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 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 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.
Microplastic Free
Plant Fiber Teabag
GMO free
Vegan
Zero Calories
Keto Diet
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
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
How L-Theanine Makes Caffeine Better
Clinical studies have shown that caffeine + L-Theanine improves attention, accuracy, and cognitive performance better than caffeine alone. The combination also helps to reduce the jitters, crash, and anxiety commonly associated with caffeine consumption.
US VS THEM
Not all energy sources work the same. Zest is built for smooth, focused days.
Energy Feel
Focus
Jitters / Anxiety
Crash
Energy Duration
Sugar
Artificial Ingredients
Stomach Friendly
Best For
Zest Energy Tea
Smooth & steady
Calm, clear focus
None (L-Theanine)
6–8 hours
0 g
Sustained Focus
Coffee
Spike → crash
Wired
Common
Afternoon crash
2–4 hours
0 g
Acidic
Quick wake-up
Energy Drinks
Spike → hard crash
Overstimulated
Very common
Severe crash
1–3 hours
Often 20–40 g
Often present
Often harsh
Short bursts
Regular Tea
Mild & short
Light
Rare
Fades quickly
1–3 hours
0 g
Gentle
Light energy
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 sourced from India, Sri Lanka or China, boosted with natural tea extract to 150mg of caffeine per serving in our black teas and 135mg in our greens. The leaf brings the antioxidants — EGCG (epigallocatechin gallate) and theaflavins — plus the L-Theanine that keeps the energy smooth instead of jittery.
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.
See Why They're Obsessed
Blue Lady tea is delicious!!
Gets me just what i need out of coffee but WAY less acidic and no sugary additives needed! This product saved my stomach lining!
AJ Harrison.
Verified Customer
Caffeine without the coffee jitters and upset stomach
Stephanie.
Verified Customer
I used to be a huge coffee drinker, but the acidity started to get my stomach upset. I tried Zest Tea hoping to enjoy a morning caffeine boost. I LOVE it.
Philtra.
Verified Customer
We are now totally addicted!
Coffee makes my stomach hurt and I get jittery from it. Zest smells great and tastes great while delivering steady energy all day with no jitters and no crash
Cassandra.
Verified Customer
I have more energy in the full 24-hour-day…. Absolutely no jitters OR heart palpitations
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?
This is for brewed tea. One serving of tea 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. Our powder sticks are different — Zest Elite and our Energy + Hydration packs mix into 16 to 32 oz of cold water per stick, not 6-8 oz.
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.
5 stars: 232 (87%)
4 stars: 22 (8%)
3 stars: 5 (2%)
2 stars: 5 (2%)
1 star: 2 (1%)
Some of the reviews shown are from related products the merchant grouped with this one.
B
B LeBlanc
MY GO-TO MORNING BEVERAGE. LOVE THE FLAVORS OF THE EARL GREY, LOVE THE STORAGE TIN, AND LOVE THE GOODIES I RECEIVE WITH EVERY ORDER! THANK YOU ZEST!
Hi Bonnie! We're thrilled to hear that our Earl Grey Tea Bags are your go-to morning start. Thanks so much for your wonderful feedback and for being a valued customer.
A
Anonymous
My daily favorite ❤️. Great flavors, I actually feel calmer after drinking it.
Hi there! We're so happy to hear that you enjoy our Earl Grey Tea Bags and that it helps you feel calmer. Thanks for sharing your lovely feedback!
L
Leonard Draft
I only use a couple of times, but so far it tastes really great
T
Trey
Great Earl Grey flavor! Helps provide me with good energy I think 😊
R
Robert Zamora
The best tea on the market. Much better than drinking coffee, with a good taste.
Thank you for your review!
E
Ella
Delicious earl grey flavors, and I enjoy the boosted caffeine to replace coffee. Easier on my system and I still look forward to it every morning.
Hi there! Thank you for leaving a review, we are so happy to hear you are enjoying Zest!
C
Charles T
Zest Earl Gray and (Blue Lavender?) are my go to high caffeine teas. Not my favorite earl gray but quite drinkable and as promised far less caffeine crash than with coffee, and easier in my stomach.
Thank you for taking the time to leave a review! We're glad to hear that our tea is your go-to for high caffeine options
A
Anonymous
Good tea and this time the package seals tight.
Thanks for letting us know! We’re glad you’re enjoying the tea and that the packaging arrived sealed as expected. Appreciate your support!
