Medicinal Properties of Calendula
"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....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.... 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 breast cancer patients during radiation therapy." 
Calendula is known to stimulate menstruation. It is suggested to prevent or treat muscle spasms, reduce fever, treat sore throat , certain ulcers, and ease menstrual cramps.
It is believed that the chemicals in calendula encourage new tissue growth in wounds and decrease swelling in the mouth and throat. As calendula stimulates menstruation pregnant women should not ingest it
Modern medicines are largely based on, or have incorporated into them - plant compounds. Herbal teas are basically a form of medicine, somewhat primitive and primal, somewhat unharnessed. When abused , or used incorrectly side effects - sometimes unwanted and unsuspected are unleashed. Exercise due caution when tinkering with herbal teas for medicinal purposes.
Calendula Tea Recipe
A very simple calendula tea can be made with a tabelspoon of dry calendula flowers. Place the flowers in a heat resistant cup - pour the boiling water over them and allow to steep for about 20 minutes. If using fresh flowers, fill the cup with flowers - then pour boiling water over it. Allow it to infuse for 20 - 30 minutes. Strain of the liquid and that's your tea. Stevia, sugar, honey and other enhancements can be added to titillate your taste buds.
For Sun tea fill a glass jar about 1/4 full with dried flowers, if using fresh flowers fill it the rim and cover with water [not hot water]. Put a lid on it and place out in the sun or a sunny window for most of the day. Once the tea is completely infused, strain it and enjoy.
Some can be saved for an iced tea, but not loo long, only a day - maybe two. Unlike store bought teas, it contains no preservatives other than what Mother nature provided, the natural bacteria within it will expedite its decomposition [you could get sick].
Using an InfuserTea Infuser
2 teaspoons dried calendula flower petals, 1 cup of boiling water. Place calendula petals in an infuser and pour 1 cup of boiled water over the petals. Allow the calendula to steep for 10 to 15 minutes. Then enjoy.
Another method of making an infusion is to add a cup of dried herbs to a quart jar. Pour boiling water over the herbs to the top of the jar. You should also place a metal spoon or utensil in the jar when you are pouring the hot water if you are using glass. The metal will absorb the sudden heat and prevent the glass from shattering.
Remove the metal utensil and cover the jar tightly with a lid. Let the herbs steep up to 10 hours and then strain.
Calendula petals picked later in the season are sometimes very bitter. Sweetening with honey or other enhancements is advisable. Calendula can also be infused with other herbs for additional benefits.
Calendula is also commonly called Pot Marigold, but do not confuse other varieties of marigolds with calendula!
1. University of Maryland Medical Center