S-(5′-Adenosyl)-L-methionine iodide is widely used in biochemical research, particularly in the study of methylation processes. It serves as a methyl group donor in enzymatic reactions, making it essential for investigating DNA, RNA, and protein methylation. This compound is also utilized in the synthesis of various biomolecules and in the development of therapeutic agents targeting methylation-related disorders. Additionally, it plays a role in studying cellular metabolism and the regulation of gene expression. Its applications extend to the field of neuroscience, where it is used to explore the impact of methylation on neurotransmitter synthesis and brain function.