This is a summary of research papers and studies
from the National Center for Biotechnology Information (NCBI)
ABOUT CALENDULA EXTRACT
Calendula officinalis, commonly known as pot marigold and a member of the Asteraceae family, has been a cornerstone of traditional medicine for centuries. Historically utilized for treating minor skin inflammations and aiding in the closure of minor wounds, its therapeutic value is now increasingly recognized by modern regulatory bodies. Contemporary research has delved into its complex chemical composition, revealing a multifaceted plant extract with antimicrobial, anti-inflammatory, and regenerative properties that offer significant benefits for skin health.
Properties
The primary therapeutic efficacy of calendula is derived from its rich array of bioactive compounds, including phenolic acids, phenylpropanoids, and triterpenes. These components contribute to the extract's robust antimicrobial activity, often performing comparably or even superior to standard pharmaceutical treatments like Fluconazole in certain laboratory settings. This makes calendula a potent natural candidate for managing skin conditions complicated by bacterial or fungal infections.
Wound Healing and Tissue Regeneration
One of the most documented functions of Calendula officinalis is its ability to accelerate wound healing. Research involving full-thickness skin wounds has shown that topical application of a 5% aqueous calendula extract can significantly reduce wound area in as little as seven days.
The mechanism behind this acceleration involves several critical biological processes:
- Fibroblast Activation: Calendula promotes the proliferation of fibroblasts and increases levels of fibroblast growth factor, which are essential for creating the structural framework of new tissue.
- Collagen Synthesis: It increases hydroxyproline levels, a key amino acid that serves as a precursor to collagen, thereby enhancing the strength and integrity of the healing skin.
- Granulation Tissue Support: In vitro studies indicate that calendula extracts can inhibit the activity of collagenase, an enzyme that breaks down collagen, thus helping to maintain the newly formed granulation tissue.
Protection Against Environmental and Medical Stress
Beyond physical trauma, calendula provides significant protection against oxidative stress induced by ultraviolet (UV) radiation and medical treatments. Topical formulations containing calendula extract, particularly gel-based preparations, have demonstrated a "photoprotective effect". In studies of UVB-induced skin damage, these formulations helped maintain levels of reduced glutathione, a critical antioxidant that protects skin cells from oxidative damage. Furthermore, the extract has been associated with improved collagen synthesis following UV exposure, suggesting potential anti-aging benefits by preserving skin elasticity.
Safety
While calendula is widely accepted and available as an over-the-counter preparation, it is not without risks. Although rare, instances of contact dermatitis have been documented. The exact allergens in calendula remain unidentified, but the plant's high content of phenolic acids is suspected to trigger Type IV hypersensitivity reactions in sensitized individuals.
Conclusion
Calendula officinalis extract serves as a powerful topical agent with a diverse range of functions, from combating pathogens and speeding wound closure to protecting against radiation and UV damage. Its ability to stimulate collagen production and modulate inflammatory pathways makes it an invaluable ingredient in both clinical and cosmetic skin care. However, users should remain aware of the potential for allergic sensitization.