Four Sigmatic Protein Coffee Review: 10g Protein, 5g Creatine, Lion's Mane & 60 Calories in One Cup

Disclosure: this review contains affiliate links and is part of Amazon’s Creator Connections program — if you buy through our links we earn a commission at a rate set by the brand. The facts and our assessment below, including the honest trade-offs, are our own and were not written or approved by Four Sigmatic.

Four Sigmatic Protein Coffee stacks 10g of protein, 5g of creatine, collagen, and lion’s mane mushroom into a single 60-calorie cup of medium-roast coffee — with about 100mg of caffeine and just 1g of sugar. The pitch is simple: instead of brewing coffee and then making a separate protein shake and taking creatine, you get all of it in one mix you stir into hot or iced water. Whether that is worth it comes down to whether you actually want those extras in your coffee every day. Below are the verified facts, an honest look at what is really in it (including why it is not vegan), how to drink it, and who should skip it. Browse more high-protein options in the protein snacks directory or work out your daily target with our protein calculator.

What’s in Four Sigmatic Protein Coffee

Each serving is one scoop or packet mixed into hot or cold water. These are the core per-serving numbers, before you add any milk:

The protein is a mix of organic pea protein and grass-fed collagen, with a hint of cinnamon. Because it contains collagen (which comes from cattle), this is not a vegan or vegetarian product — an important difference from plant-only protein coffees. For exact fat, sodium, and the full ingredient list, check the panel on your tub rather than trusting a round number.

What It Actually Is: a Coffee “Stack,” Not Just Protein

The whole point of this product is convenience by combining. A typical morning for a lot of gym-goers is: brew coffee, blend a protein shake, and take a creatine scoop separately. Four Sigmatic Protein Coffee rolls the three together — caffeine to wake up, 10g of protein, 5g of creatine (the single most research-backed supplement for strength and recovery), and lion’s mane, a mushroom often linked to focus. It genuinely tastes like coffee, not like mushrooms or a chalky shake. The trade-off is that you are locked into one combination: if you do not want creatine or caffeine every single day, keeping them separate is more flexible.

Honest Pros and Cons

Why bundling caffeine with your creatine is a real trade-off: creatine works best when you take it every single day, including rest days, and the time of day does not matter — consistency is what keeps it working. Caffeine is the opposite: you often do not want it every day, and about 100mg late in the afternoon or evening can wreck your sleep. Because the creatine here is baked into a caffeinated coffee, taking your daily creatine also means taking the caffeine every time. So on a rest day, in the evening, or if you are cutting back on caffeine, you cannot get just the creatine the way you could with a separate creatine scoop. If you want creatine every day but caffeine only some days, keeping them separate is the more flexible setup.

How to Drink It

Stir one serving into hot water for a normal coffee, or into cold water over ice for an iced protein coffee (the brand recommends the iced version). Add a splash of milk or a milk alternative for a creamier latte — that adds a few calories and a little more protein. Because it already includes 5g of creatine and about 100mg of caffeine, treat one serving as both your creatine dose and your coffee for that part of the day.

Who Should Buy It — and Who Should Skip It

Buy it if you already drink coffee and take (or want to start) creatine, and you like the idea of one simple daily cup instead of three products. Skip it if you are vegan or vegetarian (it contains collagen), you want a full 20–30g protein shake, or you prefer to control your caffeine and creatine separately. This is general information, not medical advice — check with your doctor before adding creatine or new supplements if you have any health conditions.

Where to Buy

Four Sigmatic Protein Coffee is available on Amazon.

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Frequently Asked Questions

How much protein and caffeine is in Four Sigmatic Protein Coffee?

About 10g of protein and roughly 100mg of caffeine per serving, plus 5g of creatine and lion’s mane, for about 60 calories and 1g of sugar.

Is it vegan?

No. Although it uses pea protein, it also contains grass-fed collagen, which comes from cattle — so it is not vegan or vegetarian.

Does it taste like mushrooms?

No. It is built on medium-roast arabica coffee with a hint of cinnamon and is designed to taste like normal coffee, not like mushrooms or a protein shake.

Can I drink it iced?

Yes — the brand specifically recommends it as an iced coffee. Mix it into cold water over ice, and add milk if you want it creamier.

Is 10g of protein enough?

It is a useful top-up, not a full protein serving. If your goal is muscle building you will still want more protein from meals or a 20–30g shake; the coffee works best as a convenient add-on alongside your caffeine and creatine.

Bottom line: Four Sigmatic Protein Coffee is a genuinely convenient way to combine your coffee, 10g of protein, 5g of creatine, and lion’s mane into one 60-calorie cup — best for coffee drinkers who already take creatine and want to simplify their morning. It is not vegan and not a full protein shake, so it complements your protein intake rather than replacing it. Work out how much protein you actually need with our protein calculator or browse more options in the protein snacks directory.