When we go to the grocery store, we're used to checking all kinds of labels. From the expiration date to the calorie count. Now some doctors want you to look for another label - one that says no PFAS. Irish Kerry Gold butter is prized by many consumer reports for its grass-fed goodness. But what consumers may not have realized is that the grease-resistant wrapper contains per- or polyfuloroalkyl carbons, PFAS for short. This is a toxic artificial compound.