"Like millions, I relied on caffeine to get through the day—until I realized it was a crutch. Instead of giving me energy, it left me anxious and burned out. When I couldn’t find a better alternative, I was forced to make one. Px Coffee was born from a simple idea: energy should work with your body, not against it."
— Jeffrey, Founder & CEO
So we worked to identify and solve the 5 main overlooked issues with caffeine:
The 5 Caffeine Misconceptions
1
Caffeine is natural, so our bodies can handle it 🌿
True, caffeine is natural. But... it exists as “nature’s bug spray.” It’s purpose is to protect plants from small animals and insects by overstimulating their nervous systems. For us humans, our bodies can handle it, but we weren’t designed to do it well. In fact genetically, over 50% of people are slow metabolizers, meaning caffeine lingers longer and causes more side effects—like jitters, headaches, disrupted hormones, and more.
2
Caffeine Helps You Focus 🧠
While caffeine can increase alertness, it often leads to overstimulation, anxiety, and poor concentration—especially in high doses or for genetically slow metabolizers. Focus? Not when your heart is racing and your mind’s scattered
3
Caffeine Doesn’t Affect Sleep If You Drink It Early 😴
Caffeine’s half-life is up to 5-6 hours. For many, that “morning cup” can still be active at bedtime, reducing deep sleep even if you fall asleep just fine. Poor sleep = poorer health, memory, mood, and metabolism.
4
Drinking more caffeine gives you more energy ☕
The maximum benefit of caffeine’s alertness boost comes within 30 minutes of your first cup.
The reason your second cup never feels as good as your first? It isn’t making you more alert—it’s just keeping you from crashing while adding to the anxiety, brain fog, cortisol and more.
It borrows energy from “later you” and builds up what is called “sleep debt.” Once it wears off, the crash hits. Hard.
5
Cutting Caffeine Means Giving Up Energy 🧘♂️
Caffeine can flood your system with stress hormones like cortisol, which can feel like energy, but it’s actually just your body’s emergency response. Over time, this can burn out your adrenals and hurt performance—especially if you're already overtrained or underslept.
Real energy comes from good nutrition, quality sleep, and smarter stimulation, not masking fatigue. There are cleaner, more effective alternatives that support energy, focus, mood, and metabolism—without sacrificing your health.
⚡
There’s a Smarter Way to Energize
It turns out our bodies already have a solution. Nearly 84% of the caffeine in our bodies is turned into something called Paraxanthine (we call it Px), caffeine's primary metabolite. It has the same energy, alertness, and focus boosting benefits that caffeine does, but it addresses each of the 5 major caffeine problems:
Metabolism: Our bodies metabolize Px up to 40% more efficiently, meaning it provides smooth, gentle energy even to slow metabolizers
Focus: Px's structure makes it less likely to spike stress hormones, cortisol, and blood pressure. It doesn't constrict blood vessels, so your brain can focus without getting closed off.
Sleep: Because Px processes 30-40% faster, and because caffeine has an additional metabolism step, Px can clear up to 60% faster, meaning for you—sleep friendly coffee, even with an afternoon cup.
Smooth energy that builds, not bottoms out. More refined energy that compounds with each cup rather than overstimulation up to an inevitable crash.
Smart energy that fuels a cycle of rest and recovery. Rather than borrowing energy, stealing sleep and masking fatigue, Px provides a boost that goes to work with you, and goes home at the end of the day.
Our bodies seem to have a great solution. The problem is that Px doesn't exist in our bodies alone. Caffeine covers up most of the benefits. That’s why we created Px Coffee, to give you the benefits of Px on its own, replacing caffeine in freshly roasted specialty coffee to keep your ritual the same, and just upgrade the way you feel while drinking it.
4.9 stars | Over 1,000,000 cups sold
Px Coffee
Px (paraxanthine) is what your body turns caffeine into. It has all of the energy and focus boost, just without the caffeine consequences.
What this means for you?
Morning energy jitter-free
Sharper focus concentrate without fog
Afternoon productivity without the crash
Better sleep without restless nights
Smarter metabolism stomach friendly
Great taste and freshly roasted
AS SEEN IN
No more caffeine rollercoaster.
There's no doubt about it: Coffee is essential to our daily routines. But traditional coffee has caffeine, and caffeine comes with downsides.
You get about 30 minutes of free energy before the jitters and brain fog kick in. Then there's the afternoon cup or the afternoon crash. Both affect the rest of your day. It's frustrating to feel dependent on caffeine just to function.
