The purpose of this study is to investigate the effects of a combined vitamin D and magnesium supplementation on parathyroid hormone and cardiometabolic health in persons living with obesity.

Individuals living with obesity are at a higher risk of cardiometabolic abnormalities and high circulating parathyroid hormone. There is evidence suggesting that vitamin D may play a role in cardiovascular health outcomes; however, the research is currently inconclusive. Magnesium is a cofactor of vitamin D metabolism, and the prevalence of concurrent vitamin D and magnesium deficiency is high. This study aims to investigate the effect of vitamin D and magnesium supplements in individuals who are overweight and obese on parathyroid hormone and cardiometabolic health.

Inclusion Criteria:

• BMI range 25-40 kg/m2
• 30-70 years of age

Exclusion Criteria:

• Presence of any acute illness in the past month
• Pre-existing chronic medical conditions or medications know to influence energy, vitamin D, magnesium and calcium metabolism, levels of blood glucose, lipids and blood pressure
• Individuals taking vitamin D and magnesium supplement greater than the Recommended Daily allowance
• Participants taking any medications or have disease known to influence calcium or bone metabolism