Quick answer: shilajit is a tar-like resinous substance formed over centuries from the decomposition of plant matter compressed in Himalayan, Altai and Caucasian mountain rock. Its primary bioactive compound is fulvic acid (40–80% by weight), which acts as a mineral transporter and antioxidant. Clinical evidence exists for testosterone support, mitochondrial energy enhancement (via CoQ10 potentiation), altitude adaptation and cognitive function. Most trials are small and short. It is not a stimulant and does not work acutely — effects build over 4–12 weeks. Halal status depends on sourcing and processing, not the ingredient itself.
What shilajit actually is
Shilajit (also written shilajeet, silajit, mumijo) is a phytocomplex — not a plant, mineral or animal product, but a geological substance formed from organic matter that decomposed and was compressed under mountain rock over millions of years. When temperatures rise in summer, it exudes from cracks in Himalayan, Caucasian and Altai mountain rock as a dark, viscous tar.
It has been used in Ayurvedic and Unani medicine for centuries. This traditional use gives it cultural and medical significance in South Asian communities, including British South Asian Muslim communities, for whom traditional plant and mineral medicines are part of health culture.
Primary active compounds:
- Fulvic acid (40–80%): low molecular weight organic acid that acts as a natural chelator, electron donor/acceptor (antioxidant function) and NLRP3 inflammasome inhibitor (anti-inflammatory mechanism). Fulvic acid from shilajit has significantly higher bioactivity than fulvic acid from plant compost sources.
- Humic acid: higher molecular weight, prebiotic-like effects on gut microbiome, heavy metal chelation.
- Dibenzo-α-pyrones (DBPs): mitochondrial-active compounds that protect CoQ10 from oxidation and enhance its activity in the electron transport chain.
- Minerals: up to 85 ionic minerals including iron, copper, zinc and magnesium in their fulvic acid-chelated (highly bioavailable) forms.
What the clinical evidence shows
Testosterone and male reproductive health — two RCTs
A 2015 double-blind placebo-controlled RCT in Andrologia (Pandit et al., n=96 infertile men) found purified shilajit at 200mg twice daily for 90 days significantly increased total sperm count (+37.6%), sperm motility (+12.4–17.4%) and serum testosterone (+23.5%) vs placebo.
A 2016 RCT in the Journal of Ethnopharmacology (Surapaneni et al., n=90 healthy men aged 45–55) found shilajit at 250mg twice daily for 90 days significantly increased total testosterone (by 20.45%), free testosterone (by 19.14%) and DHEA-S (by 31.0%) vs placebo, with no significant change in serum LH — suggesting a direct gonadal mechanism rather than pituitary stimulation.
Honest limit: these are two relatively small trials in specific populations. Both used purified shilajit standardised for fulvic acid content — not unprocessed rock resin or capsules with undeclared standardisation. Product quality is critical to whether trial results translate to the supplement being purchased.
Mitochondrial energy and CoQ10 potentiation — unique mechanism
Shilajit’s dibenzo-α-pyrones (DBPs) protect CoQ10 (ubiquinol) from oxidation in mitochondrial membranes, preserving its electron-carrying function in the respiratory chain. A 2009 study in the Journal of Medicinal Food (Bhattacharyya et al.) found shilajit + CoQ10 combination produced significantly greater mitochondrial complex activity than CoQ10 alone in animal models. A 2010 study found shilajit significantly increased CoQ10 plasma levels and mitochondrial biogenesis markers in muscle tissue.
This makes shilajit particularly relevant when stacked with CoQ10 — a combination increasingly used for fatigue management and age-related mitochondrial decline. Ingredient stacking (shilajit + ashwagandha) is one of the fastest-growing supplement trends in the UK in 2026, reflecting growing consumer sophistication around synergistic formulations.
Cognitive function — preclinical evidence
Fulvic acid from shilajit disaggregates tau protein filaments — the abnormal tangles associated with Alzheimer’s disease progression. A 2012 study in the Journal of Alzheimer’s Disease found fulvic acid significantly inhibited tau self-aggregation and promoted tau fibril disassembly in cell culture models. No human clinical trial has tested this specifically — evidence remains preclinical.
