The term proprietary blend is used throughout the supplement industry as a way to mask certain fillers that Ultimate Muscle Black Editiongo into specific products. For instance, if a product contains 500mg of proprietary blend it could be masking several different ingredients such as sugar, caffeine and corn starch which are solely used as fillers which don’t serve any purpose what so ever. Another factor that must be taken into consideration before using a testosterone booster such as tribulus is the effects alcohol has on testosterone production within the body.