Nothing in this chapter shall apply to prescription drugs regulated by the Food and Drug Administration under the Federal Food, Drug and Cosmetic Act, 21 U.S.C. § 301 et. seq., to biological products regulated by the Food and Drug Administration under the Public Health Service Act, 42 U.S.C. § 262 et. seq., or to any substance that may be lawfully sold over the counter without a prescription under the Federal Food, Drug and Cosmetic Act, 21 U.S.C. § 301 et. seq.