Pot marigold, applied mainly to the skin to calm inflammation and support early wound healing. Most studied for preventing radiation skin burns, with promising but inconsistent results. Modest signals for minor wounds and inflamed skin. Generally well tolerated; allergic skin reactions are the main concern. Inexpensive and low-risk, but benefits are not firmly established. (Full Review)

Protocol

Standard topical use

2–3× daily

Ointment, cream, or oil applied to clean skin

Radiation dermatitis

After each session

Ointment to the irradiated field, and between sessions

Reapplication

Every several hours

Topical actives act locally; divided across the day maintains effect

Time to effect

Soothing effect

Within days

For acute wounds and skin irritation

Measurable benefit

1 to several weeks

Wound-healing or anti-inflammatory benefit, with regular application

Reassessment point

2–4 weeks

If no improvement by then, seek conventional care

Benefits

Medium: Reduction of acute radiation dermatitis, acute wound and skin repair

Low: Anti-inflammatory effect in inflammatory skin conditions, treatment of vaginal infections, oral mucosal and gingival soothing

Speculative: Anti-tumor and anti-metastatic activity, general antioxidant and skin-aging support

Contraindications

Known Asteraceae-family allergy (ragweed, daisies, chrysanthemums, marigolds)

Internal use in pregnancy

Key Interactions

Oral calendula with sedatives (benzodiazepines such as diazepam)

Oral calendula with antihypertensives (amlodipine, lisinopril)

Risk & Side Effects

Medium: Allergic contact dermatitis and sensitization

Low: Local irritation, risks of oral and internal use

Speculative: Additive sedative or blood-pressure effects, hormonal and fertility effects

Monitoring

Marker	Target	Why
Skin allergy patch test response	No redness/itching at 24–48 h	Detects sensitization risk before wider use
Complete blood count (CBC)	Within normal limits	Baseline general health screen if considering prolonged oral use
Liver function tests (ALT, AST)	Within lab reference range; ~10–26 U/L	Screens for hepatic effects with prolonged internal botanical use

Cadence: Re-evaluate the treated area at each application; review progress at ~1 week, and again at 2–4 weeks.

Qualitative Assessment

Reduction in pain, stinging, or itching at the treated site
Visible reduction in redness, swelling, and weeping
Faster closure or healing of a wound
Improved comfort and skin appearance over days to weeks
Absence of new irritation or allergic reaction

Calendula officinalis for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment