What should I be careful about when buying fat loss supplements?

I am going to start going to the gym after a year of absence, and I want to lose the weight I gained fast. I’ll buy supplements like proteins, vitamins etc. I’ll also buy fat loss supplements, but as I’ve never bought these before, I don’t know which ones to get.
I’ve heard that the ones with Ephedra are quite harmful if you have heart condition.

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