From past few week, I having body cleanse product but I'm not sure if its good for health.

I very much doubt it. You see, the body cleanses itself naturally, so there's no real need for a product like this. Also, if it entails you only eating a certain food, or sticking to liquids only, you're missing out on a wealth of healthy nutrients that you're body needs.

Is there any reason why you're doing this?

If it's for fast weight loss, the weight loss will come back on as soon as you've finished the 'cleanse'.

I'd personally advise against it.

Hope that helps - message me if you've any further questions.