Longevity doctor explains why taking too much vitamin D supplements might be dangerous

In recent years, vitamin D has received enormous attention. From bone health to immune support, it seems like the miracle nutrient. Many people now take vitamin D supplements daily, often believing “more is better.

” But among the many voices promoting its benefits, one longevity doctor is issuing a caution: blindly supplementing vitamin D without checking what your body actually needs may carry unintended risks.

What vitamin D supplements are all about

Vitamin D plays key roles: it supports bone health by helping calcium absorption, contributes to immune function, and supports hormone balance. Dr. Vass notes that people often take it “just in case,” without checking their own blood levels.

According to him, while insufficiency is indeed common, taking high doses of supplements without monitoring can backfire. He states: “Vitamin D is critical for bone health, immune health and hormone balance—but here is the truth: most people take it blindly without ever checking their levels.

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What the doctor says about calcium buildup and damage to arteries & kidneys

Dr. Vass warns that too much vitamin D can cause calcium buildup in places it doesn’t belong, especially arteries and kidneys.

He writes: “Yes insufficiency is common, but too much vitamin D can backfire, causing calcium buildup that can damage your arteries and your kidneys.”

Research backs Dr. Vass's arguments. A careful review called “Vitamin D in Vascular Calcification: A Double-Edged Sword?” argues that vitamin D can be protective at the right levels but harmful in excess, since both deficiency and overload have been linked to vascular calcification.That framing helps explain why scientists warn against one-size-fits-all dosing: the same molecule that supports bone health can contribute to unwanted calcium build-up if levels are pushed too high.Other studies add nuance to that concern. One analysis of calcium and vitamin D supplementation observed that excessive supplementation may be associated with an increased risk of cardiovascular problems, suggesting the relationship is not simply linear.

Meanwhile, clinical reports of vitamin D toxicity describe cases where hypervitaminosis D was tied to extensive arterial calcium-phosphate deposits (mostly apatite crystals), reinforcing the biological plausibility of harm when vitamin D is overused.

What the doctor says is the best way to take supplements

Dr. Vass’s advice is clear: don’t supplement blindly. He says you need a simple blood test to determine your actual vitamin D level.

He adds: “For some it can be a game-changer; for others it is unnecessary or maybe even harmful.”In addition, he emphasises that vitamin D doesn’t work alone. You also need magnesium (to activate vitamin D) and vitamin K2 (to guide calcium into bones instead of arteries).You can start with a blood test to measure your 25-hydroxyvitamin D (25-OH D) levels before deciding whether you need supplementation at all.If your test shows low levels, supplementation should still be guided by a qualified physician rather than self-prescribed mega-doses. This allows your doctor to determine the right dosage and duration for your body’s needs.Disclaimer: The information provided in this article is for educational purposes only and is not intended as medical advice. Always consult with a healthcare professional before starting any new medication or treatment.