Calcium-Magnesium Balance—Clinical Implications for Global Human Health

Calcium (Ca) and magnesium (Mg) function as physiological opposites, and their ratio (Ca: Mg) is a key indicator of health status and disease risk. An imbalanced ratio—outside the optimal range of 1.7 to 2.6—has been associated with conditions such as cancer, cardiovascular disease, dementia, and infections, including complications from COVID-19 and post-COVID syndrome. Obesity is both a cause and a consequence of Ca: Mg imbalance. While traditionally measured by dietary intake (mg/day), evaluating Ca: Mg levels in the blood as mmol/L provides a more physiologically relevant perspective. Mean values for ionized Ca and Mg yield iCa: iMg that aligns with this optimal physiological range. However, since Mg ions circulate in both RBCs and plasma versus Ca ions, a 3:2 intake ratio may better support homeostasis than the commonly recommended 2:1 ratio. As Mg is essential for vitamin D synthesis, maintaining the ideal Ca: Mg ratio may enhance the conversion of vitamin D3 to 25(OH) D and the interaction of calcitriol with vitamin D receptors—potentially improving outcomes with lower vitamin D doses and significantly benefiting clinical outcomes and global health. However, the benefits of a balanced ratio extend well beyond that due to improved vitamin D efficacy. However, the benefits of a balanced ratio extend well beyond that due to improved vitamin D efficacy. Magnesium is crucial to the function of G-protein coupled receptors (GPCRs), critical to cell membrane signaling, CYP450 enzymes, activation of B vitamins, methylation of the epigenome, glucose metabolism, and to delay age linked oxidative stress and inflammaging. Magnesium deficiency may directly contribute to the global epidemic of type 2 diabetes and its symptoms overlap those of aging. Laboratory reference ranges, NHANES data, and pertinent recent peer reviewed reports offer objective support to speculative conclusions that require clinical validation.