A
Angelika Cardew
My favorite way to wake up in the morning. It tastes great and gives the energy I need to get thru my day.
Thanks for your review! We're so glad it helps you start your day off right with its delicious taste and energizing effects.
W
William Carnes
Excellent tea and a serious boost in caffeine....exactly what I wanted.
Thank you so much for your review! We're so happy to hear that it gave you the caffeine boost you were looking for.
M
MaryBeth VanTill
This is absolutely magical to drink in the morning. It is an amazing Earl Grey with a hint of something that makes it sublime.
Thank you for your wonderful feedback on our Earl Grey tea!
M
Mat6719
It has that great Earl Grey taste combined with that high caffiene boost.
N
NETNHUSKER
Great morning tea.
Shipping and delivery is slow.
We're glad to hear that you enjoy it as a morning tea! We apologize for any delays in shipping and delivery. Our team is working hard to improve our processes and get your tea to you faster. Thank you for your understanding. Cheers!
C
Claire In NE
A little while after I started a new medication to help with weight, I lost my taste for coffee! This was a huge problem because I could only stomach very sweet iced icoffee drinks and without coffee I would crash out!
The earl grey tea is really good tasting. I have milk and sugar in it and drink two cups every morning. I haven't lost my taste for it and it is a fine wake up drink. The cost is high but so is aFrappuccino (or a Keurig cup) and this is better!
Not a huge fan of the green tea flavor which I ordered when the EG was out of stock- so I am a little nervous for what happens if they have supply issues!
Hi Claire,
Thanks so much for sharing your experience—we’re thrilled to hear you’re enjoying the Earl Grey 😊 While we do our best to keep all flavors in stock, if it’s ever unavailable, many of our customers also love our Blue Lady and Cinnamon Apple teas.
K
Kimberly Swift
Yummy
J
Joseph M.
Zest is bout it…
Great taste & great bump, especially cold…low to no artificial taste…it’s an investment…
d
dean r.
some caffeine effects noted
some caffeine effects noted
B
Brian G.
Love the teas. Especially pomegranate
Love the teas. Especially pomegranate mojito and blue lady. It's my morning routine
G
Gloria C.
Mrs. Caner
drink it every day, love it
Y
Yazed M.
Zest's Unsolved Issue
the same issue with the pouch for the Earl Grey, the bergamot oil blotted it from inside out, and zip lock is either loose, or most of the time detached and brittled. Clearly Zest is pinching every penny off of the packaging! intuitively, loose leave should not be packed in those plastic bags, beside being harmful and eco-UNfriendly, it does not prevent the leaves from any crushes during the transporting process.
P
Paul R.
I like the tea. It
I like the tea. It is intensely flavored and Zest is generous with the bergamot. My only suggestion (that does not affect the quality of the tea) is that alternative packaging be considered as the oil saturates into the bag and can weaken the zip top.
A
Amber M.
I appreciate the caffeine content,
I appreciate the caffeine content, but I'm not a fan of the Earl Grey flavor and prefer the Superberry Samba.
A
Alexandria I.
This earl grey tea has
This earl grey tea has been the best alternative to coffee I have found. No jitters, no crashes and the taste is perfect.
J
JORDAN
Love it! True Earl Grey flavor and premium quality lose leaf tea. And the classic Zest pairing of caffeine and l-theanine works as amazingly as ever! Thank you guys for saving my stomach from coffee and its effects haha. One thing I'd change is the zipper on your bags, they tend to be delicate and break easily, but it's worth that trouble to have this amazing tea!!
J
J.S.
Love it! True Earl Grey flavor and premium quality lose leaf tea. And the classic Zest pairing of caffeine and l-theanine works as amazingly as ever! Thank you guys for saving my stomach from coffee and its effects haha. One thing I'd change is the zipper on your bags, they tend to be delicate and break easily, but it's worth that trouble to have this amazing tea!!
K
Karl
This is my go to earl grey- its smooth with just the right balance of bitter from the bergamot and a single pot keeps my energy levels steady all day.
K
Karl
This is my go to earl grey- its smooth with just the right balance of bitter from the bergamot and a single pot keeps my energy levels steady all day.
S
Stephen C.
Great tea 10/10, packs a
Great tea 10/10, packs a punch
P
Paola B.
Great product!
Great product!
C
Charlotte S.
I was so excited to
I was so excited to try this but it literally tastes like chemicals
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