The claim that vitamin D is the “#1 vitamin to stop proteinuria and repair kidneys” is not supported by strong evidence.
What is proteinuria?
Proteinuria means there is too much protein in the urine. It can be a sign of kidney damage and is commonly caused by:
- Diabetes
- High blood pressure
- Kidney diseases (such as glomerulonephritis)
- Some infections or medications
The goal is to treat the underlying cause, not just the protein in the urine.
What about vitamin D?
Vitamin D is important for:
- Bone health
- Muscle function
- Immune system function
People with chronic kidney disease are more likely to have low vitamin D levels, and treating a deficiency is important. However:
- Vitamin D does not repair damaged kidneys.
- It is not a proven treatment to stop proteinuria on its own.
- Taking high doses without medical supervision can be harmful, potentially causing high calcium levels and kidney stones.
Treatments with the strongest evidence for reducing proteinuria
Depending on the cause, healthcare professionals may recommend:
- Controlling blood pressure, often with ACE inhibitors or ARBs
- Managing blood sugar if diabetes is present
- SGLT2 inhibitors for many people with diabetes or chronic kidney disease, when appropriate
- Limiting excess dietary sodium
- Treating the specific kidney disease if one is identified
When to seek medical evaluation
If you’ve been told you have protein in your urine, it’s important to have it evaluated. Persistent proteinuria may require:
- Repeat urine testing
- Blood tests to check kidney function
- Blood pressure measurement
- Further testing depending on the suspected cause
If you’re asking because you’ve been diagnosed with proteinuria or kidney disease, tell me:
- Your age
- Whether you have diabetes or high blood pressure
- Your kidney function (if you know it, such as eGFR or creatinine)
- Whether a urine protein or albumin test has been done
I can explain what the results mean and discuss evidence-based treatment options.
