This site states this specific badge directly: GMP Certified — Good Manufacturing Practices. Supplements are not FDA approved.
Worth crediting this site for attaching the "supplements are not FDA approved" note directly to this badge, rather than separating the manufacturing claim from the regulatory context entirely.
GMP, Good Manufacturing Practices, refers to the facility following recognized quality and consistency procedures — worth reading this as a process standard, distinct from any claim about the finished product's effectiveness.