Why there are so many nutrition drinks when the ingredients are almost same for every one?

There are lots of nutritional drinks that are available. According to me some of the best nutritional drinks include amul kool, amul shakti, boost, Cadbury bornvita little champs, Cadbury delite and Cadbury hot chocolate toppers. When I went through the ingredients and the nutritional value of these drinks they were almost same. So, I want to know instead of so many drinks why there is not only one energy drink as this variety makes me confuse sometimes.

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