Used as a source of magnesium in chemical synthesis and catalysis, particularly in organic reactions where a mild, soluble magnesium salt is required. Commonly employed in the preparation of catalysts for polymerization processes and in the textile and leather industries as a mordant for dyeing fabrics to enhance color durability. Also utilized in environmental testing and water analysis for the determination of biochemical oxygen demand (BOD) due to its role in supporting microbial growth. In laboratories, it serves as a reagent in buffer solutions, enzymatic studies, and molecular biology applications such as PCR (Polymerase Chain Reaction), where controlled magnesium levels are essential for enzyme activity like DNA polymerase. Additionally, it can be used as a niche additive in fertilizers or agricultural products to supplement magnesium essential for plant photosynthesis. Its tetrahydrate form provides stability and ease of handling in moisture-controlled environments.