Frequently Asked Questions

General Questions

Why don't I feel the jitters and crash with Zest?

Zest Tea is packed with amino acids, including L-Theanine, which studies show helps moderate caffeine's effects. Read more here

How much caffeine is in Zest?

120 - 150mg of caffeine, give or take. The natural caffeine level of teas varies, so the actual content can be a few milligrams over or under the stated range.

Is it really the most caffeinated tea on the market? 

As far as we know, yes. And by quite a margin. Zest has about 3x the caffeine of normal tea, or about as much caffeine as a regular cup of joe.

Can the level of caffeine be harmful?

Up to 400mg of caffeine per day is generally considered safe. With 120-150mg per serving, Zest's caffeine levels are comparable to a strong cup of coffee.

Are your teas gluten free? Sugar free?

All of Zest Tea's blends are gluten free and while there is naturally a small amount of sugar in some of the the blend ingredients like the fruit pieces, the final brewed product is sugar free.

How many calories/carbs are in Zest tea?

Our hot teas have 0 calories and carbs. Our 0-cal Sparkling Teas also have 0 calories and 0-6g carbohydrates. Our caloric Sparkling Teas have 60 calories, and 15g carbohydrates per can (5% of Daily Value) per can. Check the product pages for more info.

How do you increase the caffeine levels?

We have developed an innovative proprietary blending method that enhances the caffeine levels using a natural tea extract. The process and ingredients used are natural.

Where do your base teas come from?

Most of our base teas come from the Nilgiri region of India and the Anhui province of China.

Can I cancel my subscription at any time?

Yes, subscriptions can be canceled at any time. We'll even text you when a subscription renews, that way you can let us know if you want to cancel or modify anything.

How do I cancel my subscription?

Log in on or contact us to request the cancelation. You can also just text back when we notify you of subscription renewals via SMS.

Can I alternate flavors or items in my subscription?

Yes, you can modify products, flavors, renewal dates, or frequency. You can that by logging in on or contacting us to request the changes.

How long do refunds take?

Refunds can take 5-7 days to show up in the bank.

Why can't I order CBD tea using PayPal?

Our CBD teas cannot be combined with regular tea purchases at this time due to compliance issues with payment processors, including PayPal.

My order is still on “Label Created” status, what do I do?

If the shipping label is with USPS, wait up to 12 business days and contact us. What often happens is that the package doesn't make it into the tracking system, but gets delivered anyway. If there are no tracking updates after 12 business days and you haven't received anything, let us know. We will investigate and usually approve to resend the order.

If the shipping label is with UPS or Fedex, please contact us 3 business days after the "Label Created" date if there are no tracking updates. Our team will investigate.

What are your hours of operation?

We don't have a phone line or a live chat, but we do respond relatively quickly via email or SMS between 9AM and 5PM ET.

Where do I find nutritional information?

You can find the nutritional information for each product on their respective product pages.



Where is Zest Tea located?

Baltimore, Maryland

Is Zest hiring?

See our Careers page for up to date info. 

Does Zest Tea work with bloggers or influencers?

We love working with bloggers and influencers! If you are interested in collaborating, send an email to



Do you ship Zest Tea internationally?

Yes we do, but not for our Sparkling Teas or CBD teas at this time. Shipping charges vary by country, package weight and carrier. For accurate estimates shipping charges (and carrier options), please add the items you’re looking to buy and go to the check-out page.

Is Zest Tea available in stores?

You can see a list of stores that currently carry Zest here. Not by you yet? Never fear. We are always looking to expand. If you know of a store (or own one) that would be interested in Zest, we’re all ears!

Can I purchase Zest wholesale for my office or shop or become a distributor?

If you are interested in wholesale and/or distribution of Zest please fill out our wholesale request page