Raw vs purified shilajit: which is safer?

Raw shilajit is sold on the appeal of being natural and untouched. Purified shilajit is what scientists actually tested. When you put the two side by side, purified comes out ahead on evidence, but not because purification magically makes a product safe. It’s because purified products are the only ones with trial data, and because they’re easier to standardise and test.

The deciding factor for safety is the same for both: a lab result for the batch you’re buying. A well-tested raw product could be cleaner than a poorly made purified one. Without a certificate, you can’t tell either way.

What’s the difference between raw and purified shilajit?

Raw shilajit is the material as collected from rock, perhaps cleaned by hand and dried. A 2003 paper described crude shilajit as a dark, gummy mass mixed with plant fibres, sand and earthy matter, and noted earlier reports that native shilajit can be contaminated with polymeric quinones, microbial debris and heavy metals (Sharma et al., 2003).

Purified shilajit has been dissolved, filtered and concentrated to remove the insoluble material. The word “purified” has no legal definition that we could find, so it can describe anything from a simple traditional process to an industrial extract standardised to set levels of marker compounds.

How is shilajit purified?

The traditional method and modern extraction work on the same principle: shilajit’s useful fraction dissolves in water, while sand and debris don’t.

The same 2003 paper set out a traditional Ayurvedic method, called agnitapi, in four steps (Sharma et al., 2003):

1. Soak the shilajit in water to make a solution.
2. Filter it to remove impurities and particles.
3. Boil the clear filtrate until it becomes a thick, viscous liquid.
4. Dry the result in an incubator.

Modern products use similar water-based extraction, then standardise the result. The resin in one recent trial was made by solvent-free water extraction and standardised to at least 60% fulvic acids (Yadav et al., 2026). The extract in a strength trial was standardised to at least 50% fulvic acid and 10% dibenzo-alpha-pyrones (Keller et al., 2019). The bone trial used a “standardized aqueous extract” (Pingali and Nutalapati, 2022). Researchers have also developed lab methods to compare raw material, extract and resin by their marker compounds and minerals (Kohli et al., 2026).

Which form did the human studies use?

Purified or processed shilajit, in every trial we checked that describes the product.

We found no trial of raw shilajit. Even the one resin study used a processed, standardised resin. So any benefit you read about on this site, or anywhere else, comes from purified products, and doesn’t automatically apply to raw ones. The “on hold” health claims that Great Britain still lists for shilajit are also for “Asphaltum/Shilajit - purified”; see is shilajit legal in the UK?.

Does purification remove heavy metals?

Not reliably, as far as the evidence goes. Filtering clearly removes sand and grit. But a 2026 analysis of 12 samples found that most metals in shilajit were associated with small complexes in the size range of humic acid and metal complexes (Kamgar et al., 2026), which suggests they may travel with the soluble part that purification keeps. That’s our inference, not a tested result. We found no study that measured heavy metals in the same batch before and after purification.

What studies do show is that commercial products aren’t automatically cleaner than crude shilajit:

• Thallium. In one analysis, crude shilajit contained up to 0.226 micrograms of thallium per gram, while supplements contained up to 0.5 micrograms per gram, and some supplements had more than the crude samples (Kamgar et al., 2025).
• Salts. In 14 raw samples and 6 supplements, raw shilajit contained up to 9.5 mg of chloride and 12.4 mg of sulphate per gram, against at most 0.93 mg and 0.85 mg per gram in the supplements (Kamgar et al., 2025). Processing and formulation clearly change composition, though not always in the same direction for every substance.
• Toxic metals. Shilajit from India and Pakistan contained lead, arsenic and mercury above permissible limits in one analysis (Aldakheel et al., 2022). Region, collection and handling all seem to matter.

The practical lesson is the same whichever form you choose: ask for a certificate of analysis for your batch and check the heavy metal figures yourself. Our guide to reading a certificate of analysis explains how, and shilajit and heavy metals covers the health side.

Is raw shilajit more natural or more potent?

There’s no evidence that raw shilajit works better. “Natural” doesn’t mean safer, and nobody has compared raw and purified shilajit in people. Because raw shilajit still contains insoluble material, a weighed dose of raw resin may contain less of the soluble fraction that was studied, which makes it harder to match the doses used in trials.

Don’t confuse “resin” with “raw”. Resin is a form; raw is a level of processing. Purified shilajit is often sold as resin, and the only resin trial used a purified product. See resin vs capsules.

What should I check when choosing?

1. Choose purified, and look for a description of how it was purified.
2. Look for standardisation, such as a stated fulvic acid percentage with the test method named.
3. Ask for a batch certificate with numbers for lead, cadmium, mercury and arsenic, plus microbial tests. Raw shilajit comes from rock and soil, so microbial results matter even more.
4. Ignore home tests. Burning or dissolving a sample can’t detect metals or microbes. See fake shilajit.

For the full checklist, see the buying guide.