CleanCleanest ashwagandha in the UK and EU (lab-tested, 2026)
Short answer: Based on published batch lab reports, the ashwagandha products with the most complete independent testing are Boost4Life Premium KSM-66 (EU: measured lead, cadmium, mercury, arsenic, microbiology and label accuracy) and Solvara Ashwagandha Root Powder (UK: measured lead, cadmium, mercury and arsenic from Marfleet Analytical Services). Lowest measured lead in our listings: OstroVit Ashwagandha 200 tabs at 0.045 mg/kg (EU limit 3.0 mg/kg). For UK buyers, Together Health KSM-66 and Sunday Natural KSM-66 Royal publish batch certificates, but these show pass/fail only, not measured values.
Data from published lab reports only; updated 2026-10-16. Not medical advice. Testing status can’t be bought.
Full ashwagandha comparison: sortable table of every product →
Lab results
| Product | Seller | Status | Lab / date | Lead | Cadmium | Mercury | Arsenic | Price | Report |
|---|---|---|---|---|---|---|---|---|---|
| Together Health Ashwagandha KSM-66 500mg | Together Health (togetherhealth.co.uk) · UK | Lab verified | Not named (UKAS-accredited per CoA) · 2025-09-09 | Pass (no value) | Pass (no value) | Pass (no value) | Pass (no value) | £11.99 / ≈£0.40 per day (1 capsule) | |
| Solvara Ashwagandha Root Powder | Solvara (solvara.co.uk) · UK | Lab verified | Marfleet Analytical Services · Apr 2026 | 0.487 mg/kg | 0.051 mg/kg | 0.030 mg/kg | 0.146 mg/kg | — | |
| Sunday Natural Ashwagandha Complex KSM-66 | Sunday Natural (sunday-natural.co.uk) · UK | Lab verified | GBA Gesellschaft für Bioanalytik, Hamburg (Germany) · 2026-06-05 | Pass (no value) | Pass (no value) | Pass (no value) | Not tested | Unknown (UK price not captured) | |
| Sunday Natural Bio Ashwagandha KSM-66 Royal | Sunday Natural (sunday-natural.co.uk) · UK | Lab verified | GBA Gesellschaft für Bioanalytik, Hamburg (Germany) · 2025-10-17 | Pass (no value) | Pass (no value) | Pass (no value) | Not tested | £16.90 / ≈£0.17 per day (1 capsule) | |
| OstroVit Ashwagandha 200 tabs | OstroVit (ostrovit.com) · EU | Lab verified | J.S. Hamilton Poland (PCA accreditation AB 079) · 2025-08-13 | 0.045 mg/kg | 0.0077 mg/kg | < 0.0010 mg/kg | Not tested | €8.99 / ≈€0.045 per day (1 tablet) | |
| Allnutrition Ashwagandha Forte | Allnutrition (allnutrition.pl) · EU | Lab verified | J.S. Hamilton Poland (PCA accreditation AB 079) · 2025-04-22 | 0.082 mg/kg | 0.051 mg/kg | < 0.0010 mg/kg | 0.020 mg/kg | 29.99 zł / ≈0.33 zł per day (1 capsule) | |
| Allnutrition Ashwagandha KSM-66 100 tab | Allnutrition (allnutrition.pl) · EU | Lab verified | GBA Polska (PCA accreditation AB 1095) · 2024-11-26 | 0.088 mg/kg | 0.0304 mg/kg | 0.0017 mg/kg | 0.032 mg/kg | 52.49 zł / ≈0.52 zł per day (1 tablet) | |
| Boost4Life Premium KSM-66 Ashwagandha | Boost4Life (boost4life.ro) · EU | Lab verified | GBA Gesellschaft für Bioanalytik, Hameln (Germany) · 2025-11-13 | 0.16 mg/kg | 0.030 mg/kg | < 0.010 mg/kg | 0.077 mg/kg | 73.50 lei / ≈1.22 lei per capsule | |
| Nature Love Bio Ashwagandha Kapseln | Nature Love (nature-love.de) · EU | Outdated report | Eurofins report, lot 7560177E14711 (best before 02/2025) | — | — | — | — | — | |
| vit4ever Ashwagandha Extrakt | vit4ever (vit4ever.com) · EU | Outdated report | Lab report 26783625 (2023) | — | — | — | — | — | |
| OstroVit KSM-66 Ashwagandha tablets | OstroVit (ostrovit.com) · EU | Outdated report | GBA Polska report, lot 12AKSM009 (Sep 2023) | — | — | — | — | — |
EU 2023/915 limits for food supplements: lead 3.0, cadmium 1.0, mercury 0.10 mg/kg. “Pass (no value)” means the certificate states compliance without a measured figure. “—” means no readable report on file.
FAQ
Which ashwagandha has the lowest heavy metals?
In our listings, OstroVit Ashwagandha 200 tabs has the lowest measured lead (0.045 mg/kg, J.S. Hamilton Poland, Aug 2025). All measured results we hold are well under the EU 2023/915 food-supplement limits (lead 3.0, cadmium 1.0, mercury 0.10 mg/kg).
Is there a lab-tested ashwagandha sold in the UK?
Yes. Solvara (measured values, Apr 2026), Together Health KSM-66 (pass/fail only; the lab is not named, the CoA says it is UKAS-accredited), and Sunday Natural KSM-66 Royal and Complex (GBA certificates, pass/fail) are sold by UK sellers.
Is KSM-66 cleaner than generic ashwagandha?
Not automatically. KSM-66 is a branded, root-only extract; contamination depends on the batch. Check the batch certificate for your lot.
What should an ashwagandha lab report include?
Lead, cadmium, mercury and arsenic with measured values and units, the lab name and accreditation, batch number and date, and ideally microbiology and pesticides.
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