Explore Supplements Subscribe
The VerdictLOW CONVICTION

The testosterone story is one industry-funded study from 2016, never repeated by anyone else in eight years.

Ask yourself one question. Are you pregnant, planning pregnancy, on a blood-pressure medication, or buying raw resin from a marketplace? If yes to any of those, skip shilajit entirely. If no, you still do not need it — the energy and longevity claims have zero RCT support, and the testosterone claim is one study from 2016 the manufacturer never repeated.

Shilajit is a Himalayan rock-tar people grind into a powder, push into a capsule, and sell as a testosterone or energy supplement. Almost every positive trial uses one specific manufacturer's purified extract called PrimaVie, and the raw resin most people buy on Amazon is a different product with documented lead, arsenic, and mercury in lab analyses. Reading the trial evidence and buying the cheaper resin is like reading a clinical trial of a prescription drug and assuming the unregulated street version of the same chemical works the same way.

That's the general answer. Your stack is different.

Check your whole stack
SH
Dr. Seth Holbrook, DPT — Doctor of Physical Therapy • Coach to 300+ clients
I built The Verdict to cut through recycled health advice and show what the evidence actually supports.

Herbal · Adaptogen · Mineral-pitch resin

Shilajit

The Himalayan resin sold as a natural testosterone booster. One trial, eight years of silence, and lab-documented heavy metals in the raw resin most people actually buy.

Skip · Conditional Yes in three narrow contexts

Ask yourself one question. Are you pregnant, planning pregnancy, on a blood-pressure medication, or buying raw resin from a marketplace? If yes to any of those, skip shilajit entirely. If no, you still do not need it.

The energy and longevity claims have zero RCT support. The testosterone claim is one study from 2016 the manufacturer never repeated. The raw resin on Amazon has documented lead, arsenic, and mercury contamination in lab testing.

Takes less than 30 seconds. No equipment needed.

The Verdict

The testosterone story is one industry-funded study from 2016, never repeated by anyone else in eight years.

What it is Shilajit is a tar-like resin that oozes out of cracks in Himalayan, Hindukush, Caucasus, Altai, and Andean rocks during warm months. It is a multi-component mix of humic substances (fulvic acid is the most-marketed fraction), dibenzo-alpha-pyrones, plant and microbial breakdown products, and a mineral fraction that includes a variable contamination load of lead, arsenic, and mercury. People take it as a "natural testosterone booster," a mitochondrial energy supplement, and an Ayurvedic rejuvenator.

Almost every positive shilajit trial uses one specific manufacturer's purified extract called PrimaVie, made by Natreon Inc. The raw resin most people buy on Amazon or in health-food shops is a different product with documented lead, arsenic, and mercury in lab analyses. Reading the trial evidence and buying the cheaper resin is like reading a clinical trial of a prescription drug and assuming the unregulated street version of the same chemical works the same way.

  1. The verdictThe whole modern testosterone reputation rests on one trial of 75 men aged 45-55 that the manufacturer ran on its own PrimaVie product in 2016. Nobody outside the manufacturer has repeated that result in the eight years since.
  2. What most people get wrongPeople assume "shilajit is shilajit." It is not. The trials tested PrimaVie standardised extract with quality-controlled heavy-metal limits; the raw resin sold online has documented lead, arsenic, and mercury contamination. The price savings on raw resin are on the wrong axis.
  3. The protocol in plain EnglishFor most people: skip. The £25-45 per month is better spent on creatine, vitamin D if you are deficient, magnesium, omega-3, or protein. If you are testing the 2016 testosterone claim, use PrimaVie only at 500 mg per day for 90 days with a blood test before and after, and stop if testosterone has not actually gone up.

Best for

Postmenopausal women with osteopenia as a clinician-supervised adjunct after first-line treatment is in place. Men with low sperm counts under urology supervision. Healthy men 45-55 self-experimenting with the 2016 testosterone claim using PrimaVie and a stopping rule.

Skip if

You are pregnant or planning pregnancy. You are on blood-pressure medication, a potassium-sparing diuretic, or have high blood pressure or low potassium. You are buying raw resin online. You are under 45, healthy, and buying for energy, cognition, mitochondria, fat loss, endurance, or longevity.

The protocol, safety, and full evidence below

The Protocol

Shilajit protocol overview

Every positive human RCT uses PrimaVie standardised extract from Natreon Inc. at 250-1000 mg per day. The dosing table below covers every population studied. If you are taking shilajit outside one of these contexts, you are taking it without evidence.

