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Pürblack
This page collects all available Certificate of Analysis data, third-party lab testing information, and heavy metal safety signals for this product. Data is sourced from publicly available documentation. We do not accept payment from brands.
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA (Dec 2025, Batch 11RUARG001). Heavy metals: lead 0.47, arsenic 0.311, cadmium 0.032, mercury 0.001 mg/kg — all well within norms. Unique radioactivity panel: cesium <1, strontium <1 Bq/kg. Full microbial panel — all not found or below threshold. Authenticity markers: humic acids 19.8%, Urolithin A 39.87 PPM. Strength: unusually comprehensive with radioactivity and authenticity markers. Note: uses Pürblack's own PB test standards rather than a publicly accredited independent lab standard.
Cambium Analytica
The brand publicly discloses that testing was performed by Cambium Analytica. A named, independent laboratory is a key transparency signal — it means results can in principle be traced back to a specific accredited facility.
Status
Claimed — brand states testing was done; specific values not publicly available
The brand states that heavy metals have been tested, but the specific numeric results are not publicly available. This cannot be independently verified without seeing the actual COA values.
Heavy metals to look for in a shilajit COA: lead (Pb), arsenic (As), mercury (Hg), cadmium (Cd). A rigorous COA shows parts-per-million (ppm) values for each, not just a pass/fail stamp. Learn more about shilajit and heavy metals →
Country (claim)
United States
Source region
Multiple
GMP claimed by brand
No (not scored)
Patent claim
Yes
About this data
COA status is assessed based on publicly available documentation as of the last verified date shown on the product page. A certificate is marked “Public” only when it is directly accessible without needing to request it. Heavy metals are marked “Confirmed” only when the COA includes actual numeric concentrations. We do not independently audit laboratory accreditation for every entry.