What if coffee could be smarter? No more jitters... No more crashes... Only smooth, consistent, reliable energy.
After years of research, Rarebird has created the first and only Px Coffee. Using patented technology, Rarebird replaces caffeine with Px—an ingredient that naturally occurs in your body, but is typically overshadowed by the side effects of caffeine. Rarebird is the only coffee that allows you to experience the benefits of Px on its own.
Px kickstarts your day without triggering cortisol and adrenaline spikes, so you can have sip throughout the day, staying energized and focused, avoiding midday slumps and crashes and still sleep soundly at night.
With Px, you can stop worrying about caffeine and simply replace it with something better.
Rarebird's Story
"Like millions, I relied on caffeine to get through the day—until I realized it was a crutch. Instead of giving me energy, it left me anxious and burned out. When I couldn’t find a better alternative, I was forced to make one. Px Coffee was born from a simple idea: energy should work with your body, not against it."
- Jeffrey, Founder & CEO
Px Coffee
Patented | Award-winning | Mold-free
The Only Px Coffee
Rarebird is the only Px Coffee on the planet—patented, exclusive, and designed to work with your body, not against it.
Smooth energy. No hijacked stress system. No caffeine crash. Just a better coffee experience.
US Patents 11,872,232 and 12,178,820
Benefits of Px Coffee
Spike-Free Energy
Unlike caffeine, Px Coffee won’t spike stress hormones like cortisol and adrenaline. Instead of leaving you jittery and wired, it provides smooth, focused energy that works with your body—not against it. No stress overload, just clean, balanced alertness.
Break the Burnout Cycle
Caffeine gives you a temporary boost, but over time, it wears you down — creating a cycle of dependence and exhaustion. Px Coffee helps you stay energized without overstimulating your nervous system, so you can power through your day without running on empty.
More Restful Sleep
Px metabolizes faster than caffeine, so it won’t linger in your system and disrupt your sleep. That means you can enjoy coffee during the day without sacrificing deep, restful sleep at night. Wake up feeling truly refreshed.
Is Px Coffee right for you?
Px Coffee offers benefits whether you drink decaf or regular, one cup or 5.
For Decaf Drinkers
Px provides a cleaner, better energy than caffeine. But because Px is more specialized and easier for your body to process, it won't make you jittery and overstimulated.
For "1-2 Cuppers"
Caffeine gives you a morning boost but anything more (and anything past noon) and jittery all afternoon and up all night. Px allows you to wake up energized, re-up with an afternoon cup, and still sleep soundly at night.
For "Coffee-holics"
You process caffeine ok, but there's not really a boost after the first or second cup; chances are your afternoons are unfocused and foggy and you wake up after sleeping 8 hours feeling like you only slept 6. That's because A) caffeine doesn't stack and B) still affects the quality of your sleep. Px's efficient metabolism and fewer off-target side-effects mean that unlike with caffeine, each cup should work for you, not against you, and get processed before you go to bed so that 8 hours means 8 hours.
Exceptional Taste
Great coffee should taste as good as it makes you feel.
We source high-quality beans and roast them to perfection, so you get the same rich, full-bodied coffee experience you love—with a smarter caffeine alternative.
Voted Best New Product by the Specialty Coffee Association in 2023, this is a brew you can depend on.
How to brew Px Coffee
Rarebird brews like traditional coffee. Brew it like you would your (old) favorite product. It can be drip-brewed, poured over, french-pressed, pulled (espresso), and even cold-brewed.
The serving size is 6g (or approx. 1 Tbsp), containing 60mg of Px. We recommend brewing 1-2 tablespoons per cup (6-8 oz.) of water, depending on how strong you like your coffee. For a standard 8-cup coffee maker, this is 1/2 cup of grounds.
Quality Testing & Science
Third Party Testing
We tested for mold and mycotoxins (ochratoxin and aflotoxin) to ensure quality and safety.
Certified Production
Roasted in GMP and FDA certified facilities in the U.S. and thoroughly tested for contaminants.
Rated 4.9/5.0 from 345 reviews
Dark Roast | 12 oz. Bag
Our most popular roast. Rich and bold with notes of dark chocolate, toasted marshmallow, and roasted nuts.
60mg Px per serving
Caffeine-like energy without the jitters
No afternoon crashes, sleepless nights
Roasted fresh to order every week
Most popular!
