What is Marigold (calendula)?

Marigold, or calendula, is a garden flower used mainly on the skin. The petals are made into creams, oils, washes and teas. People reach for it for minor cuts, grazes, chapped skin and nappy rash.

The plant is Calendula officinalis. German speakers call it Ringelblume. It is not the same plant as French or African marigold (Tagetes), which is grown for show.

Here is the honest verdict. Human evidence is limited and mixed. The best studied use is skin damage from radiation therapy, and even there the trials disagree.

Calendula has a long record in European folk medicine. That record is not proof that it works, and it is not proof that it is safe.

How does Marigold (calendula) work?

No one has shown exactly how calendula acts on skin. Most of what we know comes from lab dishes and animals.

In cell and animal studies, extracts appear to speed the growth of new skin cells. They also seem to raise collagen, the protein that knits a wound closed.

In test tubes, calendula slows some bacteria and fungi. Whether that happens on real skin is not established.

Lab work also points to a calming effect on swelling. That may be why folk healers used it on red, sore skin. It has not been confirmed in good human trials.

So treat the mechanism as a reasonable idea, not a proven fact.

What forms does Marigold (calendula) come in?

Calendula is used mostly on the skin, not swallowed.

Common forms: - Cream or ointment, often 2-10% extract - Infused oil, petals steeped in a plant oil - Tincture, an alcohol extract, often watered down for washes - Dried petals for a tea or skin rinse - Mouthwash and gargle products - Loose petals used as a food colouring

Some folk practice also takes the tea or tincture by mouth. Human evidence for swallowing it is very thin.

Alcohol tinctures can sting on broken skin. Many people dilute them in water first.

Where it comes from:

European folk healers used calendula for centuries on skin that was cut, burnt or sore. It appears in herbals from the medieval period onward.

In German-speaking Europe it was called Ringelblume and kept as a household salve. Folk use also covered sore mouths and, less often, stomach complaints.

The flower grew easily in gardens and cost nothing to pick. That kept it in home medicine long after costlier herbs faded.

The petals were also used to colour butter, soup and cheese. Cooks sometimes called it poor man's saffron.

What does Marigold (calendula) help with?

• Minor cuts and grazes: This is the oldest and most common use. Folk healers put calendula salve on small wounds to help them close. Human evidence here is weak. Small wounds heal on their own in most people. Keeping the wound clean matters more than what you put on it. Calendula is not a substitute for cleaning or for stitches.
• Mild skin irritation and chapping: Creams are sold across Europe for red, dry or chapped skin. European regulators allow this as a traditional use, based on long history rather than strong trials. Lab work suggests a calming effect on swelling. Good human trials are lacking. Any greasy cream can soften chapped skin. The calendula itself may add little.
• Nappy rash: Calendula ointments are widely sold for babies' bottoms. The folk idea is simple: a barrier that also soothes. Trials are few and small. One compared calendula with aloe gel and reported better results, but the study was small and poorly blinded. Zinc-based barrier creams have more support. Ask a pharmacist or health visitor first.
• Skin damage from radiation therapy: This is the best studied use, and it is a modern one, not a folk claim. A French trial in 254 women having radiation for breast cancer found less severe skin damage with calendula ointment than with a standard cream. Later trials and reviews have not settled it. Some found no clear gain. Do not start any cream during radiation without asking your cancer team. Some products must be kept off the skin before a session.
• Sore mouth and throat, as a rinse: Folk practice used a cooled tea as a gargle for sore gums and throats. A few small trials have tested calendula mouthwash for mouth sores caused by cancer treatment. Results look mildly positive but the studies are small. Spit the rinse out. Alcohol tinctures sting an already sore mouth.
• Slow-healing wounds and leg ulcers, under medical care: Some small studies have used calendula dressings on leg ulcers and diabetic foot ulcers. The studies are small and hard to compare. They do not prove a benefit. These wounds need proper medical care. Treating them at home with a herbal cream can let an infection spread.

Which foods are rich in Marigold (calendula)?

1. Calendula petals used as a food colouring
2. Herbal teas blended with dried calendula flowers

Practical Tips:

Calendula petals are an old kitchen colouring. Cooks stirred them into butter, cheese and broth, and called the flower poor man's saffron.

The amounts used in food are tiny. No health benefit should be expected from them.

Petals are also scattered on salads for colour.

What are the side effects of Marigold (calendula)?

• Allergic skin rash (contact dermatitis), with itching and redness
• Stinging or burning where it is applied, more likely on broken skin
• Mouth or throat irritation from alcohol-based tinctures
• Rare whole-body allergic reaction, with swelling or trouble breathing
• Drowsiness reported after swallowing large amounts, based on limited data

Good to know:

Most people use calendula creams without trouble. Side effects are uncommon and usually mild.

The main risk is allergy. People allergic to ragweed, daisies, chrysanthemums or marigolds react more often.

Serious reactions are rare but real. Stop at once if you get swelling of the face, lips or tongue.

How much Marigold (calendula) should you take?

• Recommended daily: This page gives label-type ranges only. It is not advice for you. Creams and ointments sold in Europe commonly carry 2-10% calendula extract. Labels usually say to spread a thin layer on clean skin a few times a day. Tea labels often list 1-2 g of dried flower per cup. Mouthwash products are usually a watered-down tincture, meant to be spat out. Ask a pharmacist or doctor before using it on a large, deep or infected wound.
• Best time of day: Time of day does not matter for skin use. People usually apply it after washing and again before bed. For a mouth rinse, after meals is the common habit. If you are having radiation, your team may ask you to keep creams off the skin for some hours before a session.
• With or without food: Food is not relevant for creams, oils or rinses. If you drink the tea, food makes little difference. Taking it with food may be gentler on the stomach. Swallowing calendula is not well studied, so there is no good guidance to give.
• Time to effect: If calendula helps mild irritation, people usually notice within a few days. Minor cuts and chapping often settle in that time anyway, cream or no cream. It may do nothing at all. If a wound looks worse rather than better, stop and see a doctor.
• How long to take it: Short courses are the norm. Most skin products are meant for days, not months. If your skin problem has not improved in about a week, stop and get it checked. Longer use raises the chance of an allergic rash. In radiation trials the cream was used through treatment, with staff watching the skin.