What Are The Negatives of Kombucha?

what are the negatives of kombucha

It’s pretty obvious that there are a lot of kombucha benefits that people tout, but there are also some negatives to this drink.

In this blog post, we will discuss the downsides of drinking kombucha.

Keep in mind that everyone’s body is different and you may not experience these same side effects. If you do experience any negative effects from drinking kombucha, be sure to stop consuming it and consult with a health professional.

It May Have More Sugar Than You Think

Sugar is necessary for the fermentation process and gives kombucha its fizzy quality. During the first fermentation, most of the sugar is eaten by the SCOBY.

The amount of sugar that is left during the first fermentation depends on how long you let the fermentation continue. If you taste it and it is sweet, there is probably a good amount of sugar left in it. If it is more sour and acidic, then it likely won’t have much sugar left at all.

However, during the second fermentation, you usually flavor the kombucha with fruit or other ingredients that contain sugar. This helps with the carbonation, but most of that sugar will remain in the final product that you drink.

For people who are trying to cut back on their sugar intake, it’s best to just brew your own kombucha and let it ferment as long as possible for most of the sugar to be eaten.

It May Not Be Suitable for Everyone

While kombucha is generally safe for most people to drink, there are some exceptions. If you have a weakened immune system, you should avoid drinking kombucha as it may contain bacteria that could make you sick.

Pregnant women and young children should also avoid drinking kombucha due to the risk of contracting a foodborne illness.

It May Cause an Upset Stomach

For some people, drinking kombucha can cause stomach upset, including bloating, gas, and nausea. If you experience any of these symptoms after drinking kombucha, it’s best to stop consuming it.

As with anything new that you introduce to your body, it’s important to listen to how your body reacts. If you experience any negative side effects from drinking kombucha, be sure to stop consuming it and consult with a health professional.

It Could Lead To Contamination

Because kombucha is the result of natural fermentation, improper storage or poor environmental control may lead to contamination. Kombucha contaminated with bacteria or yeasts from another source may not be as healthy or even poisonous to consume.

Contamination from a container might also be a concern. Contaminants like as lead or other toxins may seep into porous pots, resins, or glazes. Some plastics can break down into the kombucha during fermentation. Depending on the chemical, contaminants in the container might put the individual at risk for adverse effects or toxicity.

While rare when making your own kombucha, it is especially important to make sure you are using the proper equipment and environment to avoid any possibilities of contamination.

It Could Lead to Excess Caffeine Consumption

While kombucha does contain caffeine, the amount is usually very small. However, if you drink a lot of kombucha or brew it yourself, you could end up consuming more caffeine than you realize.

This is especially true if you add coffee or tea to your kombucha during the brewing process. Too much caffeine can lead to side effects like anxiety, insomnia, and heart palpitations.

It’s important to be aware of how much caffeine you’re consuming if you drink kombucha on a regular basis. If you start to experience any negative side effects from caffeine, it’s best to cut back or stop drinking kombucha altogether.

It Can Be Bad For Your Teeth

Kombucha is acidic, which means it can erode your tooth enamel if you drink it on a regular basis. If you are going to drink kombucha, be sure to do so through a straw and rinse your mouth with water afterward.


Kombucha may have some potential negatives, but the positives seem to outweigh the negatives for most people. If you’re thinking of trying kombucha, we recommend that you start with a small amount and see how your body reacts. Cheers!

About The Author

Picture of Stephen aka “Kombucha Coach”

Stephen aka “Kombucha Coach”

My goal with Kombucha Coach is to help teach people about kombucha and start their journey into home brewing it themselves.