主题词：Phytochemistry Medicinal Plant Applications; Pharmaceutical studies and practices; Analytical Methods in Pharmaceuticals; Pharmaceutical Practices and Patient Outcomes; Botanical Research and Chemistry; Botanical Research and Applications; Public Health in Brazil; Essential Oils and Antimicrobial Activity; Analytical Chemistry and Chromatography; Sesquiterpenes and Asteraceae Studies; Agricultural and Food Sciences; Pharmacology and Obesity Treatment; Medical research and treatments; Psidium guajava Extracts and Applications; Plant Toxicity and Pharmacological Properties; Pharmacological Effects and Assays; Natural Products and Biological Research; Plant Taxonomy and Phylogenetics; Enzyme Catalysis and Immobilization; Antibiotics Pharmacokinetics and Efficacy; Chemical synthesis and alkaloids; Phytochemistry and Biological Activities; Mediterranean and Iberian flora and fauna; Heavy Metals in Plants; Plant tissue culture and regeneration