One of many reasons why we love Metagenics

When they test fish oil, they go the extra mile.

Metagenics tests peroxide AND anisidine levels. As oil starts to rancidify, peroxide levels go up. However, after time they decline so if a product is tested after they go down, it wouldn’t show. There is another marker - anisidine – that is a byproduct of oxygenation that will show if an oil has ever been rancid. Metagenics tests both. If a company tests, they usually only test peroxide levels which is incomplete.