Calendula

Calendula Officinalis

Generally SafeSkin & Wound CareDigestive HealthImmune Support

Medicinal Facts

Calendula officinalis, commonly known as calendula, is renowned for its triterpenoid saponins and flavonoids, particularly quercetin and isorhamnetin. It stands at the intersection of traditional herbal medicine, where it is used for wound healing and skin conditions, and modern pharmacological research focused on anti-inflammatory and antimicrobial activity. The plant's bioactive compounds are explored for their roles in modulating inflammatory pathways and enhancing skin regeneration, with a particular emphasis on NF-kB inhibition and cytokine modulation.

What it helps with

Wound healing

Calendula's triterpenoid saponins and flavonoids, such as isorhamnetin, promote wound healing by enhancing collagen synthesis and modulating the NF-kB pathway, which reduces pro-inflammatory cytokines like IL-1 and IL-6. This action is supported by both traditional use and in vitro studies demonstrating increased fibroblast activity and epithelialization.

Skin inflammation & dermatitis

The flavonoids in calendula, notably quercetin, inhibit the release of histamine and leukotrienes, reducing skin inflammation. They also modulate the NF-kB pathway, lowering TNF-a and IL-1b levels. Clinical trials support its use in reducing symptoms of dermatitis and eczema, with a favorable safety profile.

Antimicrobial activity

Calendula extracts exhibit antimicrobial properties, largely attributed to its essential oils and flavonoids, which disrupt microbial cell walls and inhibit biofilm formation. This is particularly noted against Staphylococcus aureus and Candida albicans, with evidence from in vitro studies.

Oral health

Calendula's anti-inflammatory and antimicrobial properties, driven by its flavonoids and saponins, support oral health by reducing gingivitis and oral microbial load. It inhibits the growth of oral pathogens and reduces inflammation via NF-kB pathway modulation, as supported by small-scale clinical studies.

Gastrointestinal health

Traditionally used for gastrointestinal discomfort, calendula's saponins and flavonoids reduce inflammation in the gut by modulating NF-kB and COX-2 pathways. This action helps in conditions like gastritis and peptic ulcers, with evidence primarily from animal studies.

Menstrual discomfort

Calendula may alleviate menstrual cramps through its anti-inflammatory effects, mediated by the inhibition of prostaglandin synthesis via COX-2 inhibition. This traditional use is supported by anecdotal evidence and small observational studies.

Antioxidant support

The flavonoids in calendula, such as quercetin, act as potent antioxidants, scavenging free radicals and upregulating endogenous antioxidant enzymes like superoxide dismutase (SOD). This contributes to cellular protection and anti-aging effects, with evidence from in vitro assays.

Key active compounds

Quercetin

A flavonoid that inhibits NF-kB and COX-2, reducing inflammation and oxidative stress. It also stabilizes mast cells, reducing allergic responses. Quercetin's bioavailability is moderate, often enhanced by co-administration with other polyphenols.

Isorhamnetin

A methylated flavonoid that modulates inflammatory pathways by inhibiting NF-kB and reducing cytokine release. It also exhibits antioxidant properties, contributing to its protective effects on skin and mucosal tissues.

Triterpenoid saponins

These compounds enhance wound healing by promoting collagen synthesis and modulating inflammatory pathways. They also exhibit antimicrobial properties by disrupting microbial membranes.

Calendic acid

A fatty acid unique to calendula, contributing to its anti-inflammatory effects by modulating lipid metabolism and prostaglandin synthesis. It also supports skin barrier function.

Carotenoids (lutein and zeaxanthin)

These pigments provide antioxidant support, protecting cells from oxidative damage. They also contribute to the vibrant color of calendula flowers and support eye health.

Essential oils

Comprising compounds like alpha-cadinol and gamma-cadinene, these oils exhibit antimicrobial and anti-inflammatory properties. They enhance the overall therapeutic profile of calendula extracts.

Polysaccharides

These compounds have immunomodulatory effects, enhancing macrophage activity and supporting the immune response. They also contribute to the soothing and hydrating properties of calendula.

