It is one of the most common myths about the food on our plates. The short answer is simple: no.
The short answer: no hormones
The use of hormones in chickens raised for meat is prohibited. Across most of the world — including Malaysia, the European Union and the United States — it has been illegal to give hormones to broiler chickens for decades. No chicken sold for meat is treated with growth hormones.
So why are chickens bigger today?
Modern chickens reach market weight faster than they did fifty years ago, but the reasons have nothing to do with hormones. Three things drive it: generations of careful selective breeding, well-balanced and precisely formulated nutrition, and better housing, hygiene and veterinary care. Healthier, well-fed birds simply grow better.
It wouldn't even work
Injecting hormones into billions of birds would be impractical and uneconomic. And hormones are proteins — they are broken down during digestion, so adding them to feed would have no effect. The biology and the economics both rule it out.
Every chicken sold for meat is raised without added hormones, by law. A "hormone-free" label is marketing, not a meaningful difference.