Altitude adaptation — traditional use with some evidence
A 2012 human trial found shilajit supplementation significantly improved haemoglobin, haematocrit and ferritin over 45 days — consistent with its iron content and fulvic acid’s enhancement of iron absorption. Relevant for athletes training or competing at altitude.
The quality and contamination problem
Raw shilajit from mountain regions contains heavy metals — lead, arsenic, mercury — from the geological environment. Unpurified or poorly purified shilajit carries real toxicity risk. A 2012 analysis found significant heavy metal contamination in commercial shilajit products not subjected to proper purification.
What to require from any shilajit product:
- Purified and standardised for fulvic acid content (minimum 50% in quality products). Products without declared fulvic acid standardisation cannot be assessed for potency.
- Third-party heavy metal testing: lead, arsenic, mercury and cadmium per batch with results available on request. Non-negotiable.
- UK GMP manufacture with batch-specific testing documentation.
- Avoid liquid resin from unverified sources — the most contaminated format on the market.
Is shilajit halal?
Shilajit is a geological/plant-origin phytocomplex with no animal-derived components. The ingredient itself is inherently halal. Compliance checks:
- Capsule shell: HPMC plant-derived capsule required — standard gelatine is typically porcine
- Processing solvents: purification should be confirmed solvent-free or fully removed with certification
- Third-party halal certification: covering ingredient source, processing and manufacturing environment
Within the Unani traditional medicine system practised in South Asian Muslim communities, shilajit (also known as mumijo or shilajeet) is a well-established remedy with precedent across Islamic medical traditions. A purified, halal-certified shilajit in HPMC capsules from a GMP manufacturer is the appropriate format for UK Muslim buyers.
Dose, timing and stacking
- Dose: 200–500mg purified extract daily, standardised for fulvic acid. The two testosterone RCTs used 400–500mg/day (200–250mg twice daily).
- Timing: with food. No evidence that specific timing affects outcomes significantly.
- Timeline: minimum 4 weeks before assessing; both RCTs measured outcomes at 90 days.
- Best stack: shilajit + ashwagandha (complementary mechanisms — shilajit direct gonadal, ashwagandha HPA axis cortisol reduction) or shilajit + CoQ10 (mitochondrial energy).
Browse the Energy and Focus UK collection and the Halal Vitamins UK collection for halal-certified adaptogens with declared doses and third-party testing.
What does shilajit do for men?
Two human RCTs show shilajit at 400–500mg/day for 90 days significantly increases total testosterone (by ~20%), free testosterone (~19%) and DHEA-S (~31%) in men. A separate RCT in infertile men found significant improvements in sperm count (+37.6%) and motility. The mitochondrial mechanism (DBP-CoQ10 potentiation) is relevant for energy and recovery. Shilajit is not a stimulant — it produces no acute energy or mood effect. Results build over 4–12 weeks of consistent daily use from a purified, standardised product.
Is shilajit safe?
Purified, properly tested shilajit from a GMP-certified manufacturer has a good safety profile in human trials — both testosterone RCTs reported no significant adverse events at 400–500mg/day for 90 days. The primary safety concern is heavy metal contamination in unpurified or poorly purified products. Always buy from brands publishing third-party batch testing for lead, arsenic, mercury and cadmium. Raw resin from unverified online sources should be avoided. Not recommended during pregnancy or breastfeeding — insufficient safety data.
Shilajit vs ashwagandha: which is better?
They work via different mechanisms and complement each other. Ashwagandha KSM-66 modulates the HPA axis, reducing cortisol by 23–27% in RCTs, and improves testosterone indirectly via stress reduction. Shilajit works via direct gonadal mechanisms and CoQ10 mitochondrial potentiation. For men with stress-driven low testosterone, ashwagandha addresses the upstream driver more directly. For men with primary testosterone decline without elevated cortisol, shilajit’s direct mechanism may be more relevant. The combination is the most-studied stack and addresses both pathways simultaneously.
Is shilajit halal?
The ingredient itself is halal — a geological/plant-origin phytocomplex with no animal components. Shilajit has precedent of use in Islamic traditional medicine (Unani). The compliance checks: HPMC plant-derived capsule shell (not standard gelatine), confirmed solvent-free purification or halal-certified processing, and third-party halal certification covering the manufacturing environment. Purchase from brands providing HPMC capsules, GMP certification and a third-party halal certificate for formal compliance.