Pros Who Depend On Their Results Depend On Isoflex All new and improved Isoflex (Truly Superior Whey Protein Isolate) is the ultimate in taste and quality. Not only does Isoflex whey isolate protein powder have a brand new look and great taste, using cutting edge technology, it’s a pure 100% whey protein isolate source. Isoflex is significantly lower in lactose, fat, sugar and carbs, compared to regular WPIs too! If you’re looking for the highest quality, most premium and fastest absorbing whey protein isolate powder, then look no further than Isoflex; the best Whey Protein Isolate. Read more below on the best whey isolate protein powder in the market and whey protein isolate benefits.