PopulationDoseDurationFormEvidence
General healthy adult (retail) NOT INDICATED — — No consumer claim clears MODERATE-recommend
Postmenopausal w/ osteopenia (clinician adjunct, after first-line SoC) 250-500 mg/day 48 weeks PrimaVie standardised extract Pohrt 2022 PMID 35933897 (single trial)
Oligospermic infertile men (urology-supervised adjunct) 100 mg twice daily (200 mg/day) 90 days Processed shilajit capsule Biswas 2010 PMID 20078516 (open-label N=35)
Eugonadal men 45-55y (self-experiment, stopping rule) 250 mg twice daily (500 mg/day) with meals 90 days + baseline & day-90 LC-MS/MS T panel PrimaVie standardised extract Pandit 2016 PMID 26395129 (Natreon-funded N=75)
Recreationally-active men (fatigue-induced strength decline) 500 mg/day 8 weeks PrimaVie standardised extract Keller 2019 PMID 30728074 (Natreon-funded N=63)
Healthy adults seeking energy / cognition / mitochondrial / adaptogen / fat loss / hypertrophy / endurance / longevity / cortisol NOT INDICATED — — Zero RCT support in any population
Pregnancy and lactation HARD CONTRAINDICATION — — Velmurugan 2018 pseudohyperaldosteronism case + heavy-metal teratogenic concern
Adults on antihypertensives / K-sparing diuretics / MR antagonists / with HTN or hypokalemia HARD CONTRAINDICATION — — 11β-HSD2 / mineralocorticoid pathway interaction
Anyone buying raw resin or non-PrimaVie products HARD NEGATIVE RECOMMENDATION — — Heavy-metal contamination floor + form-substitution-not-validated
Children and adolescents NOT INDICATED — — No pediatric data; class-level heavy-metal concern

Forms — pick PrimaVie or nothing

PrimaVie® standardised extract
Natreon Inc. · QC heavy-metal floor
The ONLY form with positive RCT evidence. Standardised fulvic acid + DBP content. Used in every major Western trial.
£25-45/month at 500 mg/d
Generic / private-label capsule
No standardisation · variable QC
No clinical evidence in matched form. Source-dependent fulvic acid content. Unknown heavy-metal floor.
£10-25/month
Premium raw resin (Pürblack, Lava Vitae, etc.)
Brand-specific processing · rarely audited
No head-to-head outcome RCT vs PrimaVie. Brand QC claims unverified.
£40-100/month
Raw Amazon / eBay resin
Documented heavy-metal contamination
Actively contraindicated. Khalid 2022 + Hadi 2024 lab analyses detected lead, arsenic, mercury.
£8-30/month
Liquid drops / "liposomal" / "nano"
No human PK data
"Enhanced bioavailability" claim has zero supporting human pharmacokinetic data.
£30-60/month
Fulvic acid concentrate (isolated)
Subfraction, not whole extract
Different intervention from PrimaVie whole-extract. Lacks the DBP + mineral matrix the trials measured.
£15-40/month

Practical instructions

  • Take with meals. The PrimaVie trials dosed after meals.
  • If you must use it, use PrimaVie standardised extract — not generic capsules, not raw resin, not drops.
  • Separate by 2-4 hours from tetracyclines, quinolones, levothyroxine, and bisphosphonates. The mineral fraction can chelate them and reduce drug absorption.
  • Set a baseline blood test before you start and a 90-day follow-up. If your target outcome has not moved, stop.
  • There is zero published half-life, AUC, or bioequivalence data for any shilajit preparation in humans. The "twice daily" timing in Pandit 2016 is the only PK anchor that exists.

Safety & Interactions

Shilajit safety profile

Two distinct safety signals matter: a documented case of pseudohyperaldosteronism in pregnancy via the same mechanism that makes licorice dangerous, and a documented heavy-metal contamination floor in retail raw resin. Neither is hypothetical.

Drug Interactions

11β-HSD2 substrates / mineralocorticoid pathway Severe

Documented mumijo-induced pseudohyperaldosteronism (licorice-like syndrome) — hypertension, hypokalemia, suppressed renin/aldosterone via 11β-HSD2 inhibition (Velmurugan 2018 case report). HARD CONTRAINDICATION in pregnancy.

Antihypertensives (ACEi, ARB, beta-blockers, diuretics, CCBs) Moderate

Theoretical additive blood-pressure effect via mineralocorticoid pathway. AVOID; if used, monitor BP every 2-4 weeks.

Potassium-sparing diuretics + MR antagonists (spironolactone, eplerenone, amiloride, triamterene, finerenone) Moderate

Direct 11β-HSD2 / mineralocorticoid pathway interaction. AVOID.

Tetracyclines, quinolones, levothyroxine, bisphosphonates Moderate

Divalent-cation chelation by the mineral fraction reduces drug absorption. Separate dosing by 2-4 hours, or avoid during course.

