A study that follows people forward in time from enrollment—stronger evidence than looking back at old records.Prospective studies recruit subjects and follow them forward through time, collecting data on exposures and outcomes as they occur. This design minimizes recall bias and allows controlled data collection. Prospective studies include clinical trials (interventional) and cohort studies (observational). When evaluating peptide research, prospective human data is substantially more reliable than retrospective analyses, case reports, or anecdotal community reports.