Shroombiosis

Decaf Mushroom Coffee Still Has Caffeine

By Onur Oncer, B.S. · · 9 min read · Updated

Scientifically reviewed by Dr. Danielle Oncer, PharmD (pharmacology, dosing & safety) and Jon Klipstein (supplement formulation expert, Die Tryin Co.).

Short answer

Decaf mushroom coffee is real coffee with most of the caffeine removed and mushroom extracts added — but "decaf" doesn't mean zero. Lab analyses of decaf coffee have found anywhere from none to about 14 mg of caffeine per cup. If you want coffee's caffeine out of the cup entirely, a coffee-free mushroom mix-in is the surest route, because there are no coffee beans in it to begin with.

A cocoa-colored mushroom drink being poured into a ceramic mug in warm daylight.

If you've searched for "decaf mushroom coffee," you're probably trying to get the benefits people talk about with functional mushrooms while keeping caffeine out of the picture — to avoid the afternoon jitters, to protect your sleep from late-day caffeine, for sensitivity, or just because you'd rather not. That's a sensible instinct. But there's one detail the category rarely says out loud, and it changes the answer: decaf isn't zero.

Here's the short version. Decaf mushroom coffee is real coffee with most of its caffeine removed and mushroom extracts added. "Most" is the operative word — decaffeination is a reduction, not an elimination. If your goal is less caffeine, decaf does that well. If your goal is to cut coffee's caffeine out entirely, the surest route is to drink something that never had coffee in it at all.

What is decaf mushroom coffee?

Decaf mushroom coffee starts as ordinary coffee that's been put through a decaffeination process — often the Swiss Water Process, which uses water and filtration rather than solvents — and then has functional mushroom extracts blended in, usually some mix of lion's mane, chaga, reishi, or cordyceps. The base is still coffee. The mushrooms ride along on top of it.

That's the key distinction from a mushroom mix-in, which is a coffee-free powder you stir into whatever you're already drinking. One is decaffeinated coffee plus mushrooms; the other is mushrooms (and, in our case, more) with no coffee involved. That difference is exactly what determines whether coffee's caffeine is gone or just reduced.

Does decaf mushroom coffee have caffeine?

Yes — almost always a little. Decaffeination is defined by how much it removes, not by reaching zero. In the United States, coffee sold as "decaffeinated" generally has to have around 97% of its caffeine taken out, which leaves a residual amount behind.

How much? A 2006 analysis in the Journal of Analytical Toxicology measured the caffeine in decaf coffees pulled from real cafés. The decaf samples ranged from 0 to 13.9 mg of caffeine per 16-ounce serving, and decaf espresso shots came in at 3.0 to 15.8 mg per shot. For context, a regular 8-oz cup of coffee usually carries somewhere around 95 mg — so decaf is dramatically lower, but not none, and the exact amount varies cup to cup and shop to shop.

Why this matters: a few milligrams is nothing for most people. But if you're deliberately avoiding caffeine — because caffeine that late disrupts your sleep, because you're sensitive to even small amounts, or because you simply want a clean break in the afternoon and evening — "a few milligrams, sometimes more, and you can't tell which" is a different proposition from a cup with no coffee in it. The honest framing is that decaf is a low-caffeine drink, and the label is the only place that distinction lives.

Does decaf coffee give you energy?

A little, but not the way regular coffee does. Decaf usually still carries a small dose of caffeine (0 to 13.9 mg per 16-ounce serving in a 2006 Journal of Analytical Toxicology analysis), so any lift may come from that dose, from other compounds in coffee and from the habit of the cup itself.

That small dose can count. Caffeine doses as low as 12.5 mg changed reaction-time and attention scores after a night without caffeine, in a 2000 Psychopharmacology study of 23 people. That's near the top of decaf's range for a 16-ounce serving.

Decaf raised self-rated alertness more than a coffee-flavored placebo, in a 2018 Nutrients trial of 59 healthy adults who drank coffee or tea daily, but only regular coffee (100 mg of caffeine) lowered tiredness ratings. The researchers think compounds in coffee other than caffeine may play a part.

