Placebo-Controlled Trial
A study design comparing a drug against an identical-looking dummy — the gold standard for proving a treatment works.
A placebo-controlled trial gives one randomized group the drug and another an indistinguishable dummy, so expectation, attention, and time affect both equally; whatever separates the groups is the drug. In weight trials the placebo arm also receives the lifestyle counseling, which is why "placebo lost 2.4%" appears in STEP 1 — people do lose some weight on structure alone.
The design explains the honest way to read results: the drug's effect is the gap between arms, not the raw number. It's also the sharpest filter for supplement marketing — "clinically studied ingredients" without a randomized placebo comparison is a phrase doing heavy, unearned lifting.
This glossary entry is general information, not medical advice, and is written to be consistent with FDA prescribing information and primary trial publications as of its last review. Always consult a licensed healthcare provider for personal medical decisions.
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