Calendula (Calendula officinalis) is a common garden plant used medicinally in Europe, China, the United States, and India. Calendula has been used for jaundice, it is a well-known anti-inflammatory herb, diaphoretic, analgesic, antiseptic and as an antispasmodic.
Calendula contains many active substances such as saponins, flavonoids, and carotenoids that have antioxidant activity and are necessary for the immune system. 
Calendula tea is an extremely healing herb for sore throat, as in case of sore throat, gargling with calendula tea three times a day is recommended. Calendula is useful for sore throat because of its ability to reduce swelling and pain. [2,3]
Calendula as an aid in digestion
Calendula extracts also aid in digestion, as they can protect the lining of the stomach and intestines from ulcers. It is used for inflammations of the intestinal mucosa, and spasms of the gastrointestinal tract . Calendula is also an excellent choice for athletes and those who engage in daily intense exercise, as it prevents muscle spasms.
Calendula can reduce menstrual pain
It is also an excellent choice for the menstrual cycle, as it is known to reduce menstrual pain by affecting prostaglandins. Due to its estrogenic action, it reduces menstrual cramps and relieves breast tenderness. 
1. Vahed R., Kermanshahi H., Nasiri Moghaddam H., Hassanabadi A., Beheshti Moghaddam S. Effect of different levels of marigold (calendula officinails) oil extract on performance, blood parameters and immune response of broiler chickens challenged with CCl4. Iran J Anim Sci Res. 2016;7:447–455.
2. Foroutankhah, M., Toghyani, M., & Landy, N. (2019). Evaluation of Calendula officinalis L. (marigold) flower as a natural growth promoter in comparison with an antibiotic growth promoter on growth performance, carcass traits and humoral immune responses of broilers. Animal nutrition (Zhongguo xu mu shou yi xue hui), 5(3), 314–318.
3. AshwlayanVD, Kumar A, Verma M, et al. Therapeutic Potential of Calendula officinalis. Pharm Pharmacol Int J. 2018;6(2):149-155.