Belief may help too, though the evidence is shaky. People told their coffee was caffeinated did better on attention and speed tests and rated their vigor higher, in a 2011 Appetite study of 88 people, but being told it was caffeinated did not change test scores or withdrawal symptoms in a 2019 Human Psychopharmacology study of 87 regular coffee drinkers. A known decaf gives no such boost.

There is early evidence that the cup itself helps daily coffee drinkers. Decaf eased withdrawal symptoms more than water among 61 heavy coffee drinkers who had skipped caffeine for 24 hours, even when they knew it was decaf, in a 2023 Journal of Psychopharmacology study. Not a full swap. People given decaf still had more withdrawal and lower test scores than people given caffeinated coffee, in the 2019 study. Decaf eases the switch.

For energy that doesn't lean on caffeine, start with our guide to caffeine-free energy and focus.

Those few milligrams in decaf still count if you chose it for a health reason. If you are pregnant, managing a medical condition or taking medication, check with your doctor or pharmacist first.

Decaf mushroom coffee vs. a caffeine-free mushroom mix-in

So how do the two options actually stack up? Here's a side-by-side, written to be fair to both — because they genuinely suit different people.

Decaf mushroom coffee vs. a caffeine-free mushroom mix-in
  Decaf mushroom coffee Caffeine-free mushroom mix-in
Caffeine Reduced, not zero (≈0–14 mg per cup) No added caffeine — there's no coffee in it
Is it coffee? Yes — decaffeinated coffee at its base No — a powder you add to any drink
Coffee taste & ritual Tastes and brews like coffee Earthy / cocoa notes; not a coffee stand-in for flavor
When you can drink it Best earlier in the day (still has some caffeine) Any time, morning or evening
Mushrooms Varies — often a few species, sometimes mycelium-on-grain 7 fruiting-body mushrooms
Pre / pro / postbiotics Rarely included Yes — acacia prebiotic, DE111® probiotic, BPL1® postbiotic
What's on the label Often a single proprietary-blend total Per-ingredient milligrams

Decaf has a real advantage here, too. If the coffee ritual is the part you love — the taste, the warmth, the morning routine built around a mug — a good decaf mushroom coffee keeps that intact while trimming the caffeine. A mix-in doesn't try to be coffee, so it won't scratch that particular itch.

So which one keeps coffee's caffeine out?

Only the option with no coffee in it. That's not a technicality — it's the whole point of the search. Decaf removes most of the caffeine but leaves a variable little behind; a coffee-free mushroom mix-in starts with no coffee, so there's nothing to decaffeinate in the first place.

That's the lane we built Shroombiosis for. It isn't a decaf coffee and it isn't a "mushroom coffee" — it's a caffeine-free powder you mix into whatever you're already drinking, whether that's water, milk, a smoothie, or, yes, your own cup of coffee if you still want the caffeine on your terms. The steady-energy idea behind it leans less on a stimulant and more on the gut, which is a rabbit hole worth following in how your gut shapes focus and energy.

How to choose between them

There's no universal winner here, just a fit. A simple way to decide:

  • Pick decaf mushroom coffee if you love coffee as a ritual and a flavor, you're fine with a small, variable amount of caffeine, and you mostly drink it earlier in the day.
  • Pick a caffeine-free mushroom mix-in if you want no coffee and no added caffeine, you'd like the freedom to drink it any time (including the evening), and you want functional mushrooms plus pre-, pro-, and postbiotics in a single scoop rather than coffee with mushrooms added.

Quitting caffeine altogether? Cut down over 2 to 3 weeks instead of stopping overnight. Here is how to quit caffeine without the crash.

If part of what drew you to mushroom coffee was steady focus without the spike, it's worth knowing that focus doesn't have to come from caffeine at all — see lion's mane and the pharmacology of focus for what the research actually examines, and why dose and extraction matter more than the delivery format.

