When sourcing frozen yogurt powder, you must prioritize the probiotic count (CFU) and the solubility rate. High-quality powders should contain active live cultures such as Lactobacillus bulgaricus and Streptococcus thermophilus to ensure the authentic tangy flavor and health benefits. Additionally, check the overrun potential, which determines how much air the mix can incorporate; a professional-grade powder should support an overrun of 30% to 60% to ensure a smooth, creamy texture without being icy.