Warfarin, DOACs, chronic antiplatelets Theoretical

Theoretical herbal-anticoagulant interaction. No clinical-event data published. Conservative avoid; if used, document and monitor.

Oral iron + iron-overload disorders Mild-Moderate

Variable iron content in shilajit (Khalid 2022 analytical study). Avoid in hemochromatosis, polycythemia, iron-replete adults.

Cyclosporine, tacrolimus, immunosuppressants, lithium Mild-Moderate

Theoretical herbal-immunosuppressant or mineral-handling interaction. Specialist-supervised; avoid without consult.

Contraindicated Populations

Upper Intake Level (UL) NOT ESTABLISHED in any international regulatory framework (FDA, EFSA, IOM, WHO). The PrimaVie program tested up to 1000 mg/day (Tinsley 2024) without a published safety signal at that dose over 8 weeks. The UL for raw resin is impossible to define — there is no "safe high dose" of an uncharacterised resin with variable heavy-metal content.

Stop immediately if

  • New hypertension or worsening of existing hypertension
  • Hypokalemia, oedema, fluid retention
  • Blood-pressure medication needs upward titration
  • Dyspnoea, palpitations, or muscle weakness suggestive of hypokalemia
  • New hepatobiliary symptoms (RUQ pain, jaundice, dark urine)
  • Neurological symptoms suggestive of heavy-metal exposure
  • You confirm the product purchased is not the PrimaVie standardised extract that was tested
LOW · Endpoint-stratified

Single-trial-per-claim across the entire PrimaVie program with no independent replication in eight years. BMD postmenopausal-osteopenia is the strongest single positive (MODERATE single-trial). Collagen-synthesis biomarkers MODERATE but biomarker-only. Everything else LOW, NONE, or DEBUNKED-by-absence.

What would change this verdict?

Three trials would shift the conviction tiers: (1) Independent, non-Natreon, double-blind, placebo-controlled RCT of N≥150 healthy eugonadal men aged 25-65 using PrimaVie 500 mg/d × 12 weeks with LC-MS/MS total + free T endpoints, showing greater than 12% absolute total T increase, would upgrade eugonadal testosterone from LOW to MODERATE. (2) Independent N≥200 postmenopausal-osteopenia trial replicating Pohrt 2022 over 24 months with a head-to-head arm against a bisphosphonate or denosumab would upgrade BMD from MODERATE to HIGH. (3) A functional connective-tissue outcome trial (tendon stiffness by shear-wave elastography or skin elasticity by cutometry) replicating the Tinsley 2024 biomarker signal would upgrade the collagen pathway from MODERATE-biomarker-only to MODERATE-clinical. Until at least the first one lands, the rational position is the current one.

Worth Your Money?

Weekly cost£6-11 per week — one bottle of PrimaVie standardised extract at 500 mg/day. Raw resin is cheaper but a different product with documented heavy-metal contamination, so the savings are on the wrong axis.
Worth it ifYou are postmenopausal with osteopenia and your clinician has optimised first-line treatment (calcium + vitamin D, resistance + impact training, bisphosphonate or denosumab if indicated) and wants a single-trial-LOW adjunct. OR you are a healthy man 45-55 and you want to run the Pandit 2016 self-experiment with PrimaVie and a baseline + day-90 testosterone panel — and you understand this is a personal experiment, not a protocol.
Lower priority ifYour sleep is inconsistent, your protein intake is sub-1g per pound of lean mass, you have significant excess body fat, you are not training consistently, or you have not yet established adequate vitamin D, magnesium, omega-3, and creatine. Every one of those moves the needle on testosterone, body composition, and energy more than shilajit — and the evidence is multiple-RCT high-evidence, not single-Natreon-funded.
Skip for the general consumer Conditional Yes — three narrow specialist-supervised contexts only

Go Deeper

Want to stop wasting money on supplements built on one industry-funded trial? The Verdict reviews one supplement every week — free, with the evidence stack laid out the way it actually is.

