- Water extraction keeps the soluble fraction and removes humin.
- Moisture content changes concentrations per gram.
- Standardised extracts are adjusted to fixed levels.
- Dissolved metals can become concentrated as water is removed.[1]
What each processing step changes
| Step | Effect |
|---|---|
| Water extraction | Keeps fulvic acid and soluble minerals; removes insoluble humin and debris |
| Filtration cycles | Removes finer particles |
| Drying | Sets moisture, which shifts every per-gram figure |
| Standardisation | Adjusts selected components to a target |
| Powdering | May add carriers, lowering shilajit per gram |
The concentration effect
Removing water concentrates whatever stayed dissolved, including metals bound to the soluble fraction. That’s one plausible reason a 2025 study found some supplements with more thallium than crude samples.[1] It’s also why contaminant testing must be done on the finished product, not only the raw material; see how purification affects testing.
Reading lab results with processing in mind
- Raw or finished?Results should be for the finished batch.
- Moisture stated?Helps compare per-gram figures.
- Carriers declared?Powders may contain less shilajit per gram.
Process details are in water-based extraction and does drying change shilajit?
Processing choices and their trade-offs
| Choice | Benefit | Trade-off |
|---|---|---|
| More extraction cycles | Cleaner resin, better recovery | More time and cost |
| Finer filtration | Fewer fine particles | Slower processing |
| Controlled drying | Better hygiene and consistency | Equipment cost |
| Standardisation | Consistent selected components | A more processed material |
Worked example: how moisture shifts per-gram figures
Take one extract and dry half of it to 10% moisture and half to 20% moisture. The 10% resin is 90% solids; the 20% resin is 80% solids. Every component in the wetter resin is therefore diluted to 80 ÷ 90, or about 89%, of its level in the drier resin. A fulvic acid figure of 50% in the dry resin would read about 44% in the wet one, and a lead figure of 1.0 mg/kg would read about 0.89 mg/kg. Same extract, different numbers, purely because of drying.
What good processing documentation looks like
- Method describedExtraction, filtration and drying named.
- Finished-product testingThe report is for the finished batch.
- Moisture or basis statedSo per-gram figures can be compared.
- Additives declaredAny carrier in powders listed on the label.
Raw material vs finished product testing
| Testing point | Useful for | Limitation |
|---|---|---|
| Raw material | Screening suppliers and sources | Processing changes concentrations |
| Finished batch | What you actually consume | Covers that batch only |
A report on raw material can’t tell you what the finished resin contains, because extraction and drying change concentrations.[1] Always ask which stage a report covers; see how purification affects testing.
Frequently asked questions
Does processing reduce fulvic acid?
Water extraction keeps fulvic acid, because it is water-soluble. Drying changes concentration per gram rather than removing it.
Why does processed shilajit sometimes have more metals?
Removing water concentrates dissolved substances, including some metals, which is why the finished batch must be tested.[1]
Is minimally processed shilajit closer to nature?
It may be, but it also keeps more debris and microbes. Natural isn’t automatically better.
Does powdering change shilajit?
Powders can include carriers, which lower the amount of shilajit per gram.
What is standardisation?
Processing an extract to fixed levels of selected components; see standardised extracts.
How do I know how a product was processed?
Ask the brand for its extraction and drying method and the finished-batch COA.
Why do two resins from the same source test differently?
Processing differences, especially drying and moisture, change every per-gram figure even when the extract is the same.
Is a raw-material COA good enough?
It helps a brand screen suppliers, but buyers need the finished-batch report, because processing changes concentrations.
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.
- 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]