What the research says

Research on calendula focuses on its anti-inflammatory, antimicrobial, and wound-healing properties. Human trials support its use in dermatological applications, particularly for wound healing and dermatitis, with flavonoids like quercetin showing the strongest evidence. Preclinical studies emphasize its antimicrobial efficacy against common pathogens, with essential oils and saponins being key contributors. The primary limitation is the variability in compound concentration across different preparations, addressed by standardizing extracts and focusing on specific bioactive components like flavonoids and saponins.

Typical dosage

For tea or infusion, use 1-2 teaspoons of dried calendula petals per cup of boiling water, steep for 10 minutes, and drink up to three times daily. For tinctures, take 1-2 ml up to three times a day. For topical applications like salves or oils, apply to the affected area as needed. Always perform a patch test before using calendula topically to check for allergic reactions.

About Calendula

Calendula officinalis, commonly known as calendula or pot marigold, is a flowering plant in the Asteraceae family. It is renowned for its vibrant orange and yellow flowers, which have been used for centuries in herbal medicine. Calendula is prized for its skin-healing properties, making it a staple in salves, creams, and ointments designed to treat minor cuts, burns, and skin irritations. The plant contains a variety of active compounds, including flavonoids, saponins, and triterpenoids, which contribute to its anti-inflammatory, antimicrobial, and wound-healing effects. Traditionally, calendula has been used across cultures to support skin health and treat various skin conditions such as eczema, psoriasis, and acne. It is also used internally as a tea or tincture to soothe digestive issues, reduce inflammation, and support menstrual health. Calendula's immune-boosting properties are attributed to its ability to enhance lymphatic drainage and stimulate the immune system. Modern research supports many of these traditional uses, highlighting calendula's potential in promoting wound healing and reducing inflammation. Calendula's versatility extends to its use in cosmetics and culinary applications. The petals are often used as a natural dye or flavoring agent in foods. While generally safe for most people, those with allergies to the Asteraceae family should use calendula with caution. Overall, calendula remains a popular and effective natural remedy for a wide range of health concerns.

Traditional Use

Calendula has a long history of use in traditional medicine, dating back to ancient Greece and Rome, where it was used for its healing properties. The plant was favored by herbalists and physicians, including the famous herbalist Nicholas Culpeper in the 17th century, who documented its use for various ailments. Calendula has been utilized in Ayurvedic and traditional Chinese medicine as well, highlighting its global significance. Over the centuries, its applications have evolved, and it remains a staple in herbal medicine and natural skincare today.

Preparations & Dosage

Preparations

Tea / Infusion: Place 1-2 teaspoons of dried calendula petals in a cup. Pour boiling water over the petals and cover. Let it steep for 10 minutes, then strain the petals. Drink warm, optionally adding honey or lemon for flavor.
Tincture: Combine 1 part dried calendula petals with 5 parts alcohol (such as vodka) in a glass jar. Seal tightly and store in a cool, dark place for 4-6 weeks, shaking occasionally. Strain the liquid into a dark glass bottle.
Salve: Melt 1 cup of coconut oil or beeswax in a double boiler. Add 1/4 cup of dried calendula petals and simmer on low heat for 1-2 hours. Strain the mixture and pour into a container to cool and solidify.
Oil infusion: Fill a jar with dried calendula petals and cover with a carrier oil (such as olive or almond oil). Seal and place in a sunny window for 4-6 weeks, shaking occasionally. Strain and store in a dark bottle.
Poultice: Crush fresh calendula petals and mix with a small amount of water to form a paste. Apply directly to the affected area and cover with a clean cloth. Leave on for 20-30 minutes.

Interactions & Warnings

Calendula may interact with sedative medications, potentially enhancing their effects. It should be used cautiously in individuals taking blood pressure medications, as it may have a mild hypotensive effect. Additionally, those with allergies to the Asteraceae family should avoid calendula. At high doses, calendula may cause drowsiness or skin irritation in sensitive individuals.

Use with caution

Calendula is generally considered safe for most people. However, individuals with allergies to plants in the Asteraceae family, such as ragweed, daisies, or marigolds, should exercise caution. Pregnant or breastfeeding women should consult a healthcare provider before use.