Calendula tea is best known for reducing inflammation, supporting digestive healing, and fighting mild infections. Made from the bright orange petals of Calendula officinalis (commonly called pot marigold), this herbal tea delivers a concentrated dose of plant compounds that work as antioxidants, anti-inflammatories, and antimicrobials. Most of the research on calendula involves topical applications, but drinking it as a tea has a long history of internal use, particularly for the mouth, throat, and gut.
Digestive and Tissue Healing
The most practical use of calendula tea is healing irritated or damaged tissue along the digestive tract. The tea has traditionally been taken to soothe the mouth, throat, stomach lining, and intestines. Its anti-inflammatory compounds help calm swollen or ulcerated tissue, while its antimicrobial properties reduce the risk of secondary infection in wounds that are already healing.
The wound-healing evidence is striking even when the tea is used externally on open sores. In one study on diabetes-related foot ulcers, 78% of participants who used calendula tea saw complete healing. Another study found that 72% of participants using calendula tea on leg ulcers fully healed, compared to fewer than a third in the control group. While these studies involved topical application rather than drinking the tea, they demonstrate how effectively calendula promotes tissue repair. Internally, the same anti-inflammatory and cell-regenerating properties apply to the lining of your digestive system.
Anti-Inflammatory and Antioxidant Effects
Calendula’s flowers are packed with two major classes of protective compounds: flavonoids and triterpenoids. The triterpenoids are responsible for much of the plant’s anti-inflammatory punch. They work by dialing down the production of a key inflammatory signaling molecule called TNF-alpha, which your body releases in response to infection or injury. When TNF-alpha stays elevated, it drives chronic inflammation. Calendula helps keep that response in check.
The flavonoids and carotenoids (the pigments that give the flowers their orange color) act as antioxidants, neutralizing unstable molecules that damage cells over time. This combination of anti-inflammatory and antioxidant activity is what makes calendula useful across so many different contexts, from sore throats to skin irritation to muscle fatigue. It doesn’t target one specific organ. It reduces the underlying inflammatory and oxidative processes that drive discomfort in many parts of the body.
Antimicrobial Properties
Calendula has measurable activity against bacteria and fungi. Lab testing found that a water extract of calendula flowers (essentially a strong tea) showed the broadest spectrum of antibacterial activity among the preparations tested. It was the only calendula preparation that showed effectiveness against E. coli, a common cause of digestive and urinary infections. The plant also demonstrates activity against Candida albicans, the fungus behind most yeast infections and oral thrush.
This antimicrobial quality is one reason calendula tea has been used as a mouth rinse and gargle for sore throats, mouth sores, and gum inflammation. Drinking it lets the tea make direct contact with tissues in the mouth and throat before it reaches the stomach, giving it a topical effect on the way down.
Immune System Effects
Calendula appears to modulate immune function rather than simply “boosting” it. In laboratory studies, calendula extract enhanced the proliferation of lymphocytes (a type of white blood cell central to immune defense) when those cells were already activated by foreign material. At the same time, it showed an inhibitory effect on lymphocyte activity when cells were stimulated by a general trigger alone. In practical terms, this suggests calendula may help your immune system respond more effectively to real threats without overreacting to harmless stimuli. This dual action is why researchers describe it as “immunomodulatory” rather than simply immune-boosting.
How To Brew Calendula Tea
Use 1 to 2 tablespoons of dried calendula flowers per cup. Heat water until it’s simmering, meaning small bubbles are rising from the bottom of the pot. Don’t use a full rolling boil, which can degrade some of the delicate plant compounds. Pour the hot water over the flowers, cover the mug with a small plate or saucer, and steep for 15 to 20 minutes. The long steep time matters: calendula petals are thicker than typical tea leaves and need more time to release their active compounds into the water. The resulting tea has a mild, slightly earthy, faintly sweet flavor.
Covering the mug while steeping is important because it traps volatile compounds that would otherwise escape as steam. You can strain the petals out or leave them in. Some people add honey or lemon, though the tea is mild enough to drink on its own.
Safety and Who Should Avoid It
Calendula tea is generally safe for most people. Memorial Sloan Kettering Cancer Center notes it is safe to consume in food and tea. However, calendula belongs to the Asteraceae family, the same botanical family as ragweed, chamomile, chrysanthemums, and sunflowers. If you have a ragweed allergy, you may cross-react with calendula. Roughly 20% to 30% of people with ragweed allergies experience cross-reactions with related plants like chamomile, and calendula carries a similar risk. Symptoms can range from mild oral itching to a more pronounced allergic response.
Pregnant and breastfeeding women are typically advised to avoid calendula tea, as it has historically been considered a uterine stimulant. People taking sedative medications should also use caution, as calendula may enhance their effects. If you’re on medication for blood pressure or diabetes, check with your pharmacist before adding calendula tea to your routine, since it may interact with how those drugs are metabolized.