Since the discovery and clinical application of penicillin, microbial natural products have played a critical role in protecting public health. However, the emergence and wide spread of drug-resistant pathogens pose a new grave threat to humankind and make this issue one of the world’s most severe public health problems. New chemical entries with antimicrobial activities, new mechanisms, or novel therapeutic methods are urgently needed for drug development. By exploring new sources, new technologies in separation and structural elucidation, genome mining, and synthetic biology, natural product research is entering a new golden age.This Special Issue on natural products with antimicrobial activities covers the discovery of new secondary metabolites, new mechanisms, and new therapeutic methods for potential application in antimicrobial drug screening and development.

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Phytotherapy is probably the oldest form of medicine; however, it represents a new therapeutic tool for healthcare workers. Indeed plants are an infinite source of novel molecules, with countless possible combinations. This collection of articles (a Special Issue from Molecules) brings together the most up-to-date studies on the use of plant-derived compounds, ranging from their anti-inflammatory, antioxidant, and anticancer effects to the revision of the prominent literature.

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For centuries, nature has been an inspirational source for the discovery of drugs used in modern medicine. Nowadays, natural-based treatments continue to be employed for primary health care, particularly playing a significant role in folk medicine. In addition, we are currently observing an increasing use of natural-products-based supplements from botanical and marine sources, making their standardization and scientific validation a priority to guarantee the safety of these products. Natural products and/or synthetic derivatives using their novel structures have also been of utmost importance in drug discovery and development in several clinical areas. After a period of discreditation and reduced investment, we are now witnessing a renewed interest from the pharmaceutical industry and scientific community due to the urgent need to develop new drugs. This reprint comprises 11 original and 6 review articles dedicated to plant and marine natural products research, contributing to the scientific validation of their use and opening new perspectives in drug discovery

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With the development of analytical instruments, the academic system has become more complicated, producing new journals one after another. Therefore, it became much important to clarify what is original of “Medicines”. As the name Medicines indicates, it includes science and practice of caring for a patient and managing the diagnosis, prognosis, prevention, treatment or palliation of their injury or disease. Therefore, Medicines differs from other journals with similar title in that it covers a wide range of fields, from traditional medicine to rapidly developing molecular-targeted drugs, focusing on their pharmacological effects, structure–activity relationships, metabolic pathways, gene expression, using cultured cells, animals, and clinical trials. Most parts of this Special Issue were written by our editorial board members, who described the research topics and how they are engaged in their field of research. All of these articles are their life-long story. We collected a total number of 22 original works by basic researchers and clinical doctors. We hope that readers can get a chance to know the current status of diverse fields of medicines, and what your most important research themes are after reading these articles.

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Natural products and the preparations based on them play a stable and ever-increasing role in human and veterinary medicine, agriculture, in food and the cosmetic industry, and in an increasing number of other fields. Their importance is based on the fact that they are mostly bound to renewable sources, which in fact makes them valuable within a circular economy, inter alia. At the same time, natural products provide the origin of stereochemistry, optical activity, regioselectivity, chirality, and many other concepts and directions within science, development, and industry in a scope, which is indispensable. They serve as a constant powerful stimulus and model that inspires researchers to create new effective tools, similar to natural ones, for controlling bioregulation mechanisms and solving practical problems. This was the reason for organizing this Special Issue aimed at underlining the current developments in all the fields connected to natural products.

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