Cinnamaldehyde, derived from Cinnamomum cassia and other species, has diverse pharmacological effects and mechanisms. It is produced through natural extraction, synthetic methods, and biotechnology, offering scalable and sustainable alternatives. This review summarizes recent studies on cinnamaldehyde's therapeutic effects, molecular interactions, and clinical potential. It highlights its efficacy in treating inflammatory conditions, bacterial infections, cancer, diabetes, and cardiovascular and kidney diseases. Cinnamaldehyde primarily inhibits the NF-κB pathway, modulates pro-inflammatory mediators, disrupts bacterial cells, and induces cancer cell apoptosis. It improves metabolic health by enhancing glucose uptake and insulin sensitivity and provides cardiovascular protection through anti-inflammatory and lipid-lowering effects. It also promotes autophagy in kidney disease management. Preclinical and clinical research supports its therapeutic potential, emphasizing the need for further investigation into its mechanisms and safety to develop new drugs based on cinnamaldehyde. Cinnamaldehyde exhibits anti-inflammatory effects by suppressing H. pylori-induced gastritis, ulcerative colitis, periodontitis, and psoriasis-like inflammation. It inhibits the NF-κB pathway and reduces inflammatory cytokines, thereby alleviating inflammation. In rheumatoid arthritis, cinnamaldehyde inhibits the proliferation and migration of fibroblast-like synoviocytes (FLS), reducing joint damage. It also suppresses allergic rhinitis by reducing vascular congestion and inflammatory cell infiltration. Cinnamaldehyde has strong anti-microbial effects against Salmonella, E. coli, S. mutans, and A. hydrophila. It disrupts bacterial cell membranes, inhibits growth, and reduces inflammation. It also exhibits anti-tumor activity by inducing apoptosis in various cancer cells, including breast, ovarian, hepatocellular, gastric, and non-small cell lung cancer (NSCLC). It inhibits the PI3K/AKT pathway, reduces cell proliferation, and promotes autophagy. In colorectal cancer, cinnamaldehyde inhibits tumor growth by modulating signaling pathways and reducing malignant phenotypes. Overall, cinnamaldehyde shows promise as a therapeutic agent for various diseases, with further research needed to fully understand its mechanisms and safety.Cinnamaldehyde, derived from Cinnamomum cassia and other species, has diverse pharmacological effects and mechanisms. It is produced through natural extraction, synthetic methods, and biotechnology, offering scalable and sustainable alternatives. This review summarizes recent studies on cinnamaldehyde's therapeutic effects, molecular interactions, and clinical potential. It highlights its efficacy in treating inflammatory conditions, bacterial infections, cancer, diabetes, and cardiovascular and kidney diseases. Cinnamaldehyde primarily inhibits the NF-κB pathway, modulates pro-inflammatory mediators, disrupts bacterial cells, and induces cancer cell apoptosis. It improves metabolic health by enhancing glucose uptake and insulin sensitivity and provides cardiovascular protection through anti-inflammatory and lipid-lowering effects. It also promotes autophagy in kidney disease management. Preclinical and clinical research supports its therapeutic potential, emphasizing the need for further investigation into its mechanisms and safety to develop new drugs based on cinnamaldehyde. Cinnamaldehyde exhibits anti-inflammatory effects by suppressing H. pylori-induced gastritis, ulcerative colitis, periodontitis, and psoriasis-like inflammation. It inhibits the NF-κB pathway and reduces inflammatory cytokines, thereby alleviating inflammation. In rheumatoid arthritis, cinnamaldehyde inhibits the proliferation and migration of fibroblast-like synoviocytes (FLS), reducing joint damage. It also suppresses allergic rhinitis by reducing vascular congestion and inflammatory cell infiltration. Cinnamaldehyde has strong anti-microbial effects against Salmonella, E. coli, S. mutans, and A. hydrophila. It disrupts bacterial cell membranes, inhibits growth, and reduces inflammation. It also exhibits anti-tumor activity by inducing apoptosis in various cancer cells, including breast, ovarian, hepatocellular, gastric, and non-small cell lung cancer (NSCLC). It inhibits the PI3K/AKT pathway, reduces cell proliferation, and promotes autophagy. In colorectal cancer, cinnamaldehyde inhibits tumor growth by modulating signaling pathways and reducing malignant phenotypes. Overall, cinnamaldehyde shows promise as a therapeutic agent for various diseases, with further research needed to fully understand its mechanisms and safety.