For lowering cholesterol levels, the amount of beta-glucan used in clinical trials has ranged from 2,900 to 15,000 mg per day. For enhancing immune function, an effective amount has not yet been determined due to the lack of studies in this application. However, manufacturers of beta-glucan products usually recommend between 50 and 1,000 mg daily (to be taken on an empty stomach), although some products contain as much as 500 mg per capsule.