they measure the effect of varying an input factor alone, averaged over variations in all other inputs
Quality markers to look for include third-party testing certifications (USP, NSF, or independent lab verification), guaranteed CFU counts at expiration (not just at time of manufacture), specific strain identification (e.g., Lactobacillus rhamnosus GG, not just "Lactobacillus rhamnosus"), appropriate storage requirements clearly stated, and a company that publishes its clinical research or references specific studies
Chang SC, Lin PC, Lin JK, Yang SH, Wang HS, Li AF
Ghanbarzadeh et al., 2015b)
Free of Artificial Colors/Flavors
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