Why is the secret recipe of coca-cola secret?
Because it's proprietary, a lot of companies have secrets, if the Coke recipe was not a secret then maybe Pepsi would be able to make a better drink than they do. Sorry to all you Pepsi drinkers out there...)
Because if it wasn't then someone would steal it and make millions.
Other many people could buy the products and make them at home, or other soft drink brands could steal it and use it, putting Coco-Cola out of business.
They were trying to make medicine but it tasted really good so it's soda(At school a older man came to my school and he's is realated to the first person who made the first one and he said this)
Smiles are contagious, the CDC is currently working on a solution. Updates shortly.
It wouldnt be a secret ingredient if it wasnt a secret!