Shilajit Effects: What Do Studies Really Say?

In short: No health claims are authorised for shilajit in the EU – not a single one. The research consists of a few small human studies on individual topics (testosterone levels, fatigue and muscle strength, sperm quality) plus preclinical work that cannot be transferred to humans. This article reports what has actually been studied and what has not – without claims of effect, but with all the limitations.

Important: No health claims are authorised for shilajit/mumijo in the EU (Regulation (EC) No 1924/2006). This article reports neutrally on the state of research and makes no claims of effect.

Why this article sounds different from other "shilajit effects" texts

Anyone who googles "shilajit effects" finds lists full of promises: energy, hormones, anti-ageing, immune system. Legally, that is precarious – and in substance, usually far removed from what the research supports. The Health Claims Regulation (Regulation (EC) No 1924/2006) permits health-related advertising claims only if they have been assessed and authorised by the EU. For shilajit, mumijo and fulvic acid, not a single authorised claim exists. Serious sellers can therefore only do one thing: report the state of research as it is. That is exactly what this article does – study by study, with design, number of participants, duration and weaknesses. You will find no promises here, but something rarer: a complete, verifiable inventory whose sources you can read for yourself at the end of the article.

A second reason for the sober tone: the body of research is genuinely limited. There are no large, independent, repeatedly replicated studies on shilajit. Anyone suggesting otherwise is selling hope, not science.

The research at a glance

Topic area	Key study	Design	N	Duration	What was measured	Strength of evidence
Testosterone levels	Pandit et al., 2016, Andrologia	Randomised, double-blind, placebo-controlled	63 evaluated	90 days	Total and free testosterone in healthy men (aged 45–55), 2×250 mg purified shilajit daily	A single small study; replication by independent groups is lacking
Sperm quality	Biswas et al., 2010, Andrologia	Small clinical study without placebo control	28 evaluated	90 days	Sperm count and motility in men with reduced sperm count, 2×100 mg processed shilajit	Very small, no control group – at best hypothesis-generating
Fatigue & muscle strength	Keller et al., 2019, J Int Soc Sports Nutr	Randomised, double-blind, placebo-controlled	63	8 weeks	Retention of maximal strength after fatiguing exercise in physically active men, 250 vs. 500 mg daily	Small and short; a single performance parameter
Cognition	Carrasco-Gallardo et al., 2012, Int J Alzheimers Dis	Review of preclinical data	–	–	Cell and animal models on fulvic acid and brain ageing	Preclinical – not transferable to humans
High altitude & iron metabolism	Meena et al., 2010	Preclinical work / review	–	–	Traditional use at high altitude, animal models on iron parameters	Preclinical – not transferable to humans
Safety & tolerability	Stohs, 2014, Phytother Res	Review	–	–	Tolerability data on purified shilajit; contamination risks in raw material	Useful for assessing safety, not proof of effect

The data are not sufficient for authorised health claims. An even more detailed breakdown of all the studies – including their individual limitations – can be found in our study overview Shilajit Studies.

Testosterone levels and male fertility: the most-cited studies

The best-known shilajit study is by Pandit et al. (2016, Andrologia): in this randomised, double-blind, placebo-controlled study, healthy men between 45 and 55 received 250 mg of purified shilajit twice daily, or placebo, for 90 days; 63 participants were evaluated. Among the measurements were total and free testosterone, which were higher in the verum group at the end of the study than under placebo.

An honest assessment includes the weaknesses: this is a single, small study in a narrowly defined group. A patented proprietary extract was used, and an independent replication with the same design is still outstanding. What everyday relevance the measured differences in laboratory values have cannot be derived from the study – the authors themselves call for larger follow-up investigations.

The second frequently cited study is Biswas et al. (2010, Andrologia): a small clinical study without placebo control, in which 28 men with reduced sperm counts took 100 mg of processed shilajit twice daily for 90 days. Higher sperm counts and better motility at the end of the study were reported. Without a control group, however, it is impossible to say what share of the changes is attributable to the preparation – such studies are considered hypothesis-generating, not proof.

How these two studies read in detail, and what German search results make of them, is something we analyse separately in the article Shilajit & Testosterone. The data are not sufficient for authorised health claims.