Dark Roast
Bold
$0.43
dark chocolate, marshmallow
Medium Roast
Classic
$0.40
chocolate, brown sugar, citrus
1 Bag
(56 Cups)
$0.43
/cup
Most popular!
2 Bags
(112 Cups)
$0.40
/cup
4 Bags
(224 Cups)
$0.35
/cup
1 Bag
(56 Cups)
$0.43
/cup
Most popular!
2 Bags
(112 Cups)
$0.40
/cup
4 Bags
(224 Cups)
$0.35
/cup
FREE SHIPPING on all subscriptions!
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$45.00
Subscription Benefits:
/every 4 weeks
2 bags delivered every month
25% off one-time purchase price
Free shipping on all subscriptions
Pause or cancel anytime (online)
30 days risk-free
One-time purchase
No discount
No free shipping
FREE SHIPPING on all subscriptions!
Subscribe & Save
Benefits:
off on every order
Free shipping on all subscriptions
Auto-ship every month
60-day guarantee try risk-free
Auto-ships once per month
Pause, change or cancel anytime
30 days risk-free
One-time purchase
You'll miss out on:
No discount
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Need K-Cup Pods or Espresso Grind?
In stock, ready to ship
Benefits Over Time
Day 1: First cup. Only energy, no crash.
Week 1: Better sleep, better focus.
Month 1: Peak performance every day.
The Only Px Coffee
Rarebird is the only Px Coffee on the planet—patented, exclusive, and designed to work with your body, not against it.
Smooth energy. No hijacked stress system. No caffeine crash. Just a better coffee experience.
US Patents 11,872,232 and 12,178,820
Benefits of Px Coffee
Spike-Free Energy
Unlike caffeine, Px Coffee won’t spike stress hormones like cortisol and adrenaline. Instead of leaving you jittery and wired, it provides smooth, focused energy that works with your body—not against it. No stress overload, just clean, balanced alertness.
Break the Burnout Cycle
Caffeine gives you a temporary boost, but over time, it wears you down — creating a cycle of dependence and exhaustion. Px Coffee helps you stay energized without overstimulating your nervous system, so you can power through your day without running on empty.
More Restful Sleep
Px metabolizes faster than caffeine, so it won’t linger in your system and disrupt your sleep. That means you can enjoy coffee during the day without sacrificing deep, restful sleep at night. Wake up feeling truly refreshed.
Is Px Coffee right for you?
Px Coffee offers benefits whether you drink decaf or regular, one cup or 5.
For Decaf Drinkers
Px provides a cleaner, better energy than caffeine. But because Px is more specialized and easier for your body to process, it won't make you jittery and overstimulated.
For "1-2 Cuppers"
Caffeine gives you a morning boost but anything more (and anything past noon) and jittery all afternoon and up all night. Px allows you to wake up energized, re-up with an afternoon cup, and still sleep soundly at night.
For "Coffee-holics"
You process caffeine ok, but there's not really a boost after the first or second cup; chances are your afternoons are unfocused and foggy and you wake up after sleeping 8 hours feeling like you only slept 6. That's because A) caffeine doesn't stack and B) still affects the quality of your sleep. Px's efficient metabolism and fewer off-target side-effects mean that unlike with caffeine, each cup should work for you, not against you, and get processed before you go to bed so that 8 hours means 8 hours.
Exceptional Taste
Great coffee should taste as good as it makes you feel.
We source high-quality beans and roast them to perfection, so you get the same rich, full-bodied coffee experience you love—with a smarter caffeine alternative.
Voted Best New Product by the Specialty Coffee Association in 2023, this is a brew you can depend on.
How to brew Px Coffee
Rarebird brews like traditional coffee. Brew it like you would your (old) favorite product. It can be drip-brewed, poured over, french-pressed, pulled (espresso), and even cold-brewed.
The serving size is 6g (or approx. 1 Tbsp), containing 60mg of Px. We recommend brewing 1-2 tablespoons per cup (6-8 oz.) of water, depending on how strong you like your coffee. For a standard 8-cup coffee maker, this is 1/2 cup of grounds.
Quality Testing & Science
Third Party Testing
We tested for mold and mycotoxins (ochratoxin and aflotoxin) to ensure quality and safety.
Certified Production
Roasted in GMP and FDA certified facilities in the U.S. and thoroughly tested for contaminants.
Other popular products
K-Cup Pods
Cold Brew Cans
Instant Sachets
How Does it Compare?
Our patented formula sets a new standard that traditional coffee can't match.
