It's not just the energy. It's the quality of the energy.
Joined by 100,000+ people who switched from coffee.
★★★★★
Marcus L. ✓ Verified Customer
The cleanest energy I've had
I'm a CrossFit coach and need my mornings to be SHARP. Coffee made me jittery and crashy. Zest is the cleanest energy I've ever had. Three months in and I'm never going back.
★★★★★
Priya R. ✓ Verified Customer
A game changer for my IBS
I have IBS and coffee was destroying me. My GI doctor told me to try tea. I found Zest because they have actual caffeine. Game changer.
★★★★★
Jordan K. ✓ Verified Customer
Focus that lasts all morning
I'm a graphic designer and the focus on Zest is unreal. I can sit and work for 3 hours straight without the 11 AM dip I used to get on coffee.
★★★★★
Allison M. ✓ Verified Customer
Finally, energy I could drink
Pregnant and couldn't drink coffee. Zest let me have a real cup of something energizing without my OB telling me to cut back. Lifesaver.
★★★★★
Ryan K. ✓ Verified Customer
Replaced my two-a-day energy drinks
I was knocking back 2 energy drinks a day and my heart was telling me to stop. Zest replaced both, and it tastes like actual food, not battery acid.
★★★★★
AJ Harrison ✓ Verified Customer
Saved my stomach lining
Gets me everything I need from coffee but WAY less acidic and no sugary additives. This product saved my stomach lining!
★★★★★
Cassandra W. ✓ Verified Customer
Steady all day, zero jitters
Steady energy all day with no jitters and no crash. My husband and I are now totally addicted!
★★★★★
Eli S. ✓ Verified Customer
Finally, a tea strong enough
I've tried every 'high-caffeine' tea on Amazon. Most are 60mg pretending to be 100. Zest actually delivers what it says. You feel it.
Why people switch from coffee
Coffee-level caffeine.
135–150mg of natural caffeine per cup, about 3× normal tea and comparable to a strong cup of coffee.
Zero jitters.
Every cup is paired with L-Theanine, an amino acid that takes the sharp edge off caffeine, so the energy is smooth and focused.[1]
Easy on your stomach.
Tea is roughly half as acidic as coffee. No reflux, no IBS flare, no morning rush to the bathroom.[3]
6–8 hours of clean focus.
Caffeine and L-Theanine release energy gradually. One cup carries a full work block, no afternoon crash, no 4 PM refill.
How We Stack Up
Caffeine levels per cup:
Reg. Green Tea
35mg
Reg. Black Tea
50mg
Coffee
120mg
Zest Green Tea
135mg
Zest Black Tea
150mg
Feel the synergy
Coffee-level energy. Better performance. Fraction of the cost. Natural ingredients. This is the smarter choice.
Coffee/Energy drinks
What's Inside Your Energy Tea?
Feel the difference a tea supported by science-backed ingredients can make. Scroll on the ingredients below to learn more about the benefits behind each one.
Natural Caffeine
135-150mg of Sustained Energy
Natural caffeine from premium black and green tea leaves delivers coffee-equivalent energy with smoother delivery and longer duration. Unlike synthetic caffeine powder, tea-based caffeine releases gradually for sustained alertness without harsh spikes or crashes.
Benefits:
Sustained Energy
Enhanced Focus
8-12 Hour Duration
Did you know?
Tea-based caffeine is metabolized more gradually than coffee's concentrated form, providing smoother energy delivery. When combined with L-Theanine, it produces optimal cognitive performance without negative side effects.
L-Theanine
For calm focus
L-Theanine is an amino acid naturally found in tea that promotes relaxed alertness without sedation. Clinical research proves it counteracts caffeine's jittery effects while enhancing cognitive performance, attention, and accuracy.
Benefits:
Eliminates Jitters
Enhanced Focus
Reduces Anxiety
Did you know?
Multiple peer-reviewed studies show that caffeine + L-Theanine together improves cognitive performance better than caffeine alone.
Our foundation is premium black and green tea leaves from organic farms in India, Sri Lanka, and China. Orthodox processing preserves maximum flavor and beneficial compounds including EGCG (epigallocatechin gallate) and theaflavins.
Benefits:
Powerful Antioxidants
Supports Cardiovascular Health
Cellular Protection
Did you know?
Tea is the second most consumed beverage globally (after water) and has been used for thousands of years for both enjoyment and health benefits. Studies show regular tea consumption supports long-term cognitive health and metabolic function.
Natural Flavors & Botanicals
Real fruit extracts, zero artificial ingredients
Every flavor comes from real sources: blueberries, pears, pomegranate, mint, cinnamon, and apple. We use steam distillation and cold-press extraction to capture authentic flavor, never artificial flavoring compounds or synthetic sweeteners.
Benefits:
Genuine Taste
No Artificial Ingredients
0 Calories, 0 Sugar
Did you know?
"Natural flavors" legally means the flavor is derived from real plant or animal sources (we use only plant sources). This is completely different from "artificial flavors" which are created from synthetic chemicals in labs.
