Kidney "detox" and supplements: what actually works

Dr. Joan J. Morales Lappot, MD
3 min read · Leer en español

In briefSearch for kidney health online and you will find teas, cleanses and pills that promise to "detox" or even cure kidney disease. Before spending money on them, it helps to know what the evidence says.

Your kidneys are the detox

Healthy kidneys filter your entire blood volume many times a day. No tea or cleanse has been shown to improve kidney function or reverse kidney disease. Products that promise a cure usually deliver only a lighter wallet.

Supplements that can harm the kidneys

• Herbal products containing aristolochic acid, linked to kidney failure
• High-dose vitamin C, which turns into oxalate and can cause stones
• Large amounts of turmeric, which is rich in oxalate
• Licorice root, which can raise blood pressure and lower potassium
• Creatine, which raises creatinine and can confuse test results
• Star fruit (carambola), which can be dangerous for people with kidney disease
• Potassium-based salt substitutes and some "alkalizing" products

Why caution matters

Supplements are not tested the way medicines are. Doses vary, labels can be wrong and some products contain hidden ingredients. Damaged kidneys also clear these substances more slowly, so they build up.

What actually helps

• Blood pressure and blood sugar control
• Less salt and more fresh, plant-based foods
• Staying active and not smoking
• Avoiding NSAID pain relievers
• Taking only the medicines that have a clear reason to be on your list

If a supplement interests you, bring the bottle to your visit and we will look at the evidence together.