Subscribe to The Verdict

Sources

  1. Pandit S, Biswas S, Jana U, De RK, Mukhopadhyay SC, Biswas TK. (2016). Clinical evaluation of purified Shilajit on testosterone levels in healthy volunteers. Andrologia. PMID 26395129. RCT N=75 healthy men 45-55y, PrimaVie 250 mg BID × 90d. Significant increases in total T, free T, DHEAS (p<0.05); LH/FSH maintained. Natreon-funded.
  2. Pohrt RA, et al. (2022). Shilajit extract reduces oxidative stress, inflammation, and bone loss to dose-dependently preserve bone mineral density in postmenopausal women with osteopenia. Phytomedicine. PMID 35933897. RCT N=60 postmenopausal women w/ osteopenia, 250 vs 500 mg/d × 48 weeks. Dose-dependent BMD preservation. Longest shilajit RCT to date.
  3. Keller JL, et al. (2019). The effects of Shilajit supplementation on fatigue-induced decreases in muscular strength and serum hydroxyproline levels. J Int Soc Sports Nutr. PMID 30728074. RCT N=63 recreationally-active men, PrimaVie 250 vs 500 mg/d × 8 wk. Reduced fatigue-induced MVIC decline; increased serum hydroxyproline. Natreon-funded.
  4. Tinsley GM, et al. (2024). Effects of 8 Weeks of Shilajit Supplementation on Serum Pro-c1α1, a Biomarker of Type 1 Collagen Synthesis. J Diet Suppl. PMID 36546868. RCT N=35 recreationally-active, PrimaVie 500 vs 1000 mg/d × 8 wk. Pro-c1α1 increased. Natreon-funded.
  5. Das A, et al. (2016). The Human Skeletal Muscle Transcriptome in Response to Oral Shilajit Supplementation. J Med Food. PMID 27414521. Clinical trial NCT02026414, PrimaVie 500 mg/d × 8 wk + 4 wk exercise in overweight/class I obese US adults. ECM-related gene upregulation in skeletal muscle. Natreon-funded.
  6. Das A, et al. (2019). Skin Transcriptome of Middle-Aged Women Supplemented With Natural Herbo-mineral Shilajit Shows Induction of Microvascular and Extracellular Matrix Mechanisms. J Am Coll Nutr. PMID 31161927. RCT NCT02762032, PrimaVie in healthy middle-aged women × 14 wk. Skin transcriptome induction of microvascular + ECM genes. Natreon-funded.
  7. Biswas TK, et al. (2010). Clinical evaluation of spermatogenic activity of processed Shilajit in oligospermia. Andrologia. PMID 20078516. Open-label single-arm before-after N=35, processed shilajit 100 mg BID × 90 days. Improved semenogram + serum T; decreased semen MDA. No placebo arm.
  8. Ahangar P, et al. (2020). Efficacy of Momiai in Tibia Fracture Repair: A Randomized Double-Blinded Placebo-Controlled Clinical Trial. J Altern Complement Med. PMID 32310691. RCT, Iranian momiai source (non-PrimaVie), adult tibia fracture.
  9. Kerksick CM, et al. (2025). Effects of 12 Weeks of Chromium, Phyllanthus emblica Fruit Extract, and Shilajit Supplementation on Markers of Cardiometabolic Health, Fitness, and Weight Loss in Men and Women with Risk Factors to Metabolic Syndrome. Nutrients. PMID 40573153. Combination design — shilajit attribution NOT ISOLABLE.
  10. Stephen JM, et al. (2024). Do "testosterone boosters" really increase serum total testosterone? A systematic review. Int J Impot Res. PMID 37697053. Documents lax industry regulation and unverified efficacy claims pattern across the T-booster category.
  11. Velmurugan S, et al. (2018). Pseudohyperaldosteronism due to mumijo consumption during pregnancy: a licorice-like syndrome. Gynecological Endocrinology. PMID 29933704. Case report. Mumijo-induced 11β-HSD2 inhibition.
  12. Khalid M, et al. (2022). Rapid Determination and Quantification of Nutritional and Poisonous Metals in Vastly Consumed Ayurvedic Herbal Medicine (Rejuvenator Shilajit) by Humans Using Three Advanced Analytical Techniques. Biological Trace Element Research. PMID 34800280. Heavy-metal contamination in retail shilajit samples (LIBS + ICP + EDX).
  13. Hadi MM, et al. (2024). Hazardous or Advantageous: Uncovering the Roles of Heavy Metals and Humic Substances in Shilajit. Biological Trace Element Research. PMID 38393486. Comprehensive review of heavy-metal profile and detoxification mechanisms.
  14. Carrasco-Gallardo C, Guzmán L, Maccioni RB. (2014). Safety and efficacy of shilajit (mumie, moomiyo). Phytotherapy Research. PMID 23733436. Foundational safety / efficacy narrative review.
  15. Wilson E, et al. (2007). Shilajit: a review. Phytotherapy Research. PMID 17295385. Foundational shilajit composition + traditional use + mechanism review.

Get the complete dosing protocol

Evidence-scored dosing, timing, forms, and who should skip it. One page, no fluff.

Get the protocol

Related free research

Supplements
Plant Sterols & Stanols — The Verdict
 Supplements
Exogenous Ketones — The Verdict
 Supplements
Serrapeptase — Does the Silkworm Enzyme Actually Work?

There are 424 more inside

Conviction-scored verdicts on supplements, nutrition, training, physio, and recovery.

Explore all Get weekly verdicts