Is Calendula Safe? What You Should Know

Calendula has a long track record of use in food, tea, and topical preparations, and for most adults using it in normal culinary or cosmetic amounts, it is well tolerated. But like any herb with a significant botanical history, there are contexts where caution is warranted — and a few specific groups who should approach it more carefully or avoid it.

This article covers what is currently known about calendula's safety profile: who should be cautious, what interactions have been noted, and what the regulatory and research landscape looks like.

General Safety for Most Adults

Calendula officinalis is included in the European Medicines Agency (EMA) community herbal monographs for both oral (traditional use) and external applications. The EMA's assessment reflects centuries of documented use and a reasonable safety profile for adults using the herb in conventional amounts — teas, infused oils, topical preparations — without evidence of systemic toxicity at normal doses.

In culinary use, calendula petals have a long history as a food ingredient and colorant in European cuisine, which informs a reasonable baseline for low-level oral exposure. At tea quantities (1–2 teaspoons of dried flowers per cup, 1–3 cups per day), no significant adverse effects have been reported in the published literature for healthy adults.

Asteraceae Allergy: The Primary Caution

The main safety concern with calendula is cross-reactivity in people with known allergies to plants in the Asteraceae (Compositae) family. This family includes ragweed (Ambrosia), chrysanthemums, daisies, chamomile, echinacea, and related plants.

People with ragweed hay fever or known sensitivities to other Asteraceae plants have an elevated risk of allergic reactions to calendula — both topical and oral. Reactions can range from contact dermatitis (with topical use) to more systemic responses in cases of significant sensitivity. Anyone with confirmed Asteraceae allergies should consult a healthcare provider before using calendula preparations in any form.

Even without a known allergy history, a patch test before widespread topical application is a reasonable precaution for anyone with sensitive skin: apply a small amount of the infused oil or preparation to the inside of the wrist, wait 24 hours, and look for any redness, itching, or swelling.

Pregnancy and Nursing

Traditional herbalism has historically cautioned against using calendula during pregnancy — particularly oral preparations at therapeutic doses. This caution appears in multiple herbal reference texts, including Grieve's A Modern Herbal and the EMA monograph guidance.

The basis for this caution includes emmenagogue properties attributed to calendula in traditional texts (plants described as stimulating menstrual flow), though the clinical evidence base for this specific effect is limited. The precautionary principle favors avoidance of non-essential herbal preparations during pregnancy, particularly in the first trimester, until more data are available. Nursing is similarly cited as a period of caution in several authoritative herbalism references.

If you are pregnant or nursing and interested in using calendula — topically or internally — discuss it with your healthcare provider or midwife before proceeding.

Topical vs. Oral Use

Topical use (infused oil applied to skin, salves, washes) is generally considered to carry lower systemic risk than oral use, because the quantities reaching the bloodstream through intact skin are far smaller. The EMA community herbal monograph notes external use as a category with a longer track record and broader traditional use. That said, topical applications can still trigger contact dermatitis in sensitive individuals, particularly those with Asteraceae allergies.

Oral use — tea, culinary use, tinctures — involves direct systemic exposure and is subject to more of the cautions above, particularly for people with medical conditions, those taking medications, and during pregnancy.

Drug Interactions

The research on calendula's drug interactions is limited. Some preclinical studies suggest potential sedative properties, raising theoretical concern about additive effects with sedative medications, anesthetics, and central nervous system depressants. This is a theoretical caution rather than one with strong clinical evidence, but it is typically flagged in herbal reference literature.

Anyone taking prescription medications — particularly immunosuppressants, sedatives, or medications with narrow therapeutic windows — should consult their prescribing physician or pharmacist before adding calendula preparations to their routine.

Regulatory Status

In the United States, calendula is sold as a dietary supplement and botanical ingredient. It is on the FDA's "generally recognized as safe" (GRAS) list as a food ingredient (petals used for flavoring and coloring). As a supplement, it is not subject to pre-market approval, and health claims are subject to FTC and FDA guidelines that require substantiation.

In Europe, the EMA community herbal monograph provides a framework for traditional use claims. Calendula products sold for external use or as an oral traditional herbal medicine can reference this monograph in several EU jurisdictions.

Related Articles

• What Is Calendula? An Introduction to the Plant and Its Uses
• How to Make Calendula Tea
• Calendula in Skincare: Traditional Uses
• How to Make Calendula-Infused Oil
• The History and Traditional Use of Calendula

Sources and References

• European Medicines Agency. Community herbal monograph on Calendula officinalis L., flos. EMA/HMPC/679928/2013. 2009.
• Grieve M. A Modern Herbal. 1931. Reprinted Dover Publications, 1971.
• Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics. 2nd ed. Wiley, 1996.
• Brinker F. Herb Contraindications and Drug Interactions. 4th ed. Eclectic Medical Publications, 2010.
• FDA. Substances Generally Recognized as Safe (GRAS). 21 CFR Part 182.

The content on this page is for educational purposes only and is not intended as medical or nutritional advice. Consult a qualified healthcare provider with any questions about your health, medication interactions, or use of herbal preparations during pregnancy or nursing.