Vitamin D is widely regarded as essential for bone health, immunity, and mood regulation. However, longevity expert Dr Vass warns that taking supplements without proper testing can be harmful. Many people supplement routinely without checking their blood levels first, which can lead to serious health risks. Excess vitamin D causes the body to absorb too much calcium, leading to deposits in soft tissues like arteries and kidneys. This buildup can stiffen blood vessels and cause kidney stones or damage. Early overdose symptoms include nausea, vomiting, constipation, fatigue, and increased thirst. Dr Vass emphasizes that vitamin D works with magnesium and vitamin K2 to properly direct calcium into bones rather than arteries. Experts recommend testing vitamin D levels every 6 to 12 months for those on supplements, with a safe range of 30 to 50 ng/mL for most adults. Supplementation should always be personalized and medically supervised.
Why Testing Before Supplementing Matters
Dr Jagadish Hiremath, Public Health Intellectual, explains that excessive vitamin D intake causes the body to absorb more calcium than necessary. This surplus calcium circulates in the bloodstream and deposits in soft tissues, including arteries and kidneys. Over time, these deposits stiffen blood vessels and may form kidney stones or damage kidney function. For adults on supplements or with risk factors, testing every 6 to 12 months using a 25-hydroxy vitamin D blood test is appropriate. The safe and adequate range for most adults is around 30 to 50 ng/mL. Very high levels become harmful, particularly when combined with high calcium intake. Personalized supplementation monitored by healthcare professionals is essential to avoid complications.
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