What it means
Random assignment balances known and unknown differences between the groups, so any difference in outcome is more likely to come from the treatment.
Quality depends on sample size, how long the study ran, how outcomes were measured and whether it was blinded. Many skincare and supplement studies are small RCTs, so one trial rarely settles a question.
Also known as
- RCT
- randomised controlled trial
- randomized trial
- clinical trial
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Sources
General information, not medical advice. Talk to a clinician about any decision about your health.