Nutrients/Active Ingredients:   Salicylic acid, flavonoids, carotenoids, phosphorous, Vitamin A and C.
Uses by system and symptom: 
Cardiovascular: Used as a tonic for heart and circulation.
Digestive/Gastrointestinal: Has been used as a mouth rinse to help with sore throat, thrush, blisters, and inflamed gums. Used on gastric ulcers
Integumentary/Skin:  Thought to have skin-healing properties. Used on acne, scraped/itchy/inflamed skin, skin infections like athlete's foot. Calendula is used to alleviate itchy scalp in a hair rinse, to disinfect wounds, cold sores, swelling, sprains, eczema, psoriasis, and bug bites. 
Skeletal: arthritis
Nervous: conjunctivitis
Immune:  anti-inflammatory, antimicrobial, and fever
Lymphatic:  congested lymph nodes and to help detoxify.
Common doses and preparation:  1-2 teaspoon most common dose. See specific recipes for more specific doses. Flowers and petals used. Most often used as a oil, tincture, infusion, or tea.  Small amounts of tea are used to make diaper wipes for diaper rash.  Eye rinses used for viral pink eye, dryness, and allergies.  People add calendula to soups, broths, teas, cordials, and smoothies. Used in baths for your skin.  Added to lavender as a foot soak for stress and strain.  
Side Effects/Precautions/Interactions: Thought to be gentle enough to be used on most people and pets safely.
* This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. For educational purposes only. We recommend speaking with a physician or health care professions, especially if you have medical conditions, are pregnant or lactating, on medications, or use with children and infants.