Coumarins in the human–nature nexus: Exploring their environmental and psychological footprint

Coumarins, a diverse family of naturally occurring compounds, offer a remarkable window into the deep and dynamic relationship between humans and the natural world. Found in plants, fungi, and even insects, these benzopyrone derivatives are not only known for their pharmacological versatility but also for their cultural, psychological, and ecological resonance. This review journeys through the multifaceted narrative of coumarins—from their ancient medicinal uses and spiritual significance to their contemporary relevance in environmental sustainability and mental health. Historically used in embalming rituals and herbal remedies, coumarins have been quietly shaping human experience for centuries. Their fragrant presence in essential oils and plant-based incense once framed sacred spaces and contemplative practices, hinting at their subtle but lasting psychological impact. Today, coumarins are gaining renewed interest not only for their anti-inflammatory, antimicrobial, and antioxidant properties but also for their potential role in mood regulation, cognitive enhancement, and neuroprotection. Their influence on monoamine pathways suggests applications in stress relief and emotional well-being—key concerns in the modern, often nature-deprived lifestyle. Environmentally, coumarins act as plant defense agents and ecological messengers, influencing biodiversity, herbivore behavior, and even soil microbiota. Their allelopathic and biocidal properties position them as vital tools in green chemistry and sustainable agriculture. Furthermore, interdisciplinary collaborations now explore coumarins in fields ranging from biomedicine and biotechnology to aromatherapy and environmental psychology. This review highlights coumarins not just as biochemical agents but as symbolic links in the human–nature nexus—agents of healing, communication, and balance. Understanding their roles across ecosystems, cultures, and psychological dimensions is essential for developing sustainable strategies that respect both biodiversity and human well-being. In an era of ecological uncertainty and emotional fragmentation, coumarins offer a fragrant reminder that nature and humanity are deeply, chemically, and spiritually entwined.