How each Fungki Coffee ingredient helps your brain & body

Every ingredient in Fungki Coffee has scientifically proven mechanisms to support your brain, gut, and nervous system.

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Fungki Coffee bag surrounded by lion's mane, reishi, siberian ginseng, coffee and himalayan salt

As Seen In

1. Organic Lion's Mane · [1,500mg] · Fruiting Body

Lion's Mane helps you actually think.

The two compound families inside this mushroom, hericenones and erinacines, stimulate the synthesis of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF): the proteins your brain uses to build, maintain, and repair neurons.

Go deeper here: Docherty et al., 2023 - Nutrients

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1. Organic Lion's Mane · [1,500mg] · Fruiting Body

2. Reishi · [1,500mg] · Fruiting Body Extract

Reishi supports your nervous system for calm focus.

Reishi's triterpenoids, specifically ganoderic acids, have been linked to GABAergic signalling and a reduction in inflammation, which helps your nervous system regulate itself under sustained load.

Go deeper here: Mi et al., 2022 - Nutrients · Chen et al., 2024 - Phytomedicine

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2. Reishi · [1,500mg] · Fruiting Body Extract

3. Siberian Ginseng · [900 mg] · Organic

One of the most-studied adaptogens in the literature.

Eleutherococcus senticosus is a distinct species with its own active compound class: eleutherosides. These act on the HPA axis, the system governing your cortisol response, stress tolerance, and capacity to sustain output under prolonged mental and physical demand. Where stimulants manufacture a spike, eleutherosides work on the regulatory architecture underneath, building the physiological capacity to stay steady across hours rather than borrowing from it.

Go deeper here: Such et al., 2026 - Nutrients · Gębalski et al., 2025 - International Journal of Molecular Sciences

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3. Siberian Ginseng · [900 mg] · Organic

4. Cold Brew Coffee · [44mg Caffeine] · Low-Acid

Cold brewing extracts fewer of the titratable acids responsible for reflux and gastric discomfort after a standard cup - a measurable biochemical difference.

At 44mg, roughly half a standard cup of coffee, you get sustained adenosine blockade without the cortisol overshoot that comes with 100-200mg doses. Jitters, palpitations, and crashes are dose-dependent effects. At the right dose, the mechanism works without the side effects that made you consider switching in the first place.

Go deeper here: Angeloni et al., 2018 - Food Research International · Lee & Lee, 2025 - Ultrasonics Sonochemistry

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4. Cold Brew Coffee · [44mg Caffeine] · Low-Acid

8. Pink Himalayan Salt · [57 mg]

We added salt for both flavor and fluid retention.

Sodium helps your body actually retain the fluids you drink, rather than clearing them before they can do useful work. The same principle behind electrolyte pre-loading in endurance sports.

Go deeper here: Maughan et al., 2016 - American Journal of Clinical Nutrition

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8. Pink Himalayan Salt · [57 mg]

100% Organic Fruiting Body · No exceptions.

The hericenones, erinacines, and triterpenoids that make these ingredients worth including are concentrated in the mushroom itself, not in the mycelium grain substrate that many manufacturers use instead. Myceliated grain is cheaper to produce, lower in active compounds, and frequently undisclosed on the label.

A cup of Fungki Coffee next to the Fungki Coffee bag with lion's mane and reishi mushrooms
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A daily brew with ingredients that actually make a difference for your brain and body.

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Fungki Coffee in summary…

  • 3,000mg of organic fruiting body mushrooms : Lion's Mane and Reishi - 1,500mg each. 100% fruiting body, no grain filler.
  • 44mg of low-acid cold brew caffeine - Alert without anxiety. Sustained without the crash.
  • HPA-axis support - Siberian Ginseng for stress resilience across hours, not a spike.
  • Electrolyte-paired hydration - Himalayan salt so your cup works with your body's fluid balance, not against it.

Vegan

Non GMO

B-Corp Certified

Climate Neutral

Fruiting Body Mushroom

Made in Canada

100% Traceable

Third Party Tested

What People Are Saying…

50,000+ Orders From Happy Customers

I've been looking for this

As someone who can’t do caffeine but loves a warm (+ functional) beverage, I was so happy to find Fungki. Every other mushroom coffee alternative I’ve tried has missed the mark on flavour, but this one is chef’s kiss. Rich, roasty, caramelly, and not even a hint of mushroom. Drinking this for life!!

Haleigh R.

Verified Buyer

Best tasting by far!

Tastes incredible, better than anything out there. I’ve tried ALL the mushroom coffee alternatives and nothing is as smooth and rich and delicious as Rainbo. Plus, it has a serious dose of high quality mushrooms and adoptions that I can feel. So grateful for this product!

Jarret C.

Verified Buyer

Simply the best !!!

This is absolutely the best stuff ever!!! I have tried other types of mushrooms. However I keep coming back to Rainbo.

Denise R.

Verified Buyer

Love Love Loveee

So happy to have added this to my daily routine. Really great for my energy levels throughout the day and it has helped me maintain my nervous system regulation :) Love!

Bisma M.

Verified Buyer