I am 20 years old slim and i joined gym bodybuilding after each day exercise i take supplement which has70mg cholesterol30gr protein is it alright ?

Supplements: Not recommended because we don' t jknow what the long term effects are and secondly we don't know if the ingredients are pure

Sounds good: Once a day on that supplement should be fine. Specifically, your protein goal would be one gram of protein per pound of body weight to support a weight training regimen. Get the rest from leaner protein rich foods.