Understand each type of study

Studies that invite people without a specific condition to take part, often to help researchers understand how the body typically responds.

Listings usually describe visit counts, overall time commitment, and general age ranges.

Researchers observe and record information over time without assigning a specific product or activity.

Often involve surveys, check-ins, or periodic visits rather than a new product.

Participants are assigned to a specific activity, product, or approach so researchers can compare results.

Listings typically outline study phases, visit schedules, and how long the study runs.

Research that looks at habits, routines, sleep, activity, or learning, often using apps, journals, or sessions.

Many take place partly at home with scheduled online sessions.

Studies exploring ways to help people stay well, such as lifestyle approaches or screening methods.

Timelines can be longer, with check-ins spread over months.

Research on wearable, home-use, or diagnostic devices and how people use them in daily life.

Listings often describe how long a device is worn and how data is reviewed.