In a way, they do not work. Flush-free Niacin is niacinamide. Like it says, niacinamide does not cause flushing. Unfortunately, it does not control cholesterol, either. read more
It does do a good job of ridding your body of all toxins and giving you a clear UA. I would look for the kind that does not have the flushing effects otherwise it will make your skin crawl when you start to flush. It feels like your skin is on fire so make sure it is the none flushing kind. It will still work, just not give you the heebie jeebie's. read more
People with any health condition including liver or kidney disease, diabetes, high blood pressure, or cardiovascular problems need to talk to a doctor before using niacin supplements. Do not treat high cholesterol on your own with over-the-counter niacin supplements. Interactions. read more