A recent study of canned tuna packed in oil, commissioned by Swiss consumer watchdog group Saldo, revealed toxic chemicals bisphenol A (BPA) and/or glycidol in all of the analyzed tuna products. On the other hand, mercury and 3-MCPD were not found at levels high enough to cause concern.

Saldo reports that it purchased canned and jarred, pink and white tuna products and sent them to an independently commissioned laboratory for analysis. The tuna products were packed in olive oil or sunflower oil.