Mumiyo Side Effects: Kidneys, Heavy Metals and Who Should Avoid It
The short answer
Most healthy adults tolerate well-purified mumiyo (also called mumiya, mumiyan or shilajit) at the usual small amounts. The side effect people mention most is a mildly upset stomach. The bigger risks are poor-quality or unpurified products, which can carry heavy metals, and certain health conditions. Anyone with kidney disease, high iron, gout, or who is pregnant, breastfeeding or under 18 should avoid it or ask a doctor first.
In Saudi Arabia, one of the most common searches about mumiyo is simply "what are its side effects?", and it's the right question to ask. Here's what is actually known, without scaremongering and without playing anything down.
The common side effects
Stomach upset. Some people feel mild nausea or discomfort, especially on an empty stomach. Taking it with food or reducing the amount usually solves it.
The taste. Genuine resin is bitter and earthy. It isn't harmful, but it puts some people off. Dissolving it in warm water, tea or milk with a little honey helps.
Individual reactions. As with any food or supplement, some people react to it. If you notice anything unusual, stop and speak to a doctor.
The real risk: quality
Raw mumiyo comes out of rock. Before purification it contains stone and soil, and it can carry heavy metals such as lead and arsenic, plus microbes if it was collected or stored badly. This isn't a theoretical worry: a 2008 study in JAMA bought traditional Ayurvedic products online and found detectable lead, mercury or arsenic in about one in five of them.
That's why unlabelled pieces sold loose, with no origin and no test results, are the riskiest way to buy mumiyo. A reputable seller should show an independent lab report covering heavy metals, microbes and aflatoxins. Our guide to shilajit lab testing explains what each result means, and authentic vs fake shilajit covers the warning signs.
Is mumiyo bad for your kidneys?
Searches about mumiyo and the kidneys are common in the Gulf, so it's worth being precise. There are no good human studies showing that purified mumiyo harms healthy kidneys. But there are also no studies showing it is safe for people whose kidneys already don't work normally.
Two things make caution sensible. First, mumiyo naturally contains minerals, including potassium and iron, and people with kidney disease often have to control these carefully. Second, if a product is contaminated with heavy metals, the kidneys are among the organs that take the strain. So if you have chronic kidney disease, kidney stones, are on dialysis or have had a transplant, don't take mumiyo unless your doctor agrees. If your kidneys are healthy, the most important protection is a clean, tested product at the recommended amount.
Who should avoid mumiyo or speak to a doctor first?
Avoid it during pregnancy and breastfeeding, and don't give it to children or anyone under 18. Ask a doctor first if you have kidney disease, high iron levels, gout, or any long-term condition, or if you take regular medication, especially for blood pressure, diabetes, the thyroid, or blood thinners. See Who Should Not Take Shilajit? and Shilajit and Medications.
How to lower the risk
Buy from a seller with a clear origin and a recent lab report. Start with a small amount, about the size of a grain of rice, and don't exceed the amount on the label. Take it with food if your stomach is sensitive, and stop if anything feels wrong. Our usage guide covers amounts and timing. For the names mumiyo goes by in Arabic, see Shilajit in Arabic.
Minerals Pitch
Our shilajit comes from Gilgit-Baltistan in northern Pakistan and is purified with water, filtration and sun drying, with nothing added. Every batch is tested by an independent lab for heavy metals, microbes and aflatoxins, and the results are on our lab reports page. Choose the Himalayan Shilajit Resin (30g) or the Shilajit Drops (30ml). In Saudi Arabia, our Black Gold Shilajit liquid is registered with the SFDA and ships from inside the Kingdom.
Frequently asked questions
What are the side effects of mumiyo?
The most common is a mildly upset stomach, usually on an empty stomach. The bigger risk is unpurified or contaminated product, which can contain heavy metals.
Is mumiyo bad for the kidneys?
There's no good evidence that purified mumiyo harms healthy kidneys, but there's no safety data for people with kidney disease. If you have a kidney condition, don't take it unless your doctor agrees.
Can I take mumiyo every day?
Many healthy adults take a small amount daily within the label's recommendation. Long-term data is limited, so anyone with a health condition should check with a doctor.
How do I know if mumiyo is safe to buy?
Look for a clear origin and an independent lab report covering heavy metals, microbes and aflatoxins. Avoid loose, unlabelled pieces.
This article is for general information only and isn't a substitute for advice from your doctor. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle. Do not exceed the recommended daily amount.