Honed Proof
How to find a clinical trial.
A plain-English guide to searching for trials, reading the listings, asking the right questions, and spotting the red flags.
How to search
The main public registry is ClinicalTrials.gov, run by the U.S. National Library of Medicine. It lists trials worldwide — tens of thousands of them. Here's how to narrow it down:
01 Search by condition
Start with the condition name (e.g. type 2 diabetes). Use the medical term if you know it — it matches more listings than casual descriptions.
02 Filter by location
Trials happen at specific hospitals and research centers. Filter by your city or state, and decide how far you're willing to travel — many trials require regular in-person visits.
03 Filter by phase
Phase 1 trials test safety in small groups; Phase 2 tests whether it works in a few hundred people; Phase 3 is the large trial comparing against standard treatment. Earlier phases carry more unknowns — later phases have more safety data behind them.
04 Check the status
Only some listings are actually enrolling. See the status decoder below.
Status decoder
● Recruiting
Currently enrolling participants. This is the status you want.
● Active, not recruiting
The trial is running but full — no new participants being accepted.
● Completed
Finished. Results may or may not be posted yet — completed doesn't mean successful.
● Terminated or Withdrawn
Stopped early. Sometimes for business reasons, sometimes for safety or because it clearly wasn't working. Worth knowing before you get excited about an old listing.
Eligibility criteria, in plain English
Every trial lists who can and can't join. Inclusion criteria describe who they're looking for (age range, diagnosis, disease stage). Exclusion criteria describe who can't join (other conditions, medications you're taking, prior treatments). These rules exist to keep participants safe and the results clean — being excluded isn't a judgment on you, it's how the science stays valid.
Questions to ask the study team
Every listing has contact information. Before committing, ask:
Red flags
They want you to pay to join
Legitimate trials do not charge participants an enrollment fee. If someone asks for money to get you into a trial, it's a scam — full stop.
Guaranteed results or miracle language
"Guaranteed cure," "no side effects," "doctors don't want you to know" — real research doesn't talk like this. Uncertainty is the honest signal.
Pressure to decide immediately
A real study team gives you time, encourages you to talk to your doctor, and puts everything in writing first. Urgency is a sales tactic, not a science tactic.
No institutional review board (IRB) mentioned
Legitimate trials are overseen by an ethics board. If there's no mention of IRB oversight or informed consent documents, that's a serious problem.
Your rights as a participant
Before anything happens, you'll go through informed consent — a written document (and a conversation) explaining the trial's purpose, procedures, risks, and your rights. And the most important right: you can leave at any time, for any reason, with no penalty. Your regular medical care continues regardless.
Want to understand what trial phases actually test? Read What "FDA Approved" Actually Means. And when a headline calls something a breakthrough, run it through the Breakthrough Evidence Checker.