Calendula has high amounts of flavonoids, plant-based antioxidants that protect cells from being damaged by unstable molecules called free radicals. Calendula appears to fight inflammation, viruses, and bacteria.
Traditionally, calendula has been used to treat stomach upset and ulcers, as well as relieve menstrual cramps, but there is no scientific evidence that calendula works for these problems. Today, calendula is often used topically, meaning it is applied to the skin.
Calendula has been shown to help wounds heal faster, possibly by increasing blood flow and oxygen to the affected area, which helps the body grow new tissue. It is also used to improve skin hydration and firmness. The dried petals of the calendula plant are used in tinctures, ointments, and washes to treat burns, bruises, and cuts, as well as the minor infections they cause. Calendula also has been shown to help prevent dermatitis or skin inflammation in people with breast cancer during radiation therapy.
Calendula tinctures, ointments, and washes are often applied to the skin to help burns, bruises, and cuts heal faster, and to fight the minor infections they cause. Calendula cream is also used to treat hemorrhoids.
Calendula is generally considered safe to use on your skin. DO NOT apply it to an open wound without a doctor's supervision. People who are allergic to plants in the daisy or aster family, including chrysanthemums and ragweed, may also have an allergic reaction to calendula (usually a skin rash).
Pregnant and breastfeeding women should not use calendula. In theory, calendula could interfere with conception, and possibly cause miscarriage, so couples trying to get pregnant should not use calendula.
Source: https://www.stlukes-stl.com/health-content/medicine/33/000228.htm
FDA Statement: Not intended to diagnose, prevent, treat or cure through the sale of this herb. Use at your own risk. The information provided is for informational purposes only and is not intended to take the place of consultation with your physician.
Supporting Research
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