Archive · 10 Nov 2025
Longevity Doctor Warns Against Blind Vitamin D Supplementation
Taking too much vitamin D is like giving your body too much of something good, and it can actually be bad.
It can make your body absorb too much calcium, which can then get stuck in the wrong places like your blood vessels and kidneys.
This can make your arteries hard or cause kidney stones.
Vitamin D also needs help from other things like magnesium to work right, and Vitamin K2 to make sure calcium goes into your bones, not your arteries.
So, instead of just taking vitamin D pills, it's better to get a blood test to see if you really need it.
You can also get these nutrients from foods like nuts, leafy greens, and certain dairy.
Always talk to a doctor before starting supplements.
Supplementing with vitamin D without checking blood levels can be risky, according to longevity doctor Dr Vass.
Excess vitamin D can cause calcium buildup, potentially damaging arteries and kidneys.
Magnesium is needed to activate vitamin D, and vitamin K2 is essential to direct calcium into bones.
Early signs of vitamin D overdose include nausea, vomiting, fatigue, and changes in thirst or urination.
A blood test (25-hydroxy vitamin D) is recommended to determine levels, with 30-50 ng/mL considered adequate for most adults.
- Who
- Longevity doctor Dr Vass and Dr Jagadish Hiremath, Public Health Intellectual
- What
- Warning against taking vitamin D supplements without testing levels, highlighting risks of overdose and the importance of other nutrients like magnesium and vitamin K2.
- When
- Recent post and discussions by the doctors.
- Where
- General health advice, applicable globally.
- Why
- Excess vitamin D can lead to harmful calcium buildup in arteries and kidneys; testing and professional guidance are crucial for safe and effective supplementation.
- Risks of Excess Vitamin D
- Calcium buildup in arteries and kidneys, potentially leading to stiffened blood vessels, kidney stones, or kidney damage.
- Early Signs of Overdose
- Nausea, vomiting, constipation, fatigue, increased thirst or urination.
- Key Nutrients for Vitamin D Balance
- Magnesium (activates vitamin D) and Vitamin K2 (directs calcium to bones).
- Dietary Sources of Magnesium
- Nuts, leafy vegetables, whole grains.
- Dietary Sources of Vitamin K2
- Fermented foods, cheeses, egg yolks.
- Recommended Testing Frequency
- Every 6-12 months for those on supplements or with risk factors.
- Safe Vitamin D Blood Level Range
- 30 to 50 ng/mL for most adults.