Study design
Randomized, placebo-controlled, double-blind trials are generally considered stronger evidence than observational or laboratory studies.
Size and duration
Small or short studies can be useful, but results are less certain. Look for replication across independent groups.
Who was studied
Results apply most directly to people similar to those studied, at the dose studied.
Ingredient vs. finished product
Research on an ingredient is not research on a finished product that contains it. Responsible brands make this distinction clear.
References
Get new articles by email