Calendula ointment for breast-radiotherapy skin reactions

Evidence label: Positive randomized signal, formulation-specific · Clinical goal: prevent grade 2 or worse acute radiation dermatitis

Evidence at a glance

Population: 254 people receiving postoperative breast radiotherapy.
Intervention: a specified Calendula officinalis ointment after each session versus topical trolamine.
Result: grade 2 or worse dermatitis occurred in 41% versus 63%, with fewer interruptions and less pain; calendula was harder to apply.

What was studied

The 2004 phase III trial randomized 126 participants to Pommade au Calendula par Digestion and 128 to trolamine. The primary endpoint was grade 2 or worse acute dermatitis.

The study compared two active skin-care strategies rather than calendula with an inert vehicle or modern standard topical steroid protocol.

What the evidence shows

Grade 2 or worse dermatitis occurred in 41% with calendula and 63% with trolamine (absolute difference 22 percentage points; P<.001). Radiation interruptions and pain were less frequent, but application was more difficult.

A later systematic review of natural products did not find a consistent pooled grade 2+ benefit for calendula across the broader evidence base. The strongest signal therefore remains product- and comparator-specific.

Limits and uncertainty

The positive trial is older and does not establish superiority to current evidence-based radiation skin care. Blinding was impractical, and topical product composition matters.

The systematic review found substantial variation across agents and methods; this is not a class effect for all calendula creams.

Safety and practical context

Do not apply an unapproved product immediately before radiation unless the treatment team specifies timing. Avoid broken or infected skin, and stop for contact dermatitis or worsening irritation.

Calendula belongs to the daisy family and can trigger allergy. The studied ointment should not be assumed equivalent to homemade preparations, oils or cosmetic creams.

Questions for the care team

Does my radiation clinic allow this exact formulation and timing?
What product is the clinic using as standard care, and is a topical steroid indicated?
Which skin changes require same-day assessment or a treatment-plan adjustment?

Sources

Literature searched: October 15, 2026 · Record appraised: October 15, 2026

Educational evidence summary, not personal medical advice. Research regimens describe what was studied; they are not personal prescribing instructions and should not replace cancer treatment or individualized supportive care.