Thrive Yah-Whey Concentrate: Holy CowThrive Holy Cow 4x Concentrated Yah Whey High Potency Calcium and Phosphorous Fermentation Plant Booster 4 Times as concentrated as Yah Whey Why is it called Holy Cow? Well, it's derived from "Yah Whey" which is Holy and Cow Cal from BuildASoil, so naturally, it's Holy Cow!! That and those are the words you're going to tell yourself after the first application! Which one should I get? Holy Cow is a Concentrated Version of Yah Whey. Yah Whey: 1 2