Im echoing what Amedion said above. If you're having high cholesterol, you should first focus on changing your diet to help lower it down. Mass gainer is loaded with sugar. It's better that you take the standard whey, mix it with those oats that can help lower cholesterol and take them daily. add fruits i.e. banana to increase the calorie count.

If what you said is true, you eat clean, train regularly, then the first thing you should do is to get this checked with your doctor. They may prescribe you some medication to help lower it down.