Microplastic Free
Plant Fiber Teabag
GMO free
Vegan
Zero Calories
Keto Diet
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ENERGY · NO CRASH · NO JITTERS
★★★★★4.9 · 10,500+ reviews
Kicks like coffee without the crash
✓Coffee-level caffeine, 135–150mg per cup
✓Zero jitters, no afternoon crash
✓Gentle on your stomach, low acid, no reflux
✓6–8 hours of clean, focused energy
Your bundle includes
4 High Caffeine Tea Flavors
Blue Lady Black Tea
Cinnamon Apple Black Tea
Superberry Samba Green Tea
Pomegranate Mojito Green Tea
Free Bonus Items (Subscription Only)
Free Sleep TeaChamomile Lavender
Free 14oz Insulated MugKeeps tea hot 4+ hrs
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The math on your first order
$179 of tea and gifts for $58.98
Your first Subscribe & Save order stacks the 4-pack bundle with three free gifts. Here's everything that lands on your doorstep, and what it's actually worth.
If you read the label before your first sip, Zest is made for you. Built with transparent, functional ingredients and no unnecessary additives.
Energy that lasts
Natural tea-derived caffeine and L-Theanine support sustained energy and mental clarity throughout your demanding days.
Coffee-level caffeine, tea-level calm
Each serving delivers 135-150 mg of natural caffeine alongside L-Theanine to help promote focused energy with a smoother feel and fewer jitters than caffeine alone.
Gentle on your digestive system
Unlike coffee's harsh acids, Zest Tea is easy on your stomach. No reflux, no discomfort, just reliable performance.
Thoughtfully selected ingredients
If you read the label before your first sip, Zest is made for you. Built with transparent, functional ingredients and no unnecessary additives.
Energy that lasts
Natural tea-derived caffeine and L-Theanine support sustained energy and mental clarity throughout your demanding days.
Coffee-level caffeine, tea-level calm
Each serving delivers 135-150 mg of natural caffeine alongside L-Theanine to help promote focused energy with a smoother feel and fewer jitters than caffeine alone.
Gentle on your digestive system
Unlike coffee's harsh acids, Zest Tea is easy on your stomach. No reflux, no discomfort, just reliable performance.
Based on customer-reported experiences and clinical studies on caffeine + L-Theanine. Individual results may vary. Zest is not intended to diagnose, treat, cure, or prevent any disease.
97%
Would recommend Zest to their friends.
94%
Say Zest boosts their energy
81%
Say Zest helps them stay focused without the jitters or crash.
98%
Say they enjoy the flavor
US VS THEM
Not all energy sources work the same. Zest is built for smooth, focused days.
HOW DO YOUR HIGH CAFFEINE TEAS REDUCE THE JITTERS AND CRASH?
Our high caffeine teas are packed with amino acids, including L-Theanine, which studies show helps moderate caffeine’s effects.
HOW MUCH CAFFEINE IS IN ZEST HIGH CAFFEINE TEAS?
Our high caffeine teas range between 135 and 150mg of natural caffeine per serving, depending on the flavor.
IS IT REALLY THE MOST CAFFEINATED TEA ON THE MARKET?
As far as we know, yes. And by quite a margin. Zest high caffeine teas have about 3x the caffeine of normal tea, or about as much caffeine as a regular cup of joe.
CAN THE LEVEL OF CAFFEINE IN ZEST HIGH CAFFEINE TEAS BE HARMFUL?
Up to 400mg of caffeine per day is generally considered safe. With 120-150mg per serving, Zest’s high caffeine teas are comparable to a strong cup of coffee.
HOW DO YOU INCREASE THE CAFFEINE LEVELS?
We have developed an innovative proprietary blending method that enhances the caffeine levels. The extra caffeine comes from natural tea extracts. The process and ingredients used are natural.
THE TEA IS WHITE, IS THAT MOLD?
Tea in its natural form isn’t as caffeinated as we’d like it to be, so we developed a way to add more caffeine to our blends using natural tea extracts. A common side effect during this process is the whitening of the tea.
DO ZEST TEA BAGS CONTAIN ANY PLASTICS/MICRO-PLASTICS?
Despite the look, our tea bags are made of a plant-fiber material that is compostable and does not contain plastics/micro-plastics.
ARE YOUR PRODUCTS SUGAR FREE?
Our hot teas are all sugar free. Our ready-to-drink energy iced teas have 0 sugar flavors (and other, low-sugar flavors). Our powder packs contain a little sugar.
ARE YOUR PRODUCTS GLUTEN FREE?
All Zest products are gluten free.
HOW MANY CALORIES/CARBS ARE IN ZEST PRODUCTS? CAN I DRINK THIS ON A KETO DIET?
Our hot teas have 0 calories and carbs.
HOW MUCH WATER TO USE PER TEA BAG?
One serving is typically brewed with 6-8 oz of water. Some use as much as 12-15oz of water for the same amount of tea so it’s completely up to your personal preferences. We recommend starting with the standard measurements and experimenting to see what you like best.
FOR HOW LONG SHOULD I BREW THE TEA?
Use near-boiling water (freshly boiled water) and brew the tea for 3-4 min if brewing Green Tea, or 4-5 min if brewing Black Tea.
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.
Free Sleep TeaChamomile Lavender
Free 14oz Insulated MugKeeps tea hot 4+ hrs
Zest Energy Tea
