10. Does McDonald's meat contain added hormones?

None of McDonald's chicken in the U.S. contains added hormones, as the use of hormones in poultry is banned by federal law.
But the same can't be said for beef.
"It is common U.S. cattle industry practice to use FDA-approved growth promotants, like naturally occurring or synthetic hormones, in animals being raised to produce beef," McDonald's USA writes. "McDonald’s USA does not have any requirements beyond meeting all FDA regulations for use of growth promotants in cattle."