> ## Documentation Index
> Fetch the complete documentation index at: https://glossary.micahealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Placebo

A harmless substance or treatment designed to look and be given like the actual treatment being studied, but containing no active ingredients.

## Related terms

<CardGroup cols={3}>
  <Card title="Eligibility criteria" href="eligibility_criteria" />

  <Card title="Gender-based eligibility" href="genderbased_eligibility" />
</CardGroup>

[*Source*](https://clinicaltrials.gov/study-basics/glossary)