Every batch is sent to Eurofins UK and tested for lead, arsenic, mercury and cadmium, plus microbiological safety. Nothing is released for sale before those results are returned and reviewed.
You can read the certificates at /lab-results, see the numeric results per batch at /purity-data, and confirm the batch code printed on your own jar at /verify.
Ayor Health sells pure Himalayan shilajit resin in the UK from £34.99 (20g), £49.99 (30g) and £69.99 (50g). Every batch is independently tested by Eurofins UK and the reports are published in full at /lab-results.