What oxidative stress means
Oxidative stress is an imbalance between reactive oxygen molecules, sometimes called free radicals, and the body’s defences against them. It is linked to many conditions in research, which is why “antioxidant” became a marketing word. But the body’s antioxidant systems are complex, and adding antioxidants doesn’t reliably improve health outcomes.
The evidence, by type
| Evidence type | Finding | Limitation |
|---|---|---|
| Laboratory | Antioxidant activity in chemical tests | Test-tube results don’t predict effects in the body |
| Animal | Changes in antioxidant markers | Doses and controls criticised[1] |
| Human | Oxidative-stress marker changes in one trial[2] | Markers, not health outcomes |
Why early studies were criticised
A 2011 review in the Journal of Ethnopharmacology examined the pharmacological evidence for shilajit and raised concerns about the doses used and the lack of proper controls in key antioxidant studies.[1] That doesn’t mean the findings are wrong, but it does mean they can’t carry much weight on their own.
What it means for you
“Rich in antioxidants” is a description of laboratory chemistry, not a proven health effect, and UK rules restrict health claims; see claims rules. How antioxidant claims fit the wider mechanism picture is on shilajit science, and inflammation research on inflammation, joints and pain.
How antioxidant activity is measured in a lab
Laboratory antioxidant tests measure how well a sample neutralises reactive molecules in a test tube. Common assays include DPPH and ORAC tests, which give a number for “antioxidant capacity”. These tests are useful for comparing materials chemically, but they happen outside the body. They don’t account for absorption, metabolism or the body’s own antioxidant systems, which is why a high laboratory score doesn’t translate directly into a health effect.
Oxidative-stress markers in people
In human studies, researchers measure blood or urine markers associated with oxidative stress or antioxidant defences. A change in a marker shows that something happened biologically. It doesn’t show that the person is healthier, unless an outcome such as bone density, symptoms or disease risk is also measured and improved. In the bone-density trial of shilajit in postmenopausal women, bone outcomes were the primary focus, with oxidative-stress markers reported alongside them.[2] See bone health.
Reading antioxidant claims
| Claim | Usually based on | What it proves |
|---|---|---|
| “Powerful antioxidant” | Laboratory assays | Chemical activity in a test tube |
| “Fights free radicals” | Lab and animal studies | Not a demonstrated effect in people |
| “Reduces oxidative stress” | Marker changes in one trial[2] | A biomarker change, not a health outcome |
| “Slows ageing” | Extrapolation | Not established; see ageing |
Frequently asked questions
Is shilajit an antioxidant?
It shows antioxidant activity in laboratory and animal studies. A proven antioxidant health benefit in people hasn’t been established.
Does shilajit reduce oxidative stress?
One human trial reported changes in oxidative-stress markers.[2] Markers aren’t the same as health outcomes.
Why don’t lab antioxidant results apply to people?
Absorption, metabolism and the body’s own antioxidant systems change what happens. Test-tube activity often doesn’t translate.
Is shilajit a better antioxidant than fruit or vegetables?
There is no study comparing them.
Can sellers say shilajit is an antioxidant?
Health claims in UK marketing must be authorised. See what sellers can claim.
Where can I read the human evidence?
See evidence by topic.
What is an ORAC score?
A laboratory measure of antioxidant capacity in a test tube. It doesn’t show how a substance behaves in the body.
Should I take shilajit as an antioxidant?
There is no proven antioxidant health benefit of shilajit in people. A varied diet remains the established source of dietary antioxidants.
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.
- Wilson E, Rajamanickam GV, Dubey GP, et al.. Review on shilajit used in traditional Indian medicine. Journal of Ethnopharmacology 136(1):1–9, 2011. doi:10.1016/j.jep.2011.04.033; PMID 21530631. View source (opens in a new tab) [Review]
- 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]