Kanna Side Effects: An Honest, Evidence-Based Guide

Kanna is generally well tolerated at normal servings, and most reported side effects are mild, temporary, and dose-related. The most commonly reported side effects include headache, nausea, mildly upset stomach, and changes in appetite.

Doing a little research before you try kanna for the first time? Good move. It’s always wise to do a little digging before you start a new supplement. So, let’s start with the basics:

Is Kanna Safe?

This is the big one, right? After all, why in the world would you take a supplement that’s bad for your health? The good news is that kanna plant (Sceletium tortuosum) supplements are generally considered safe to take when used responsibly. 

Several human studies evaluating standardized kanna extracts have reported favorable safety and tolerability profiles, with most adverse effects being mild and self-limiting. Researchers have also noted relatively low rates of serious side effects in controlled settings.

That said, “generally safe” doesn't mean it’s appropriate for everyone. Individual responses can vary, and factors such as serving size, concurrent medications, overall health status, and product quality can all influence the experience.

If you have a medical condition or take prescription medications, it's always wise to speak with a healthcare professional before trying this (or any other) supplement.

Kanna Side Effects at a Glance

While kanna is generally considered safe, there can be side effects for some users. In this guide, we’ll dig into the most commonly reported kanna side effects, who should avoid kanna, and practical ways to reduce the likelihood of an unpleasant experience. Here’s a handy chart to get us started:

It’s worth noting that many of these effects are not unique to kanna. Similar reactions can occur with a wide variety of botanical supplements.

Common, Mild Side Effects

Most reported kanna side effects fall into the category of mild, temporary discomfort:

Headache

Some users report mild headaches, particularly when trying kanna for the first time or using larger servings. This may be related to individual sensitivity, hydration status, or serving size. In many cases, headaches improve by reducing the amount used or ensuring adequate hydration. Being sensitive to headaches myself, I always drink a glass of water when I use kanna.

Nausea

Kanna nausea is one of the more commonly searched side effects. For many people, nausea appears to be dose-dependent, meaning the user has taken more than their body can comfortably tolerate. Taking kanna with food may help reduce this issue.

Mild Stomach Discomfort

Digestive discomfort can occasionally occur, particularly when kanna is taken on an empty stomach. Fortunately, this effect is usually temporary and resolves without intervention. You can also minimize your chance for tummy troubles by taking your kanna with food.

Appetite Changes

Some individuals report temporary changes in appetite after taking kanna. These generally pass when your dose peters out.

Less Common Side Effects

Although less frequently reported, there are a few additional kanna effects worth mentioning.

Feeling Overstimulated

Kanna products can be energizing (it’s one of the main kanna benefits!). That said, for individuals who are sensitive to stimulation, this may feel uncomfortable rather than enjoyable.

Temporary Fatigue

On the opposite end of the spectrum, some users report feeling more relaxed or tired than expected.

Mood Changes

One of kanna’s main benefits is that it’s a mood booster for most people. Some people are sensitive to those effects and may not tolerate that experience as well as others.

Side Effects by Dose and Format

One of the clearest patterns we see with kanna side effects is that they often become more likely as serving size increases. In other words: Over-serving is usually the culprit.

Many first-time users assume that if a small amount feels good, more must be better. That isn't always true. Most reports of nausea, headaches, overstimulation, or general discomfort occur after taking more than an individual's optimal serving.

Format can also play a role. Edibles, like kanna gummies and kanna tablets, can take a little longer to kick in since they have to pass through the digestive tract before being absorbed into the bloodstream. They’re also consistently dosed, so you always have a clear idea of how much you’re taking. Powders and extracts, on the other hand, rely on your own measuring skills, which makes it easier to accidentally use more than you intended.

For more information, see our Kanna Dosage Guide and Kanna Tablets vs Gummies vs Powder Comparison.

How to Reduce the Chance of Side Effects

If you're trying kanna for the first time, here are a few tips to help improve your experience.

Start Low

The most effective way to avoid unwanted side effects is to try a low dose (half a serving) your first time to see how it affects you. Then, next time you try it, you can adjust your dosage accordingly.

Take It With Food

Many users find that taking kanna with food reduces the likelihood of nausea or stomach discomfort.

Stay Hydrated

Hydration supports overall well-being and may help reduce headaches and general discomfort.

Pay Attention to Timing

Since kanna products generally promote energy, focus, sociability, and mood, many people prefer to use them early in the day. Or, if they do use them in the evening, it’s before going out. If you’re trying to wind down for bed, you should probably steer clear of kanna products.

See What Other Ingredients Are in Your Product

If your kanna product contains other active ingredients, they will likely have an impact on your experience. For instance, our gummies and tablets contain a variety of supplement ingredients that promote energy, focus, and mood. You should also note that our tablets are dosed considerably higher than our gummies, so their effects will be much more pronounced.

Is Kanna Addictive?

Current research does not indicate that kanna has the same dependence profile associated with addictive substances such as nicotine, opioids, or alcohol. As with any supplement, though, responsible use is important. If you find yourself relying heavily on any substance or supplement to feel normal, it’s worth discussing with a healthcare professional.

Who Should Avoid Kanna?

While most healthy adults tolerate kanna well, certain groups should avoid it unless specifically advised otherwise by a healthcare provider.

Pregnant or Nursing Individuals

There is currently insufficient safety data regarding kanna use during pregnancy or breastfeeding. For that reason, avoidance is generally recommended.

Individuals Taking SSRIs or Other Serotonergic Medications

Kanna may interact with medications that affect serotonin levels, including SSRIs, SNRIs, MAOIs, and other serotonergic medications. Anyone taking these medications should consult their healthcare provider before using kanna.

When to Stop and See a Doctor

Most kanna side effects are mild and temporary. However, you should discontinue use and seek medical attention if you experience:

• Severe or persistent vomiting

• Significant dizziness

• Difficulty breathing

• Chest pain

• Rapid heartbeat that feels concerning

• Signs of an allergic reaction

• Any unexpected or severe symptoms

When in doubt, contacting a healthcare professional is always the safest choice.

Final Thoughts

Kanna extract can have side effects for some users, but for most healthy adults, those common side effects are generally mild, temporary, and closely linked to serving size. The best way to avoid unwanted side effects is to stick to the recommended serving size (or less, for first-time users). You can also minimize stomach and headache issues by taking your kanna with food and hydrating. 

We hope this guide was helpful and wish you all the best on your kanna journey.