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up to 46% off + FREE GIFT
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Patented | Award-winning
Px Coffee is the only coffee that replaces caffeine with paraxanthine—your body's natural, primary caffeine metabolite. Sharper focus, smoother energy, and better sleep, all in a great cup of coffee.
Learn: What is Px Coffee?
Rarebird is the only Px Coffee on the planet—patented, exclusive, and designed by PhD's to work with your body, not against it.
Our Px Coffee is just 2 ingredients: fresh roasted specialty decaf coffee + paraxanthine.
You might be asking (most people do) "what's paraxanthine?" Glad you asked 😊 Read on to find out.
Learn More: Why Px Coffee?
Px Coffee replaces caffeine with paraxanthine.
Why do we replace caffeine? Caffeine may give you a temporary boost in the morning, but it wreaks havoc on your body and mind throughout the day (and night)—that's actually why it exists in nature [read more]—and your body takes 10-12 hours to fully convert it into "something else."
Paraxanthine (Px) is that something else. Your body turns ~84% of the caffeine you consume directly into Px. It has all the energy and focus-boost just without the downsides of caffeine.
"But if our body makes it, then why make a special coffee?"
That's our favorite question. Because while caffeine is getting metabolized for 10-12 hours, its side effects (stress, brain fog, stomach issues, and more) are covering up any Px benefits.
So we created Px Coffee to skip caffeine (literally) and deliver Px directly in your favorite cup of coffee. This means you get the energy, focus and flavor you expect from coffee, without the overstimulation, mental fog, and sleep disruptions that come with caffeine.
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 more efficiently than caffeine, so it won’t linger in your system and disrupt your sleep like caffeine. That means you can enjoy coffee during the day (even late in the afternoon) 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, 1 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"
Px allows you to wake up energized, re-up with an afternoon cup, and still sleep soundly at night. Say hello to afternoon energy.
For "Coffee-holics"
Do you process caffeine ok, but there's not really a boost after the first or second cup?
Chances are that your afternoons are unfocused and foggy, and you wake up after sleeping 8 hours feeling like you only slept 6.
That's because caffeine A. 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 works for you, not against you.
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.
4.9 stars | 1,000,000+ cups brewed
Medium Roast
Our most popular roast. Smooth and balanced with notes of chocolate, brown sugar, and citrus.
Includes $27 in FREE welcome gifts
Includes $54 in FREE welcome gifts
Our most popular option!
Our average customer drinks about 3 cups per day. Get 36oz. of your favorite Px Coffee roasts delivered once per month & individually sealed in 12oz bags for maximum freshness. This way you, can drink freshly roasted coffee uninterrupted.
Need more/less? Customize your monthly box between 2-4 bags and get up to 35% off.
You get:
60mg Px per serving
Caffeine-like energy without the jitters
No afternoon crashes, sleepless nights
Fresh-roasted specialty beans
Trial Size
23.5% off
10 Days
1 person
34 cups
34 cups
$0.68
/cup
Most popular!
30 Days
1 person
102 cups
$0.56
/cup
Family Pack
Family Pack
30 Days
2 people
204 cups
(224 Cups)
$0.53
/cup
Most popular!
Medium Roast
Classic
$0.40
chocolate, brown sugar, citrus
Dark Roast
Bold
$0.43
dark chocolate, marshmallow
Trial Size
10 Days
34 cups
34 cups
$0.68
/cup
Most popular!
30 Days
102 cups
$0.56
/cup
Family Pack
Family Pack
60 Days
204 cups
(224 Cups)
$0.53
/cup
Trial Size
10 Days
1 bag
34 cups
$0.68
/cup
Most popular!
30 Days
3 bags
$0.56
/cup
Family Pack
Family Pack
60 Days
6 bags
(224 Cups)
$0.53
/cup
1 Bag
(56 Cups)
$0.43
/cup
Most popular!
2 Bags
(112 Cups)
$0.40
/cup
4 Bags
(224 Cups)
$0.35
/cup
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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!
1-Bag Trial
Benefits:
off your first bag
Free shipping on us
Rewards points on every dollar
60-day guarantee try risk-free
Auto-ships once per month
Pause, change or cancel anytime
30 days risk-free
FREE SHIPPING on all subscriptions!