Fatigue and muscle strength: the 2019 sports study

Keller et al. (2019, Journal of the International Society of Sports Nutrition) examined 63 physically active men over 8 weeks in a randomised, double-blind, placebo-controlled study. Doses of 250 mg and 500 mg of shilajit daily were compared with placebo; among other things, the study measured how much maximal voluntary muscle strength declined after a fatiguing exercise protocol. In the 500 mg group, this loss of strength at the end of the study was smaller than under placebo; laboratory parameters of connective tissue metabolism were also recorded.

Here too: a single, short study with a very specific endpoint in young, healthy men. It permits no statements about training effects in everyday life, other population groups or longer periods. The data are not sufficient for authorised health claims.

Brain, cognition and the like: almost all preclinical

On topics such as memory, brain ageing or concentration, the available data come almost exclusively from cell cultures and animal models. The review by Carrasco-Gallardo et al. (2012, International Journal of Alzheimer's Disease) summarises such preclinical findings on fulvic acid and brain ageing processes – and itself states that controlled human studies are lacking. These works are preclinical and not transferable to humans. Much the same applies to the tradition-inspired research on use at high altitudes (Meena et al., 2010): interesting hypotheses, no human evidence.

Why the research is so thin

That so few robust studies exist on a natural product used for centuries has understandable reasons – and knowing them helps put new headlines in perspective:

• No patent protection, little money: Shilajit as a raw material cannot be patented. Large, expensive study programmes therefore rarely pay off; what gets funded are mainly small studies on patented proprietary extracts from individual manufacturers – with the corresponding potential for conflicts of interest.
• Standardisation problem: Shilajit is a natural product whose composition varies depending on origin and processing. Results obtained with one extract cannot simply be transferred to other products – not even to ours.
• Small, homogeneous samples: The existing studies examined almost exclusively healthy men over periods of 8 to 12 weeks. Women, older people, long-term use: largely unresearched.
• Publication landscape: Positive results are more likely to be published than neutral ones – a well-known risk of bias that weighs particularly heavily in small fields of research.

None of this means that shilajit "does nothing" – it means we simply do not know for certain. It is precisely this distinction that separates reporting from advertising.

Tradition is not evidence – but it is a real context

Shilajit has been described in Ayurvedic literature for centuries, where it is classed as a "rasayana"; mumijo also has a long history in Russian and Central Asian folk tradition. This is well documented in cultural history and explains the enduring interest in the substance. From a legal and scientific perspective, however, these traditional uses are not to be equated with authorised health claims – tradition does not replace controlled studies. Unlike registered traditional herbal medicinal products, food supplements also have no "traditionally used for" exemption: as soon as a traditional use is linked to a health effect, the same strict rules apply as to any other advertising claim. We therefore describe the tradition as what it is – cultural history and the reason research is being done at all. More on the historical context in the article Shilajit in Ayurveda.

What is often claimed – and what has actually been studied

An honest overview also includes comparing marketing with the state of research. The most common claims from social media and advertising copy – and what the literature offers on them:

• "More energy": Human studies that examined energy or everyday tiredness as an endpoint do not exist for shilajit. What was examined was a specific muscle strength parameter after fatigue (Keller et al., 2019, see above). No claims on this are authorised.
• "Good for the immune system": No human studies with immune endpoints; a few isolated preclinical works – not transferable to humans. No such claim is authorised for shilajit.
• "Anti-ageing" and "skin & hair": The perennial social media favourite – without controlled human studies as a basis. What lies behind the hair hype is something we examine separately in the article Shilajit and Hair.
• "Testosterone booster": Shilajit may not be advertised this way – and the actual data basis (one small RCT with measured differences in laboratory values, see above) does not support this exaggeration in substance either.
• "Natural aphrodisiac": No. Shilajit is a food supplement, not a medicinal product, and may not be advertised with such effects. Studies on this question do not exist.

The pattern is always the same: small, specific measurement results or pure preclinical findings are turned into big everyday promises in marketing. The only serious path runs the other way – from the study to the cautious statement.

Mumijo, shilajit, fulvic acid: one field of research, three terms

When reading studies and guides, a clarification of terms helps: "shilajit" (Himalayan region) and "mumijo" (Russian and Central Asian region) essentially refer to the same natural product – research uses both terms, which makes literature searches confusing. "Fulvic acid", in turn, is not a preparation in its own right but a natural constituent whose proportion serves as a quality and standardisation criterion. You will find the details on origin and terminology in the articles Mumijo and Shilajit: Are They the Same? and What Is Shilajit?.

