Vitamin D deficiency is widespread and has been linked to various health issues, including hypertension and heart disease.

Notably, those with obesity and low vitamin D levels saw the most significant benefits from supplementation.

Vitamin D deficiency is classified as having a blood level of 25 nmol/l or lower, which increases the risk of bone-related diseases.

Vitamin D may help regulate calcium levels, improve vascular function, and reduce inflammation, contributing to lower blood pressure.

A recent study involving 221 older adults with obesity examined the effects of vitamin D supplementation, with participants receiving either 600 IU or 3,750 IU daily over the course of a year.

Both dosage groups experienced significant reductions in blood pressure, with an average decrease of 3.5 mm Hg in systolic and 2.8 mm Hg in diastolic blood pressure.

Researchers identified a daily intake of 600 IU (15 mg) of vitamin D as optimal, finding that higher doses did not provide additional health benefits.

Experts advise that vitamin D supplementation should be part of a broader health strategy, which includes a healthy diet, regular exercise, and effective weight management.

While vitamin D supplementation is beneficial, it should be approached cautiously to avoid potential toxicity from excessive accumulation in the body.

Experts recommend testing vitamin D levels before starting supplementation and following a doctor's guidance on appropriate dosages.

High blood pressure remains a major health concern, often going undiagnosed in about a third of affected individuals and responsible for one in four deaths in the UK.

The study had limitations related to sample size and diversity, which may affect the applicability of its findings to broader populations.