Lean Mass Gainer....Simply The Best Gainer. Lean Mass Gainer is the only weight gainer on the market to contain a significant amount of 100% microfiltered whey protein isolate, considered the "king" of proteins, in its protein matrix. This protein blend is then completed by adding a special combination of micellar casein and a microfiltered whey protein concentrate (80% protein). In contrast, competing gainers derive a significant amount of their protein from a cheap 35% whey protein concentrate that is loaded with lactose (a milk sugar) and contain very little (if any) whey protein isolate.
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