How Quickly Does Licorice Raise Blood Pressure?

Licorice can raise blood pressure within one to two weeks of regular consumption. The speed depends on the dose, the type of licorice, and your individual sensitivity. Real licorice contains a compound called glycyrrhizin, which causes the body to retain sodium and lose potassium, directly driving blood pressure up.

Why Does Licorice Affect Blood Pressure?

The active compound in true licorice root is glycyrrhizin. This natural chemical acts on your kidneys in a specific way. It blocks an enzyme that normally breaks down cortisol, a stress hormone.

When that enzyme is blocked, cortisol levels rise in the kidney. Cortisol then binds to a different receptor, one meant for aldosterone. Aldosterone controls salt and water balance. When cortisol activates that receptor, your kidneys hold onto sodium and excrete potassium.

Holding onto sodium pulls more water into your bloodstream. More water in your blood means higher blood volume. Higher blood volume increases the pressure against your artery walls. This mechanism is well established in medical literature.

This is not a speculative effect. The physiology is clear and reproducible in human studies. Some people are more sensitive than others, but the pathway is consistent.

How Quickly Does Licorice Raise Blood Pressure?

Regular daily intake of real licorice can raise blood pressure measurably within one to two weeks. In some sensitive individuals, changes can appear sooner, within a few days.

The timeline depends heavily on the amount of glycyrrhizin consumed. Higher doses act faster. Most case reports and clinical studies involve people eating licorice candy daily or drinking licorice tea for one to four weeks before noticing symptoms or measuring elevated pressure.

Blood pressure does not spike within minutes or hours of eating a single piece of licorice. This is a cumulative effect. The body needs repeated exposure for sodium retention to build up enough to change blood pressure readings.

However, the effect reverses relatively quickly once you stop. Blood pressure typically returns to baseline within one to two weeks after discontinuing licorice consumption. Potassium levels may take a bit longer to fully recover.

How Much Licorice Is Dangerous?

There is no universally safe dose of glycyrrhizin. Studies have shown effects at surprisingly low amounts.

Some research indicates that as little as 100 milligrams of glycyrrhizin daily can raise blood pressure in healthy adults. That amount is roughly equivalent to eating about 50 grams of real licorice candy per day, depending on the brand and concentration.

European regulators have set a guidance level of 100 milligrams of glycyrrhizic acid per day as a threshold to avoid adverse effects. Above that level, the risk of blood pressure elevation and potassium loss increases significantly.

Here is the challenge for consumers: most licorice candy labels do not list glycyrrhizin content. You cannot reliably calculate your dose from the nutrition label.

Some licorice products contain very little real licorice. Others are highly concentrated. The variation between brands is enormous. This makes predicting your individual response difficult.

Licorice or Anise: Knowing the Difference

Many products sold as licorice contain no actual licorice root at all. They are flavored with anise oil, which tastes similar but has no effect on blood pressure.

Real licorice flavor comes from the root of Glycyrrhiza glabra. Anise flavor comes from the seeds of the anise plant. They smell and taste alike, but they are chemically unrelated.

Check the ingredient list carefully. Look for “licorice root extract,” “licorice extract,” or “glycyrrhizic acid.” If you see “anise” or “anise oil” listed instead, the product is unlikely to affect your blood pressure.

Some products contain both real licorice and anise. In that case, assume the licorice component is active.

Another important distinction: “black licorice” is not always real licorice. Many black candies sold in the United States are actually anise-flavored. European black licorice is more likely to contain real licorice root.

Who Should Avoid Real Licorice?

Certain groups are more vulnerable to the blood pressure effects of licorice. If you fall into any of these categories, you should avoid real licorice entirely.

• People with high blood pressure: Licorice can push already elevated pressure into a dangerous range.
• People taking blood pressure medications: Licorice can interfere with diuretics and ACE inhibitors, making them less effective or causing unpredictable swings.
• People with heart disease or heart failure: Fluid retention from licorice can worsen symptoms.
• People with kidney disease: The potassium loss and sodium retention place extra strain on damaged kidneys.
• People taking digoxin or certain heart rhythm medications: Licorice-induced potassium loss increases the risk of dangerous heart rhythm disturbances.
• Pregnant women: High glycyrrhizin intake during pregnancy has been associated with potential developmental concerns. No safe level has been established for pregnancy.

If you are healthy and have normal blood pressure, occasional small amounts of real licorice are unlikely to cause problems. The risk increases with daily consumption and larger quantities.

What Are the Other Health Risks of Licorice?

Blood pressure elevation is not the only concern. Licorice also causes potassium loss, which can be dangerous on its own.

Low potassium, called hypokalemia, can cause muscle weakness, cramping, fatigue, and irregular heart rhythms. In severe cases, it can lead to cardiac arrest.

The combination of high blood pressure and low potassium is particularly dangerous. It increases the risk of stroke and heart rhythm problems beyond what either condition would cause alone.

Some people develop swelling in their hands and feet from fluid retention before their blood pressure rises. Others notice fatigue or headaches first. These symptoms are signs that the licorice is having a physiological effect.

In rare cases, very high licorice intake has caused muscle breakdown, a condition called rhabdomyolysis. This is more likely in people who consume extremely large amounts over extended periods.

Most of these effects reverse when you stop eating licorice. However, if you have underlying health conditions, the effects can be more serious and take longer to resolve.

What Should You Do If You Have Symptoms?

If you have been eating real licorice regularly and develop a headache, feel unusually tired, or notice swelling, stop eating it immediately. These can be early signs of elevated blood pressure.

Check your blood pressure if you have a home monitor. If it is elevated, contact your healthcare provider. They may want to check your potassium level as well.

If you experience chest pain, palpitations, severe weakness, or fainting, seek emergency care. These symptoms can indicate a dangerous drop in potassium or a serious blood pressure elevation.

Do not try to self-treat with potassium supplements. Taking potassium without knowing your actual level can be dangerous, especially if you have kidney problems. Let a healthcare provider guide your treatment.

Be honest with your clinician about how much licorice you consumed. Many people do not think to mention it, but this information is critical for making the correct diagnosis. Licorice-induced hypertension looks like other forms of high blood pressure in testing, so the dietary history is essential.

How Long Does the Effect Last After Stopping?

Blood pressure usually returns to normal within one to two weeks after stopping licorice. The duration depends on how much you consumed and how long you consumed it.

People who ate large amounts for months may take longer to recover. Their potassium levels may also stay low for a while, especially if they have other risk factors for potassium depletion.

In most reported cases, the effects are fully reversible. Permanent damage from licorice is rare and typically only occurs in people with severe underlying disease or those who consumed extremely large amounts.

The key is stopping early. The longer you continue eating licorice, the more pronounced the electrolyte and blood pressure changes become. Early recognition and discontinuation lead to faster recovery.