No problems here at all. I got no clumps whatsoever. Alpha Tren The only problem is because of the large scoop, you have to use more liquid or it is too thick. But when you understand this the Hydro Builder is probably the best of the 3 for mixability.The protein blend of the Hydro Builder is second to none. They've really put everything from whey isolate to to egg albumen. Of the 3 Hydro Builder has definitely the best protein profile and it also has added 2g of like Pro Complex does. it.I've tried both the Chocolate and Vanilla flavors. The chocolate was pretty good but the vanilla not so much. It has an after taste that is probably due to the added creatine Of the 3 protein blends in my comparison Pro Complex is the best tasting to me and Hydro Builder is the least. http://www.puravolantiaging.net/alpha-tren-reviews/