Rich coffee flavor
Smooth, jitter-free energy
Sleep friendly
Reduces stress
Stomach friendly
Focused, not wired
Freshly roasted weekly
Px Coffee
Other coffees
Coffee alternatives
Ships Every 3 Months
chocolate
Sudisfaction Guaranteed
mandarin
Free Shipping Over $50
brown sugar
brew at home or take your Rarebird on the go.
make it your way:
fresh-roasted ground coffee, k-cup pods, award-winning instant, and ready-to-drink cold brew cans
4.9 stars | 750,000+ cups sold
Join thousands
Who have made the switch
Better health through coffee
Afternoons
Sleep
Px's more efficient metabolism means energized afternoons, relaxed evenings, and better sleep, even when enjoyed later in the day.
Hormones
Control
No cortisol or blood pressure spikes means you can sip throughout the day and stay focused and in control—because you want to, not have to.
Anxiety
Stress
Multiple studies have shown Px to be anxiolytic (reducing anxiety), while a 2024 study found caffeine to be likely to actually increase anxiety.
Quality
Mold-Free
We strictly procure sustainably harvested specialty grade, single-origin coffee and test for mold and mycotoxins.
Px Cold Brew
Smooth | Chocolatey | Ready-to-drink
Do I need to refrigerate Px Cold Brew?
While we recommend chilling before enjoying, Px Cold Brew is shelf stable and can go with you to work, the beach, and anywhere in between.
Benefits of Px Coffee
Spike-Free Energy
Unlike caffeine, Px Coffee won’t spike stress hormones like cortisol and adrenaline. Instead of leaving you jittery and wired, it provides smooth, focused energy that works with your body—not against it. No stress overload, just clean, balanced alertness.
Break the Burnout Cycle
Caffeine gives you a temporary boost, but over time, it wears you down — creating a cycle of dependence and exhaustion. Px Coffee helps you stay energized without overstimulating your nervous system, so you can power through your day without running on empty.
More Restful Sleep
Px metabolizes faster than caffeine, so it won’t linger in your system and disrupt your sleep. That means you can enjoy coffee during the day without sacrificing deep, restful sleep at night. Wake up feeling truly refreshed.
Who can benefit from Px Coffee?
Px Coffee offers benefits whether you drink decaf or regular, one cup or 5.
For Decaf Drinkers
Px provides a cleaner, better energy than caffeine. But because Px is more specialized and easier for your body to process, it won't make you jittery and overstimulated.
For "1-2 Cuppers"
Caffeine gives you a morning boost but anything more (and anything past noon) and jittery all afternoon and up all night. Px allows you to wake up energized, re-up with an afternoon cup, and still sleep soundly at night.
For "Coffee-holics"
You process caffeine ok, but there's not really a boost after the first or second cup; chances are your afternoons are unfocused and foggy and you wake up after sleeping 8 hours feeling like you only slept 6. That's because A) caffeine doesn't stack and B) still affects the quality of your sleep. Px's efficient metabolism and fewer off-target side-effects mean that unlike with caffeine, each cup should work for you, not against you, and get processed before you go to bed so that 8 hours means 8 hours.
Black | 12-Pack, 12 oz. Cans
Ready to drink and canned for your convenience, this addition to our Px Coffee line serves as an excellent way to enjoy our signature coffee in your home or on the go. It offers the jitter-free energy boost, improved focus and better sleep you've come to love from Px Coffee.
0g Sugar
15 Calories
60mg Px per serving
Caffeine-like energy without the jitters
No afternoon crashes, sleepless nights
No refrigeration required
FREE SHIPPING on all subscriptions!
Subscribe & Save
Benefits:
off on every order
Free shipping on all subscriptions
Auto-ship every month
60-day guarantee try risk-free
Auto-ships once per month
Pause, change or cancel anytime
30 days risk-free
One-time purchase
You'll miss out on:
No discount
No free shipping
Do I need to refrigerate Cold Brew?
While we recommend chilling before enjoying, Px Cold Brew is shelf stable and can go with you to work, the beach, and anywhere in between.
Benefits of Px Coffee
Spike-Free Energy
Unlike caffeine, Px Coffee won’t spike stress hormones like cortisol and adrenaline. Instead of leaving you jittery and wired, it provides smooth, focused energy that works with your body—not against it. No stress overload, just clean, balanced alertness.
