While going paperless is the safest option, switching to non-phenol receipt paper is a step in the right direction. Thermal paper advertised as "BPA-free" does not mean it is free of other compounds similar to BPA. In fact, the majority of receipts actually contain BPS, now that everyone is on the BPA-free bandwagon! But BPS is proving to be just as toxic. If you can't go paperless, we recommend switching to a phenol-free paper which won't have BPA, BPS, or other phenols that are endocrine disruptors. We are most excited about a new paper option, Blue4est, which uses a physical process rather than a chemical process (see p. 41-42 of link). Contact Koehler Paper group for more information.
Beyond Blue4est, there isn't one clear option that has been proven to be 100% safe for people and the environment; but we've compiled this list of places to purchase phenol-free receipt paper online in a variety of sizes. Currently there are two readily available types of phenol-free paper, Pergafast 201, which is white in color, and Appvion Alpha-Free “Vitamin-C” paper, which has a light orange or yellow tint. While this second paper is advertised as having Vitamin-C as the developer, testing of the paper has shown it to also contain Dapsone, a chemical that can also be toxic.