FDA Removes 12 Peptides from 503A Category 2 Newtropin FDA Puts BPC 157, TB 500, and 5 Other Peptides Under the Microscope: What Prescribers Need to Know About the 503A Review Lengea The FDA's Ban of Therapeutic Peptides: A Threat to Health Freedom Slim 'n Sleek The FDA just announced that they're taking steps to lift restrictions on 12 peptides including BPC 157 and TB 500 making them accessible through compounding pharmacies again. This is a HUGE step