Break the Burnout Cycle
Caffeine gives you a temporary boost, but over time, it wears you down — creating a cycle of dependence and exhaustion. Px Coffee helps you stay energized without overstimulating your nervous system, so you can power through your day without running on empty.
More Restful Sleep
Px metabolizes faster than caffeine, so it won’t linger in your system and disrupt your sleep. That means you can enjoy coffee during the day without sacrificing deep, restful sleep at night. Wake up feeling truly refreshed.
Who can benefit from Px Coffee?
Px Coffee offers benefits whether you drink decaf or regular, one cup or 5.
For Decaf Drinkers
Px provides a cleaner, better energy than caffeine. But because Px is more specialized and easier for your body to process, it won't make you jittery and overstimulated.
For "1-2 Cuppers"
Caffeine gives you a morning boost but anything more (and anything past noon) and jittery all afternoon and up all night. Px allows you to wake up energized, re-up with an afternoon cup, and still sleep soundly at night.
For "Coffee-holics"
You process caffeine ok, but there's not really a boost after the first or second cup; chances are your afternoons are unfocused and foggy and you wake up after sleeping 8 hours feeling like you only slept 6. That's because A) caffeine doesn't stack and B) still affects the quality of your sleep. Px's efficient metabolism and fewer off-target side-effects mean that unlike with caffeine, each cup should work for you, not against you, and get processed before you go to bed so that 8 hours means 8 hours.
WIRED not... Wired
"Honestly, I felt many of the positive effects after my first cup. I felt focused and got a lot of work done, certainly more than I would have if I didn’t have any coffee at all, and I got absolutely none of the heart-racing, jittery feeling I do with regular coffee. Even if you drink a lot of this, you’re not going to feel cracked out, but your attention span will likely increase. It’s a weird biohack, but it works. Another bonus—I didn’t feel it rush through my digestive system as I do with regular coffee, if you know what I mean."
— Andrew Watman, Wired
Watch Ali's Review
1 week with Px Coffee
Energy Boost
•
Sleep Quality
•
Focus
•
Cortisol
FAQs
Don't see your answer? Reach out to contact@rarebird.coffee and our team will be happy to help!
What is Px?
Px looks like caffeine, but functions a lot differently, working smarter for you, instead of against you.
Here’s the science: Px is the primary metabolite of caffeine—your body converts about 80% of the caffeine you consume into Px. It doesn’t occur in plants like caffeine does, but it exists naturally in the human body.
The problem? Until now, you could only experience the benefits of Px while dealing with the side-effects of caffeine at the same time.
At Rarebird, we've developed unique technology to produce the first and only coffee that contains Px instead of caffeine, so that you can get all of the energy, focus, and endurance benefits without caffeine's side effects.
What does Px Coffee taste like?
Px Coffee looks, smells, brews, and tastes just like traditional coffee. The only difference is that it contains Px instead of caffeine.
We start with a specialty-grade Colombian arabica coffee, which is decaffeinated at the source using the Sugarcane process. This method is safe, environmentally friendly, and preserves the coffee flavor you love. The coffee is then shipped to the US, where it is tested for mycotoxins upon arrival.
We work with sustainably focused coffee importers to ensure the highest quality standards, ultimately providing you a cup that tastes as good as it makes you feel.
Is this still real coffee?
Yes. We use single-origin Colombian Arabica beans, roasted weekly in small batches. It’s decaffeinated using the clean sugarcane method and brewed exactly like regular coffee.
Px Coffee can be drip-brewed, poured over, french-pressed, pulled (espresso), and even cold-brewed.
Ground Px Coffee
We recommend brewing at a 18:1 water:grounds ratio. Every 6g (or approx. 1 Tbsp) contains 60mg of Px.
Px Coffee Pods
Typical K-Cup pods tend to be around 9-12 grams. Our Px Pods contains are "super-filled" containing 14g, meaning one box of 24 pods is the equivalent of one 12-oz. bag of Px Ground coffee. Each pod also contains 60mg of Px.
Who can benefit from Px Coffee?
Anyone who wants clean energy without the downsides of caffeine. Great for caffeine-sensitive individuals, productivity chasers, wellness-lovers, and daily drinkers.
Many customers notice a difference after just a few cups. We recommend switching to Px Coffee for at least a full week to fully experience its benefits to energy, focus, and sleep.
Is Px safe?
Px is GRAS-affirmed, with a better safety and metabolic profile than caffeine. It has a shorter half-life and does not disrupt sleep or spike cortisol levels.