ConsumerLab tested many brands of both spice and supplement for lead, arsenic, cadmium, and mercury, and published the amounts they found in each brand: https:

ConsumerLab tested many brands of both spice and supplement for lead, arsenic, cadmium, and mercury, and published the amounts they found in each brand: https://www.consumerlab.com/reviews/turmeric-curcumin-supplements-spice-review/turmeric/?search=spice#results https://www.consumerlab.com/reviews/turmeric-curcumin-supple... Paywall