The evidence map

Each square is one supplement and one goal. The number is how many studies were found. The color is how strong the evidence is.

StrongModerateWeakNo trials

Sort the map by goal

Rows are sorted by the total number of studies across all goals.

Iron and sleepNo studies in people found for this pair.

Open Iron ›

A high number means the pair is well researched. It does not tell you that the result was a benefit. Open the supplement to see what the studies found.

How evidence is graded

Three steps, the same for every supplement and goal.

Finding the studiesOnly studies in people, found on PubMed.

Scoring each pairEach supplement and benefit gets a score from its studies: how many there are, how many people took part and what they found.

Setting the gradeA score of 3.5 and up is Strong. 1 to 3.5 is Moderate. Under 1 is Weak.

Questions about the method? Read the FAQ ›