What can be said factually: the minerals

Aside from all the open research questions, shilajit is analytically well describable: an organo-mineral natural product with fulvic and humic acids (as a quality and standardisation criterion) plus a broad spectrum of minerals and trace elements. For some of these minerals, EU-authorised claims exist – they refer to the respective mineral, not to shilajit as a whole. Based on a daily dose of 0.9 g of our resin, for example:

• Magnesium (108% of the reference value): Magnesium contributes to a reduction of tiredness and fatigue and contributes to normal muscle function.
• Iron (31%): Iron contributes to normal oxygen transport in the body and to normal cognitive function.
• Calcium (72%): Calcium is needed for the maintenance of normal bones.
• Selenium (23%): Selenium contributes to the normal function of the immune system.
• Manganese (34%): Manganese contributes to the protection of cells from oxidative stress.

A varied, balanced diet and a healthy lifestyle are important – food supplements do not replace them. Note the difference from the rest of the discussion in this article: these sentences are assessed, authorised claims about individual minerals – not about shilajit as a whole and not about the open research questions of the studies above. The complete analysis of the composition can be found in the article Shilajit Ingredients.

How to recognise trustworthy information about shilajit

The market is full of exaggerations. These five test questions help you assess any source:

1. Are studies named with design, number of participants and duration – or is it just "studies show…"?
2. Are limitations mentioned (small samples, lack of replication, manufacturer funding)?
3. Is a distinction made between human studies and preclinical research?
4. Does the text refrain from healing promises and references to disease? Both are prohibited for food supplements – anyone who writes them anyway is ignoring applicable law.
5. Are original sources linked so that you can read them yourself?

We apply the same standard to products: traceable origin, standardisation to fulvic acids as a quality criterion and a certificate of analysis per batch – documented on our page Lab Tests & Quality. Safety topics are also part of an honest overall picture: we have summarised possible side effects and contraindications in the article Shilajit Side Effects, and the appropriate dosage in the article Shilajit Dosage.

Frequently asked questions about shilajit effects

Are the effects of shilajit scientifically proven?

No. There are a few small human studies with measured differences in certain laboratory values and performance parameters – that is something different from robust proof of effect. There are no authorised health claims for shilajit.

How quickly does shilajit "work"?

Since no claims of effect are authorised, this question can only be answered seriously like this: the available studies ran for 8 to 12 weeks – shorter periods have hardly been examined.

Does the research also apply to women?

Hardly. The central studies were conducted on men. What has been studied for women and what has not is covered in the article Shilajit for Women.

Is fulvic acid the "active ingredient" in shilajit?

No. Fulvic acids are a natural constituent and serve as a quality and standardisation criterion – no authorised health benefit is attributed to them. Details in the article Fulvic Acid.

What dosage was used in the studies?

Mostly 250 to 500 mg daily over 8 to 12 weeks – in other words, ranges that correspond to typical intake recommendations. Higher amounts offer no proven advantage; practical guidance in the article Shilajit Dosage.

Why do other websites promise so much more?

Because promises sell. Health-related advertising claims without EU authorisation are, however, impermissible and regularly the subject of legal warnings. We have chosen the other path: reporting instead of promising.

Sources & further reading

• Pandit, S. et al. (2016): Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers. Andrologia. PubMed
• Biswas, T. K. et al. (2010): Clinical evaluation of spermatogenic activity of processed Shilajit in oligospermia. Andrologia. PubMed
• Keller, J. L. et al. (2019): The effects of Shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels. Journal of the International Society of Sports Nutrition. PubMed
• Carrasco-Gallardo, C. et al. (2012): Shilajit: a natural phytocomplex with potential procognitive activity. International Journal of Alzheimer's Disease. PubMed
• Stohs, S. J. (2014): Safety and efficacy of shilajit (mumie, moomiyo). Phytotherapy Research. PubMed

---

This article is for neutral information purposes and does not replace medical advice. Food supplements are no substitute for a balanced, varied diet and a healthy lifestyle. If you have a medical condition, take medication, are pregnant or breastfeeding, talk to your doctor or pharmacist before use.

Redaktion shilajitkaufen.com – We write to a fixed editorial standard: studies reported neutrally, no healing claims, sources under every article. More about our quality criteria: Lab Tests & Quality.