Working in adult mouse wound-healing models, the researchers found that an ethanol-based rosemary extract improved healing speed and mitigated fibrosis. They then isolated carnosic acid, a major bioactive compound in rosemary leaves, as a key driver of the effect. Mechanistic experiments suggested carnosic acid activates TRPA1, a nociceptor expressed on cutaneous sensory neurons; when TRPA1 was absent in sensory neurons, the pro-regenerative response was lost.   

Beyond faster closure, the team reported features consistent with more regenerative repair, including restoration of skin appendages such as hair follicles and oil glands in treated wounds, aligning the findings with pathways that shift healing away from scar-dominant outcomes.   

The authors position the work as a potential starting point for accessible, topical approaches to improving skin repair outcomes, but note clear translational constraints.  

The evidence is currently limited to animal models, and the formulation tested (ethanol-based extract and a carnosic-acid cream) may not map directly to commercially available “rosemary” skincare products or to real-world use patterns. Human trials will be needed to determine safety, dosing, irritation risk, and whether similar anti-fibrotic effects occur in human wounds.