Loading…
Loading…
This page collects all available Certificates of Analysis, third-party lab test results, and testing transparency information for Pürblack products in the ShilajitDB database. Data is sourced from publicly available brand documentation and independent research. We do not accept payment from brands and our assessments are not influenced by commercial relationships.
Brand website: https://purblack.com
COA status
Public — directly accessible without contacting the brand. The strongest signal.
On request — available but requires asking; cannot be independently verified without effort.
None — no Certificate of Analysis is available.
Third-party lab
The named laboratory that performed testing. Only a named, independent, ISO 17025-accredited lab earns full credit in our grading. "In-house" or unnamed labs do not count as third-party.
Heavy metals
Confirmed — the COA shows actual numeric concentrations for lead, arsenic, mercury, and cadmium.
Claimed — the brand states testing was done but specific numeric values are not publicly available.
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA (May 2025, Batch 11RUADJB2). Heavy metals: lead 1.12, arsenic 0.15, cadmium 0.028, mercury 0.002 mg/kg — all within norms. Lead at 1.12 mg/kg is the highest in the Pürblack range (norm 3 mg/kg), likely influenced by the proprietary coffee essential oil blend. Urolithin A: 22.47 PPM. Coffee-derived terpenes (Cafestol 127 PPM, Kahweol 54 PPM) listed as ingredients. Full radioactivity and microbial panels.
Last verified Mar 2026
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA (Aug 2025, Batch 11RUA/IXB). Heavy metals: lead 0.71, arsenic 0.34, cadmium 0.032, mercury 0.002 mg/kg — all within norms. Radioactivity: cesium and strontium both <1 Bq/kg. Full microbial panel — all not found or below threshold. Lead slightly higher than other Pürblack variants at 0.71 mg/kg but well within the 3 mg/kg norm.
Last verified Mar 2026
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
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.
Last verified Mar 2026
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA (May 2025, Batch 11RUATG001). Heavy metals: lead 0.121, arsenic 0.313, cadmium 0.031, mercury not detected mg/kg — among the lowest heavy metal readings in the Pürblack range. Radioactivity and full microbial panel included consistent with other Pürblack products.
Last verified Mar 2026
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA format. Note: the publicly linked COA document for White Rabbit Serene carries the product name "White Rabbit Slim" with Batch 169RUA/M3 — possible mislabelling or shared batch. Heavy metals within PB norms. Full microbial and radioactivity panels consistent with other Pürblack products.
Last verified Mar 2026
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA (Dec 2025, Batch 169RUA/WR2). Heavy metals: lead 0.58, arsenic 0.22, cadmium 0.016 mg/kg — all well within norms. Radioactivity and full microbial panel included.
Last verified Mar 2026
Third-party laboratory
Cambium Analytica
Heavy metals tested
Claimed (unverified)
COA document review notes
COA reviewed May 2026. Pürblack proprietary COA (Dec 2025, Batch 169RUA/M3). Heavy metals: lead 0.42, arsenic 1.14, cadmium 0.031, mercury 0.001 mg/kg — all within norms, though arsenic at 1.14 mg/kg is elevated compared to other Pürblack products (norm 6 mg/kg). Urolithin A: 58.50 PPM — highest authenticity marker value in the Pürblack range. Terpene blend from proprietary organic essential oils.
Last verified Mar 2026
About this data
COA status is assessed based on publicly available documentation. A certificate is marked "Public" only when it is directly accessible (via a link or embedded on the brand's website) without needing to request it. Heavy metals are marked "Confirmed" only when the COA includes actual numeric concentrations (e.g., Pb: 0.15 ppm) rather than a pass/fail stamp. Testing laboratory names are recorded as stated in the COA document; we do not independently audit lab accreditation for every entry.