What to look for on either label

Whichever direction you go, the same handful of details separate a thoughtful product from a marketing exercise — and they apply to decaf coffee and mix-ins alike:

  1. Per-ingredient doses, not just a single blend total, so you can tell how much of each mushroom you're actually getting.
  2. Fruiting body vs. mycelium — the label should say which, because mycelium-on-grain can carry starchy filler.
  3. A third-party Certificate of Analysis you can open and read, not just a "tested" stamp.
  4. Reasonable, structure/function claims — "supports focus," "supports healthy gut flora" — rather than promises to treat or cure anything.

We walk through all of this in detail in how to read a mushroom supplement label, and the reason we include dedicated prebiotics, probiotics, and postbiotics — not just mushrooms — is laid out in the difference between prebiotics, probiotics, and postbiotics.

The honest bottom line

Decaf mushroom coffee is a fine choice if you want most of the caffeine gone and the coffee experience kept. But "decaf" and "caffeine-free" aren't the same word, and the research bears that out — decaf still carries a small, unpredictable amount of caffeine. If you want coffee's caffeine gone entirely, choose something that never contained coffee in the first place.

That's what we make: a caffeine-free, 7-mushroom mix-in with real pre-, pro-, and postbiotics and the full dose of every ingredient on the label. For the four mushrooms decaf blends usually carry, one 8.3 g scoop of our mix-in holds 1,000 mg of lion's mane, 1,000 mg of Cordyceps and 500 mg each of reishi and chaga. You can see exactly what's in it on the science behind the blend, or read the wider guide to functional mushrooms for the whole category in one place.

References

Frequently asked questions

Does decaf mushroom coffee have caffeine?
Yes, usually a small amount. Decaf mushroom coffee is made from decaffeinated coffee, and decaffeination removes most — but not all — of the caffeine. A 2006 analysis in the Journal of Analytical Toxicology measured 0 to 13.9 mg of caffeine per 16-ounce serving of decaf coffee, and 3 to 16 mg in a decaf espresso shot. So most cups have only a few milligrams, but it is rarely truly zero.
Is decaf mushroom coffee caffeine-free?
Not strictly. In the U.S., coffee labeled decaffeinated is generally expected to have around 97% of its caffeine removed (the commonly cited industry standard), which leaves a small residual amount rather than none. So "decaf" means low-caffeine, not caffeine-free. The surest way to keep coffee's caffeine out of a mushroom drink is to choose one with no coffee in it at all, such as a caffeine-free mushroom mix-in.
What is decaf mushroom coffee?
It is decaffeinated coffee with functional mushroom extracts — often lion's mane, chaga, reishi, or cordyceps — blended or brewed in. It is still coffee at its base; the mushrooms are added on top. That is different from a mushroom mix-in, which is a coffee-free powder you stir into a drink of your choice.
How much caffeine is in decaf coffee?
Lab testing found a wide range. In the 2006 Journal of Analytical Toxicology study, decaf coffees from different outlets contained between 0 and 13.9 mg of caffeine per 16-ounce serving, with decaf espresso shots ranging from 3 to about 16 mg. For comparison, a regular 8-oz cup of coffee usually has roughly 95 mg, so decaf is much lower — just not nothing.
Does decaf coffee give you energy?
A little, but not the way regular coffee does. Decaf raised self-rated alertness more than a coffee-flavored placebo in a 2018 trial of 59 daily coffee or tea drinkers, but only regular coffee lowered tiredness ratings. That small lift may come from decaf's leftover caffeine (up to 13.9 mg per 16-ounce serving in a 2006 lab analysis) or from other compounds in coffee.
Is a caffeine-free mushroom mix-in better than decaf mushroom coffee?
It depends on what you want. If you love the taste and ritual of coffee and only want to cut caffeine down, decaf mushroom coffee is a reasonable choice. If you want a caffeine-free cup, the freedom to drink it any time of day, and functional mushrooms plus pre, pro, and postbiotics in one scoop, a coffee-free mushroom mix-in fits better. Neither is wrong — they answer different goals.
Can you drink a caffeine-free mushroom mix-in in the evening?
Yes. Because a caffeine-free mix-in contains no coffee and no added caffeine, the timing is entirely up to you — it fits an evening routine as easily as a morning one.

Read next

Tags caffeine-freebuying guide
Share this with someone Email a friend WhatsApp X Facebook LinkedIn

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.