Monthly Supply
Benefits:
☕
36oz. (3-12oz. bags) Px Coffee
🎁
FREE Rarebird notNeutral Mug
🎁
FREE Instant Px Coffee Sachets (2)
off every month
FREE shipping always
2x Rewards Points every order
60-day guarantee try risk-free
Auto-ships once per month
Pause, change or cancel anytime
30 days risk-free
FREE SHIPPING on all subscriptions!
Monthly (Family)
Benefits:
☕
72oz. (6-12oz. bags) Px Coffee
🎁
2 FREE Rarebird notNeutral Mugs
🎁
FREE Instant Px Coffee Sachets (4)
off every month
FREE shipping always
2x Rewards Points every order
60-day guarantee try risk-free
Auto-ships once per month
Pause, change or cancel anytime
30 days risk-free
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.
DreamEase Sleep Capsules Are Unlike Any Other Sleep Aid
Results After 30 Days
95%
of customers report falling asleep faster within the first week.
95%
of customers report falling asleep faster within the first week.
95%
of customers report falling asleep faster within the first week.
95%
of customers report falling asleep faster within the first week.
Based on a study of 60 individuals over 30 days using DreamEase Sleep Capsules.
FSA/HSA eligible with float
Learn: What is Px Coffee?
Rarebird is the only Px Coffee on the planet—patented, exclusive, and designed by PhD's to work with your body, not against it.
Our Px Coffee is just 2 ingredients: fresh roasted specialty decaf coffee + paraxanthine.
You might be asking (most people do) "what's paraxanthine?" Glad you asked 😊 Read on to find out
Learn More: Why Px Coffee?
Px Coffee replaces caffeine with paraxanthine.
Why do we replace caffeine? Well, caffeine may give you a temporary boost in the morning, but it wreaks havoc on your body and mind throughout the day (and night)—that's actually why it exists in nature [read more]—and your body takes 10-12 hours to fully convert it into "something else."
Paraxanthine (Px) is that something else. Your body turns ~84% of the caffeine you consume directly into Px. It has all the energy and focus-boost just without the downsides of caffeine.
"But if our body makes it, then why make a special coffee?"
That's our favorite question. Because while caffeine is getting metabolized for 10-12 hours, its side effects (stress, brain fog, stomach issues, and more) are covering up any Px benefits.
So we created Px Coffee to skip caffeine (literally) and deliver Px directly in your favorite cup of coffee.
This means you get the energy, focus and flavor you expect from coffee, without the overstimulation, mental fog, and sleep disruptions that come with caffeine.
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 more efficiently than caffeine, so it won’t linger in your system and disrupt your sleep like caffeine. That means you can enjoy coffee during the day (even late in the afternoon) without sacrificing deep, restful sleep at night. Wake up feeling truly refreshed.
Why do people drink Px Coffee?
Px Coffee drinkers love it for a wide variety of reasons and benefits including:
Improved productivity
Calmer energy
Better focus
Happy stomachs
Better sleep
Afternoon coffee
We keep a live review feed for your to read here!
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.
Other popular products
K-Cup Pods
single-serve cups
Cold Brew Cans
portable & ready-to-drink
Instant Sachets
craft coffee on the go
Caffeine out, Px in—here’s why.
Why our subscribers stay around: Unlocking focus, flow, and full potential.
99%
Smooth energy, no crash
97%
No negative impact to sleep
97%
Calm focus, no added stress
95%
Gut-friendly, calm stomach
Based on a Sept. '25 customer survey
The Coffee Helping 100,000+ Achieve Peak Performance
Thousands of happy, productive customers
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
Born from a Berkeley PhD’s Battle with Burnout
"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 Cold Brew
Smooth | Focused | 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.
4.9 stars | 750,000+ cups sold
Join thousands
Who have made the switch
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
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
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.
Ships Every 3 Months
chocolate
Sudisfaction Guaranteed
mandarin
Free Shipping Over $50
brown sugar
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?
First... the pronunciation 😉 Px stands for paraxanthine. It looks hard but really, it's simple:
pair-uh-zan-theen
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—that is, 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..e.
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.