MusclePharm Corporation announced the expansion of its product line with Costco U.S with the roll out of its reformulated MP Combat Protein Powder in a newly sized tub. The reformulated product has an improved taste and mixability factor and is now being sold in Costco U.S in a recyclable, 6.2-liter tub. The new product will be part of a promotion running in all Costco U.S stores this March with samples available for customers to try out the new taste.