PCR and High-Fidelity DNA Polymerases: Supplies Mg2+ cofactor (often as MgSO4) for proofreading polymerases and PCR optimization.

qPCR/RT-PCR Optimization: Adjusts Mg2+ levels to improve enzyme activity, specificity, and yield in quantitative and reverse-transcription PCR.

Restriction/Nuclease and Enzyme Assays: Provides essential Mg2+ for Mg2+-dependent nucleases, kinases, and ATPases.

Microbial Media Supplementation: Adds Mg2+ to defined and rich media (e.g., M9, LB) to support growth of Escherichia coli and other bacteria.

Yeast and Algal Media Formulation: Supplies magnesium in defined media (e.g., YNB, BG-11, f/2) for robust growth.

Transformation and Recovery Media: Used in SOB/SOC and recovery steps (including electroporation) to enhance cell viability and growth.

Bacteriophage Work: Included in SM buffer and plating overlays to promote phage adsorption, stability, and plaque formation.

Ribosome/Nucleic Acid Stabilization: Stabilizes ribosomes and folded nucleic acids in extraction and storage buffers.

Cell-Free Expression Systems: Tunes Mg2+ concentration to optimize transcription-translation efficiency.

General Biochemical Titrations: Enables precise Mg2+ titration to determine optimal conditions for Mg2+-dependent reactions.