Are energy drinks safe?

[Sweet Krissy]

Hi this is my first post and this forum seems very helpful, so im looking for some help. I work alot and it seems that I never have enough energy. I thought of trying energy drinks but I've heard that they can have some bad side effects. I found a free energy drink online and I'm thinking of trying it but first I want to find out how safe these drinks actually are from people who actually drink them.

Thanks so much I'll look forward to your answers!