if you want the bonus episodes, the recipes, and a community that will happily fact-check your group chat's supplement opinions, come hang out with us on Patreon.
References
Chen, S., Li, Z., Krochmal, R., Abrazado, M., Kim, W., & Cooper, C. B. (2010). Effect of Cs-4 (Cordyceps sinensis) on exercise performance in healthy older subjects: A double-blind, placebo-controlled trial. The Journal of Alternative and Complementary Medicine, 16(5), 585–590. https://doi.org/10.1089/acm.2009.0226
Docherty, S., Doughty, F. L., & Smith, E. F. (2023). The acute and chronic effects of lion's mane mushroom supplementation on cognitive function, stress and mood in young adults: A double-blind, parallel groups, pilot study. Nutrients, 15(22), 4842. https://doi.org/10.3390/nu15224842
Earnest, C. P., Morss, G. M., Wyatt, F., Jordan, A. N., Colson, S., Church, T. S., Fitzgerald, Y., Autrey, L., Jurca, R., & Lucia, A. (2004). Effects of a commercial herbal-based formula on exercise performance in cyclists. Medicine & Science in Sports & Exercise, 36(3), 504–509. https://doi.org/10.1249/01.MSS.0000125157.49280.AF
Guest, N. S., VanDusseldorp, T. A., Nelson, M. T., Grgic, J., Schoenfeld, B. J., Jenkins, N. D. M., Arent, S. M., Antonio, J., Stout, J. R., Trexler, E. T., Smith-Ryan, A. E., Goldstein, E. R., Kalman, D. S., & Campbell, B. I. (2021). International Society of Sports Nutrition position stand: Caffeine and exercise performance. Journal of the International Society of Sports Nutrition, 18(1), 1. https://doi.org/10.1186/s12970-020-00383-4
Jin, X., Ruiz Beguerie, J., Sze, D. M.-Y., & Chan, G. C. F. (2016). Ganoderma lucidum (Reishi mushroom) for cancer treatment. Cochrane Database of Systematic Reviews, 2016(4), CD007731. https://doi.org/10.1002/14651858.CD007731.pub3
Mori, K., Inatomi, S., Ouchi, K., Azumi, Y., & Tuchida, T. (2009). Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: A double-blind placebo-controlled clinical trial. Phytotherapy Research, 23(3), 367–372. https://doi.org/10.1002/ptr.2634
Parcell, A. C., Smith, J. M., Schulthies, S. S., Myrer, J. W., & Fellingham, G. (2004). Cordyceps sinensis (CordyMax Cs-4) supplementation does not improve endurance exercise performance. International Journal of Sport Nutrition and Exercise Metabolism, 14(2), 236–242. https://doi.org/10.1123/ijsnem.14.2.236
Poole, R., Kennedy, O. J., Roderick, P., Fallowfield, J. A., Hayes, P. C., & Parkes, J. (2017). Coffee consumption and health: Umbrella review of meta-analyses of multiple health outcomes. BMJ, 359, j5024. https://doi.org/10.1136/bmj.j5024
