I'm not kidding you. It does work.

我不是戏弄你，那的确有效。

《牛津词典》

No, I'm not kidding you.

我可没有逗你。

youdao

I'm not kidding you.

我不是欺骗你的。

youdao

I'm not kidding when I say that 95 percent of the screen time is taken up by people telling you what, in a properly written script, you would actually be looking at with your own eyes.

CNN: Review: 'Burn Hollywood Burn' is 86 minutes of pure torture