- Origin: different plants, microbes and rock.[1]
- Processing: extraction and drying change the final material.
- Method: lab procedures give different figures.
- Variation is normal; batch testing manages it.
The three sources of variation
| Source | What changes | In depth |
|---|---|---|
| Origin | Organic content and element profile | Origin and composition |
| Processing | What stays in the resin, moisture, microbial load | Processing and composition |
| Test method | The reported figures themselves | Laboratory methods |
| Sampling | Differences between samples of the same material | Variation between samples |
Evidence that composition varies
Reviews describe shilajit as a complex, variable mixture of humic substances and metabolites shaped by its natural habitat.[1] A 2019 review listed variability among the main gaps in understanding of shilajit.[2] Contaminants vary too: a 2025 study found thallium at different levels across natural samples and commercial supplements.[3]
What variation means for research and buyers
- Research doesn’t transfer automaticallyA trial result applies to the preparation tested; see preparation and research.
- Batch reports matterEach batch needs its own testing; see why the batch matters.
- Compare like with likeOnly compare figures from the same method.
Why two genuine resins can test differently
Two brands both sell genuine purified resin. Brand X’s material comes from one region and is dried to a firm paste; Brand Y’s comes from another region and is a softer, wetter resin. Brand X reports a higher fulvic acid percentage, using a method that tends to give higher figures, and a slightly higher iron level from its source rock. Brand Y reports lower figures across the board, partly because extra moisture dilutes every per-gram result. Neither is “fake” and neither is necessarily better. The differences come from origin, processing and method.
How brands manage variation
| Approach | What it achieves |
|---|---|
| Consistent sourcing | Fewer differences in raw material |
| Controlled processing | Similar moisture and clarity between batches |
| Batch testing | Each batch’s actual results are known |
| Standardisation | Selected components held within a range |
What variation means for evidence ratings
Because composition varies, a human trial result describes the preparation used in that trial. That’s why every topic on our evidence by topic page carries the caveat that most trials used one branded extract, and why we keep evidence about shilajit in general separate from evidence about any particular product; see our evidence rating system.
Questions to ask when results differ
- Same method?Different methods give different figures; see fulvic acid testing.
- Same basis?Per gram as sold, per serving or dry weight.
- Same stage?Raw material or finished batch.
- Within uncertainty?Small differences may not be meaningful; see sample variation.
Frequently asked questions
Why does shilajit differ between brands?
Because origin, processing and testing methods differ. Two genuine products can have different lab results.
Is variation a sign of fake shilajit?
No. Natural variation is expected. Identity and contaminant testing are what reveal problems.
Why do two labs give different fulvic acid figures?
Because they use different procedures. Fulvic acid is defined by method; see fulvic acid testing.
Do batches from the same brand vary?
They can, which is why each batch should have its own laboratory report.
Does variation affect safety?
It can, because metal levels depend on the source rock. Batch testing for metals is essential.[3]
How should I compare products?
On batch-specific reports using the same tests, plus cost per serving. See how to choose shilajit.
Can a brand make every batch identical?
Not exactly, because the raw material is natural. Consistent sourcing, controlled processing, batch testing and standardisation reduce the differences.
How do I compare two brands’ lab results fairly?
Check that the method, reporting basis and testing stage match, and that differences exceed measurement uncertainty.
Sources & further reading
Primary research, regulators and standards bodies are cited first. A source being listed here does not mean it supports every claim made by sellers; it supports the specific statement it is attached to.
- Agarwal SP, et al.. Shilajit: a review. Phytotherapy Research 21(5):401–405, 2007. doi:10.1002/ptr.2100; PMID 17295385. View source (opens in a new tab) [Review]
- Shilajit (Mumie): current status of biochemical, therapeutic and clinical advances. Current Nutrition & Food Science 15(2), 2019. doi:10.2174/1573401313666170823160217. View source (opens in a new tab) [Review]
- Quantifying of thallium in Shilajit and its supplements to unveil the potential risk of consumption of this popular traditional medicine. BMC Chemistry 19:20, 2025. doi:10.1186/s13065-025-01384-7. View source (opens in a new tab) [Laboratory analysis]