Shilajit: Side Effects Reported in Clinical Trials

Our article shilajit: dangers and precautions already identifies the main, statistically most common risk: unpurified or counterfeit resins, which may contain heavy metals. This one takes a different, complementary angle: what do the reference scientific literature and a human clinical trial precisely report about the tolerance of purified, authentic shilajit?

What the reference review says on pharmacology and toxicology

A review by Wilson, Rajamanickam, Dubey and co-authors, published in 2011 in the Journal of Ethnopharmacology, surveys the available data on the composition, pharmacology and safety of shilajit as used in traditional Indian medicine (see the review on Google Scholar). The authors note that raw, unpurified shilajit can contain undesirable compounds (heavy metals, mycotoxins) depending on its geographic origin and processing, but that properly purified shilajit — meaning stripped of these contaminants through traditional or industrial purification methods — shows an overall favorable safety profile in reported traditional uses. It is this distinction between raw and purified substance that shapes most of the precautions worth knowing about this product.

What the human clinical trial reports

A clinical trial by Biswas, Pandit, Mondal and co-authors, published in 2010 in the journal Andrologia, evaluated a purified, standardized shilajit in men with oligospermia (low sperm count), with a 90-day follow-up (see the study on Google Scholar). Beyond the results on sperm parameters, which remain preliminary and allow no promise of effectiveness, this work is useful for what it documents on tolerance: participants received a standardized daily dose for three consecutive months, an exposure duration rare in the shilajit literature, with no serious adverse effect requiring the study to stop reported by the authors. This is one of the few trials to document extended, supervised human use, with a product whose purity was controlled.

What these two sources allow you to conclude, without overreaching

Question	What the data show	Limitation
Is purified shilajit well tolerated over 90 days?	No serious adverse effect reported in the available clinical trial	A single trial, limited sample, specific population (men with oligospermia)
Is raw shilajit safe?	No, per the 2011 review, due to the risk of contaminants depending on origin	Varies by source and degree of purification
Is there data on very long-term use (several years)?	No, no data available	Complete absence of a trial of this length

Minor adverse effects reported in the literature

Beyond the contamination risk already covered in our article on shilajit's dangers, the minor adverse effects occasionally reported in the available literature remain digestive (mild nausea, altered stools) and mostly occur early in use or at a high dose — a profile consistent with many mineral and plant supplements introduced gradually into the body.

How to apply this data in practice

• Require purified shilajit, with a certificate of analysis, the central condition the 2011 review highlights for a favorable safety profile;
• Stick to a reasonable course length, similar to what was tested in the available clinical trial (a few weeks to three months), rather than continuous use without a break;
• Start at a moderate dose to limit the risk of digestive discomfort early on;
• Keep in mind the lack of very-long-term data, which is a reason not to turn an occasional course into a permanent habit without reassessment.

Precautions

For purified, authentic shilajit, the available data — a reference review and a 90-day clinical trial — are reassuring on short-to-medium-term tolerance. They don't remove the precautions already detailed in our article shilajit: dangers, particularly around counterfeiting risk, which remains the most concrete point of vigilance. For general guidance, see our safety and precautions guide.