Snake oil? Scientific evidence for health supplements
Updated September 2015 with a revitalising boost of fresh data. New entries include melatonin, proving travellers were right about its effect on sleep; and good evidence for Vitamin D for flu, bones and long life. Evidence for valerian as a cure for anxiety has dropped, as has any likelihood that cranberry juice has impact on urinary infections. Thanks to visitor suggestions we’ve added entries for supplements that may in some cases be harmful, including Vitamin A, which has been linked to birth defects. Note: You might see multiple bubbles for certain supplements. These is because some supps affect a range of conditions, but the evidence quality varies from condition to condition. This visualisation generates itself from this Google Doc. As ever, we welcome your thoughts, crits, comments, corrections, compliments, tweaks, new evidence, missing supps, and general feedback.