What is the most used supplement in the world?

I'm curious to know, which supplement is the most widely consumed globally? With so many options available on the market today, ranging from vitamins and minerals to herbal remedies, it's intriguing to ponder which one reigns supreme in popularity. Is it a classic like multivitamins, or perhaps a more specialized supplement like omega-3 fatty acids? Or could it be something entirely different that has captured the hearts and minds of supplement enthusiasts worldwide? It would be fascinating to learn more about this prevalent product and why it has become so popular.