The mismatch between use and evidence
Shilajit is usually taken daily, often for long periods. The published human trials ran from 8 weeks to 48 weeks,[3][1] and the main animal safety study ran for 91 days.[4] That leaves a gap between how people use shilajit and what the research covers. A 2019 review highlighted gaps in shilajit research more generally,[5] and long-term safety is one of the most practical of them; see evidence gaps.
What only time can reveal
| Risk | Why time matters |
|---|---|
| Metal accumulation | Cadmium and lead build up over years |
| Slow organ effects | Kidney or liver changes may develop gradually |
| Interactions as health changes | New conditions and medicines appear over time |
| Rare reactions | More users over more time means more chance to see them |
Cumulative metal exposure
Cadmium in particular is cleared from the body very slowly, which is why long-term exposure is the concern.[2] A small daily intake that seems negligible becomes more significant over years. GB law caps cadmium in supplements at 1.0 mg/kg,[2] but long-term users have most to gain from products well below that limit; see cadmium and heavy metals.
People who weren’t studied
Long-term users often include older adults, who weren’t specifically studied, and people whose health and medicines change over the years. A product that suited you at 40 may need reconsidering at 60 if you develop kidney problems or start new medicines; see older adults and existing conditions.
Managing the evidence gap
- Choose products well below the limitsNot just under them.
- Check every new batchLong-term users buy many jars.
- Stay within the label servingExposure rises with dose.
- Consider breaksThey reduce cumulative exposure.
- Review yearlyIs it still worthwhile? Has your health changed?
What good long-term research would look like
Useful long-term evidence would follow larger groups of users for several years, with periodic blood tests for kidney and liver function and blood metal levels, including older adults and people on common medicines. Real-world reporting systems would add information on rare effects. Until then, caution about very long-term use is reasonable, not alarmist.
Keeping it in proportion
The absence of long-term data isn’t evidence of long-term harm. Shilajit was reported as well tolerated in trials up to 48 weeks,[1] and it has a long traditional history. The point is that the most common way people use it, daily for years, hasn’t been formally studied, so sensible precautions make sense; see taking shilajit long term.
How people actually use shilajit
Most users take a daily serving, often in a morning drink, and many continue for months or years as part of a routine. Some take breaks; others never do. Few studies reflect these patterns. That is why long-term users in particular benefit from treating each new jar as a new batch to check, and from setting regular review points; see why the batch matters.
Simple monitoring for long-term users
If you take shilajit long term, mention it whenever you have routine blood tests, so your GP can interpret results with that in mind. If you have kidney problems or other conditions, ask whether any specific monitoring makes sense. Note any gradual changes in how you feel.
Help improve the evidence
Reporting suspected reactions, even minor ones, through the MHRA Yellow Card scheme or to the Food Standards Agency helps build the real-world picture that formal studies lack.[6]
Putting it into practice
If you have taken shilajit for a long time, take stock: check the latest batch report for your product, confirm you are within the label serving, and consider a break. Mention your long-term use to your GP, particularly if your health or medicines have changed since you started.
Why this matters for older users
People who start shilajit in middle age may still be taking it decades later, when kidney function, medicines and health needs have changed. Long-term data would be most valuable for exactly this group, which is why regular reviews matter more with age. A yearly check-in with yourself, and with your GP where relevant, is a simple safeguard.
The bottom line
Most shilajit users take it for far longer than any study has lasted. That gap matters most for cumulative metal exposure and for people whose health changes over time. Choose well-tested products, check each batch, stay within the label serving and review your use regularly.
Frequently asked questions
Why do long-term safety studies matter for shilajit?
Because people often take it daily for years, while studies last at most 48 weeks.[1]
What is the main long-term risk?
Cumulative exposure to metals such as cadmium and lead.
Is long-term shilajit use harmful?
There is no evidence of long-term harm, but long-term use hasn’t been formally studied.
How long has shilajit been studied in people?
Up to 48 weeks.[1]
Should I take breaks from shilajit?
Breaks aren’t proven to help effects, but they reduce cumulative contaminant exposure.
Why check every new batch?
Contaminant levels can change between batches.
Do I need blood tests if I take shilajit long term?
Mention it to your GP, who can decide whether any tests are appropriate.
What would better evidence look like?
Larger, multi-year studies with blood monitoring, including older adults.
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.
- Pingali U, Nutalapati C. Shilajit extract reduces oxidative stress, inflammation, and bone loss to dose-dependently preserve bone mineral density in postmenopausal women with osteopenia: a randomized, double-blind, placebo-controlled trial. Phytomedicine 105:154334, 2022. doi:10.1016/j.phymed.2022.154334; PMID 35933897. View source (opens in a new tab) [Randomised controlled trial]
- European Commission (UK version on legislation.gov.uk). Commission Regulation (EC) No 629/2008 amending Regulation (EC) No 1881/2006 setting maximum levels for certain contaminants in foodstuffs. legislation.gov.uk, 2008. View source (opens in a new tab) [UK legislation (retained)]
- Keller JL, Housh TJ, Hill EC, Smith CM, Schmidt RJ, Johnson GO. The effects of Shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels. Journal of the International Society of Sports Nutrition 16:3, 2019. doi:10.1186/s12970-019-0270-2; PMID 30728074. View source (opens in a new tab) [Randomised controlled trial]
- Asian Pacific Journal of Tropical Biomedicine authors. Evaluation of safety profile of black shilajit after 91 days repeated administration in rats. Asian Pacific Journal of Tropical Biomedicine, 2012. View source (opens in a new tab) [Animal safety study]
- 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]
- Food Standards Agency. How to report a food safety or hygiene issue for members of the public. GOV.UK, 2026. View source (opens in a new tab) [Regulator guidance]