Are diet injections effective?

As the title suggests, I am wondering if diet injections are definitely effective.

Now that summer has arrived and I should be dressing lighter, my body has actually gotten heavier, to the point where I am afraid of summer.

I tried hard to diet on my own, but after losing a little weight, it feels like I'm actually gaining more back due to the yo-yo effect...

It seems like a lot of people are getting diet injections these days.

It’s gotten to the point where people are saying that all the celebrities who lost weight must have gotten diet injections.

I'm thinking of trying diet injections too.

I'm wondering if it hurts a lot, what the price range is, and how many times I need to get it.

If anyone has tried this, I would appreciate it if you could share your experience.