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Four Sigmatic mushroom coffee review

The brand that made mushroom coffee mainstream. Here's what's in the original instant blend.

By The Functional Sip · Updated October 2, 2026
The short answer
Four Sigmatic Original Mushroom Coffee is a medium-roast instant Arabica with functional mushrooms, 30 servings per bag. It tastes like a smooth instant coffee. It's a good pick if you want a mushroom coffee that's easy to make.
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Four Sigmatic
Four Sigmatic
Four Sigmatic Mushroom Coffee
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A sparkling can instead
White Elixir Island Breeze · from $36
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A cup of coffee on a wooden board

What's in it

The original blend is a medium-roast instant Arabica coffee with functional mushrooms; the current bag lists five mushroom ingredients and 30 servings.

How it tastes

Like a smooth, slightly earthy instant coffee. The mushrooms don't taste like mushrooms.

Who it's for

Coffee drinkers who want an instant cup with something extra. If you're trying to cut back on coffee altogether, see our best mushroom coffee guide for lower-caffeine options.

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Prefer a cold sparkling can?

Botanical Brewing's white elixir, Island Breeze, is sparkling mango and passion fruit brewed with white-vein kratom leaf. It isn't a coffee substitute: kratom is a different plant with its own cautions (adults 21+, habit-forming with regular use, not sold in every state).

Questions people ask

Does Four Sigmatic mushroom coffee have caffeine?

Yes, it's made with real coffee.

Does mushroom coffee taste like mushrooms?

No. It tastes like a smooth, slightly earthy coffee.