Is Four Sigmatic legit? Four Sigmatic is a mushroom beverage brand that sells mushroom coffee and cocoa products, including instant Original Mushroom Coffee and Calm Mushroom Cocoa Mix. Its product pages describe the ingredients, serving format, subscription option, and a 60-day money-back guarantee, so you can compare those details with what you want from a daily drink.
Independence note: This site has no business relationship with this brand, receives nothing from it, and has no purchase or affiliate links on this page.
- What it sells: Mushroom coffee, cocoa, and other mushroom-and-adaptogen blends.
- Original Mushroom Coffee: Instant, half-caf coffee with 50 mg caffeine per serving, according to Four Sigmatic.
- Listed mushrooms: Lion’s mane, chaga, cordyceps, reishi, and turkey tail in Original Mushroom Coffee.
- Guarantee: Four Sigmatic says it offers a 60-day money-back guarantee.
- Evidence grade: Emerging for individual mushroom ingredients; the listed brand information does not provide a human study of the finished coffee or cocoa.
What does Four Sigmatic sell?
Four Sigmatic says it has offered mushroom and adaptogen blends for 14 years. Its range includes coffees, creamers, proteins, supplements, teas, and cocoas. For a reader looking specifically for mushroom cocoa, the retailer listings in this guide show Calm Mushroom Cocoa and Calm Mushroom Cacao products made with reishi mushroom.
Its Original Mushroom Coffee is described by Four Sigmatic as organic Arabica instant coffee with lion’s mane, chaga, cordyceps, reishi, turkey tail, vitamin B12, and probiotics. The maker says the product uses fruiting-body extracts rather than mycelium. The instructions say to mix one tablespoon with 8 fluid ounces of hot water; one bag is listed as 30 servings.
If you are comparing mushroom forms, this site’s guide to mushroom beta-glucans explains why the form and label details matter.
What do the listings say about price and reviews?
Prices below were shown on October 12, 2026; check the checkout for today’s price and bundle details. These ratings, review counts, and sales estimates are the Amazon listings’ figures on that date, not a product-quality verdict.
| Listing | Price shown | Listing rating | Listing sales estimate |
|---|---|---|---|
| Calm Mushroom Cocoa Mix, 15 servings | $16.99 | 4.3/5 from 208 reviews | About 800 monthly |
| Calm Mushroom Cacao Mix, 10 count | $15.00 | 4.3/5 from 5,215 reviews | About 700 monthly |
| Mushroom Hot Cacao Mix with Reishi, two 10-packet packs | $22.95 | 4.4/5 from 392 reviews | About 100 monthly |
Four Sigmatic’s Original Mushroom Coffee page lists a one-time price of $50 for 30 servings, or $35 for a first subscription order. The same page says recurring subscription orders receive 20% off, subscriptions can be cancelled at any time, and weekday orders ship within 24 hours.
What are people saying about Original Mushroom Coffee?
Four Sigmatic’s product page displays a 4.7/5 score from 4,431 reviews. The visible customer comments include praise for convenience, taste, travel-friendly packets, and a smooth feel. One customer comment also describes a seizure concern and mentions rhodiola; that is an individual customer account, while the current product description lists the five mushrooms, vitamin B12, and probiotics above. If that ingredient question matters to you, ask support for the current label before ordering.
A Taste of Home writer described its tested ground coffee as tasting like ordinary coffee without an earthy mushroom taste, while noting a slight texture after the drink cooled. That article discusses a different Four Sigmatic coffee format, so use the package in front of you for the ingredients and directions that apply to your choice.
What does research say about the mushrooms in the coffee?
The evidence grade is emerging. That makes it important to keep ingredient research separate from a conclusion about any finished blend.
Memorial Sloan Kettering Cancer Center’s lion’s mane overview says limited clinical data suggest possible memory and mood findings in several groups, including older adults and people with mild cognitive impairment. It also lists abdominal discomfort, nausea, and skin rash among possible side effects.
Memorial Sloan Kettering’s cordyceps overview describes cordyceps supplements as capsules, powders, and liquid extracts, and notes that people taking insulin or other blood-sugar-lowering medicine should speak with their healthcare provider. For turkey tail, its Coriolus overview lists dark stool and fingernail darkening as possible side effects and advises extra care during pregnancy or breastfeeding.
Reishi is relevant to the cocoa listings. Memorial Sloan Kettering lists nausea, insomnia, and liver injury as possible reishi side effects and says reishi may increase bleeding risk with blood thinners. The National Center for Complementary and Integrative Health also notes that supplements can interact with medicines and may pose risks with some medical conditions or before surgery.
For the broader question of brain-related mushroom research, see mushrooms and cognitive health.
Why might mushroom coffee make you feel weird or bloated?
Start with the format you chose. Original Mushroom Coffee is listed as half-caf with 50 mg caffeine per serving, while the cocoa listings are different products with reishi. Caffeine, a new supplement ingredient, your usual coffee habits, and the amount you drink can all matter to how a beverage feels for you.
Bloating is the tight, full, or pressured feeling in your belly. The Cleveland Clinic lists excess gas, constipation, digestive issues, food sensitivities, hormones, and some medicines among possible causes. The NHS lists a fuller-than-usual tummy, discomfort, noises, and more gas as common signs, and suggests regular movement, water, smaller meals, and avoiding lots of fizzy drinks as practical steps.
For a new mushroom drink, the small next step is simple: check the exact product label and serving direction, and take that label to a clinician if you use medicines or have a health concern that could affect your choice.
What is the Four Sigmatic controversy readers may be seeing?
Four Sigmatic’s public product pages make broad statements about focus, energy, stress relief, gut support, taste, and fewer jitters. The useful way to handle those statements is to separate the maker’s product framing from research on each ingredient and from your own needs. The current Original Mushroom Coffee page also includes a customer comment raising a rhodiola-and-seizure concern, even though rhodiola is not included in that page’s current written ingredient description. That is a good reason to confirm the current package label for the exact coffee you plan to use.
Four Sigmatic says Original Mushroom Coffee is certified organic, gluten-free, plant-based, keto, and tested for toxins. It also says it uses fruiting-body extracts. These are maker statements; before buying, the practical check is to ask for current third-party testing records and compare them with the label.
Can you find it in stores or on Amazon?
Four Sigmatic says its mushroom coffee is sold in thousands of U.S. stores, including Whole Foods and Sprouts. Its own product page also says the brand has served more than 400 million cups. The Amazon listings above show that mushroom cocoa products are also available in Amazon’s cocoa category.
Before you order
- Match the format to your routine: instant coffee, ground coffee, cocoa, pods, or another blend are not interchangeable.
- Check the current label for mushroom species, serving size, caffeine, and any added ingredients.
- Ask for third-party testing records if toxin or mold testing is important to your decision.
- Use public FDA resources and FTC resources to check consumer and product-marketing information yourself.
- For a subscription, confirm the recurring price and cancellation steps before checkout.
By MushroomHealthBenefits.com Research & Editorial Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.