Black licorice is a classic candy with a bold, unmistakable taste—but eating too much of it can pose health risks, especially for those with heart or kidney conditions. Experts have found that consuming more than 2 ounces daily over a couple of weeks can trigger heart rhythm issues, particularly in people over the age of 40.

While it’s safe in moderation for most, it’s important to understand the potential dangers and how to enjoy black licorice responsibly. You’ll often see this treat during holidays like Halloween or sold as nostalgic candy favorites at the movies.

Why Black Licorice Can Be Risky

Though the FDA considers black licorice safe for general consumption, the key compound in it—glycyrrhizin, which comes from licorice root—can cause trouble when consumed in excess. Glycyrrhizin affects your body’s potassium balance, potentially leading to temporary drops in potassium levels.

Low potassium can result in symptoms like:

  • Irregular heartbeat

  • High blood pressure

  • Swelling in the limbs

  • Tiredness and fatigue

  • In severe cases, heart failure

These issues typically resolve once licorice intake is stopped. However, several serious cases have been documented in hospitals, where patients experienced muscle paralysis and weakness due to overconsumption. Recovery generally requires medical treatment, such as electrolyte replacement and diuretics.

How Much Licorice Is Too Much?

There’s no one-size-fits-all answer, but tolerance to black licorice varies widely between individuals. Government guidelines suggest keeping daily consumption below 2 ounces (about 56 grams). If you’re older or have underlying health conditions, you may need to be even more cautious.

Can Black Licorice Offer Health Benefits?

Beyond its reputation as candy, licorice root has been used for centuries in Chinese, Indian (Ayurvedic), and herbal medicine. Research shows it contains bioactive compounds with potential health effects, such as:

  • Reducing inflammation

  • Fighting oxidative stress

  • Supporting liver health

  • Boosting the immune system

  • Combating viruses

  • Providing mild antidepressant effects

  • Possibly offering cancer-fighting properties

Some studies also indicate that black licorice might help control blood sugar and cholesterol in people with metabolic issues. However, since it can raise blood pressure, it may do more harm than good for certain individuals.

What’s in Black Licorice?

Though it’s considered candy, black licorice contains trace amounts of several nutrients. These include:

  • Essential minerals like calcium, magnesium, and potassium

  • Iron and zinc for immune support

  • Selenium and manganese with antioxidant properties

  • Small quantities of amino acids

Keep in mind that most commercial licorice candy is not a significant source of nutrition and may also contain sugar, artificial coloring, and preservatives.

Tips for Safe Consumption

If you enjoy black licorice, moderation is key. Always check the label to understand serving sizes and avoid eating large portions in one sitting. If you experience unusual symptoms—especially heart palpitations or muscle weakness—seek medical help immediately.

Talk to a doctor before eating black licorice if you:

  • Are pregnant

  • Have high blood pressure, heart, or kidney problems

  • Take medications such as diuretics, aspirin, hormonal birth control, or herbal remedies

Additionally, note that some products labeled “black licorice” are made with anise oil, which has a similar flavor but doesn’t contain glycyrrhizin. This can be a safer alternative for people sensitive to the effects of licorice root.

Final Thoughts

Black licorice is a divisive treat—loved by some, disliked by others. For most people, it’s fine to enjoy occasionally. However, if you have specific health conditions or take medications that may interact with glycyrrhizin, even moderate amounts could be problematic. Always listen to your body, and when in doubt, consult your healthcare provider.