Quick answer: Your kidneys filter your blood, balance fluids and electrolytes, regulate blood pressure and activate vitamin D. The biggest threats to kidney health are high blood pressure, diabetes, chronic inflammation and overuse of certain medications. Protecting them means controlling blood pressure and blood sugar, staying hydrated, limiting NSAIDs and checking kidney function regularly.
What the kidneys do
- Filter waste and excess fluid from the blood
- Balance sodium, potassium and other electrolytes
- Help regulate blood pressure
- Activate vitamin D
- Signal red blood cell production
What harms the kidneys
- High blood pressure
- Diabetes and high blood sugar
- Long-term NSAID use and some other medications
- Dehydration
- Smoking
Habits that protect kidney health
- Keep blood pressure and blood sugar in range (see managing blood sugar naturally)
- Drink enough water for your body and activity
- Use NSAIDs sparingly and as directed
- Eat plenty of vegetables and limit ultra-processed, high-sodium foods
- Move daily
Nutrients and herbs
Some herbs, such as astragalus and cordyceps, and nutrients such as omega-3s, CoQ10 and NAC are studied for kidney support. However, many supplements, herbs and minerals (including magnesium and potassium) can be harmful when kidney function is reduced. Use them only with a provider who knows your kidney labs. If you work with me, the products I use are in my Fullscript dispensary.
Testing
Kidney function is checked with eGFR (from creatinine, and sometimes cystatin C) and a urine albumin-to-creatinine ratio. See cystatin C and kidney longevity. Functional labs are optional. They can be helpful in more complex cases, and in my practice they are available only to patients working 1-on-1 with me.
Kidneys and healthy aging
Kidney function naturally declines with age, and inflammation, high blood sugar and oxidative stress speed it up. Senescent cells accumulate in aging kidneys. Protecting blood pressure, blood sugar and blood vessels is the best way to keep kidneys working. Related: inflammaging.
When to see a naturopathic doctor
- You have high blood pressure or diabetes and want to protect your kidneys
- Your eGFR is declining
- You want to know which supplements are safe for your kidneys
- You have a history of kidney stones
See a medical provider promptly for little or no urine output, swelling in the legs or face, blood in the urine, or severe flank pain.
Want to protect your kidneys for the long term?
A free 15-minute consultation with Dr. Kneessi. No cost, no obligation. In-office in Odenton, MD or by telehealth.
Frequently asked questions
How can I keep my kidneys healthy?
Control blood pressure and blood sugar, stay hydrated, limit NSAIDs and get regular kidney tests.
Do kidney cleanses work?
There is no evidence that cleanses improve kidney function. Some can be harmful.
Are supplements safe for kidneys?
Many are not safe with reduced kidney function. Check with your provider first.
What is cystatin C?
It is a blood marker of kidney function that may be more accurate than creatinine in some people.
Sources
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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