Shodhana: The Traditional Purification Method Behind Himalayan Shilajit
Shodhana is the Ayurvedic term for purifying a raw medicinal material before use. For shilajit it is described as a soak, filter and slow-evaporation sequence. It is a real tradition, not a brand invention, and it explains why raw rock exudate and finished resin are different products. What it cannot do is substitute for testing: we found no published study that measured how much it changes the metal content of shilajit, so the method is a plausible practice with an unmeasured effect.
Key takeaways
- The commonly described steps are soaking crushed raw material in water, cloth filtration to remove grit and plant matter, and slow evaporation, traditionally by sun, to a resin. Details vary by practitioner.
- Raw material can contain soil, plant debris and metals. A 2024 review reported around 65 metals in shilajit with some exceedances of limits.
- Purification is not a safety test. We found no study comparing metal levels before and after it, so only a batch laboratory report shows what a finished resin contains.
The steps
| Step | What happens | What it plausibly does | What is unmeasured |
|---|---|---|---|
| Soaking | Crushed raw resin is soaked in water | The water-soluble humic and fulvic fraction dissolves; stones and sediment settle | Which metals dissolve with it |
| Filtering | The liquid is passed through cloth | Removes grit, plant fragments and particles | Dissolved metals pass through a cloth filter |
| Evaporation | Slow drying, traditionally in the sun | Concentrates the solution back to resin without strong heat | Effect of low heat on composition vs industrial processing |
Why raw material needs it
Material scraped from rock is a mixture. A 2024 review reported around 65 metals in shilajit including lead, arsenic, cadmium and mercury, mostly below WHO and FDA limits but with a few studies reporting exceedances, and concluded that using it without knowing metal levels is not safe (Hussain 2024). Thallium has also been quantified in natural shilajit and supplements (Kamgar 2025). Humic substances can bind some metals in the laboratory, which is one reason the same material can both contain and sequester them, and the review concluded that the data on detoxification still needs clarifying. See Shilajit and Detox Claims.
What purification changes, and what it does not
- It is separation and concentration, not transformation. It does not add anything or "activate" the resin.
- It does not set a composition. Fulvic and humic content, minerals and metals still vary by source and batch. A comparison of Russian, Nepali and Iranian samples found marked differences (Kamgar 2026).
- It does not make a batch safe. Only testing for the specific batch can show that.
Lab results, batch #1093
Purified, then tested
Purification is the first step and testing is the second. Batch #1093 had heavy metals independently tested by Eurofins Food Australia, and the results are public.
Read the batch #1093 reportA lab report describes one batch. It does not show that a product treats or prevents any condition.
FAQ
What does Shodhana mean?
The Ayurvedic term for purification of a raw material before use. For shilajit it generally means soaking, filtering and slow evaporation.
Does Shodhana remove the beneficial compounds?
It is intended to remove grit and plant matter while keeping the soluble humic and fulvic fraction. Its exact effect on composition has not been measured in a study we found.
Does purification prove a product is safe?
No. Only a batch laboratory report can show metal levels.
Is industrial extraction worse?
No comparative study exists. Slower, low-heat methods are traditional and plausible, but unproven to be better.
References
- Hussain A, Saeed A. Hazardous or advantageous: uncovering the roles of heavy metals and humic substances in shilajit. Biol Trace Elem Res. 2024;202(12):5794-5814. DOI: 10.1007/s12011-024-04109-4. PMID: 38393486.
- Kamgar E, Zembrzuska J, Zembrzuski W, Kaykhaii M. Quantifying of thallium in shilajit and its supplements. BMC Chem. 2025;19(1):20. PMID: 39827344.
- Kamgar E, Gumienna M, Gorna-Szweda B, et al. From phenolic profile to gut function: comparative effects of region-specific shilajit. Molecules. 2026;31(12). PMID: 42357568.
Findings above are drawn from published abstracts; full texts were not reviewed. The process description reflects general accounts and our own product pages; we did not examine classical Sanskrit sources.