Yes. Most Phase 1 studies and all bioequivalence studies specifically need healthy volunteers rather than patients, and they can't proceed without them. If you're generally well, not on regular medication and within the study's age and BMI range, you're the participant these trials are looking for.
Healthy volunteer studies are also the most intensively monitored research in clinical development, which surprises people who assume the opposite.
Why a trial needs healthy people
You can't tell whether a new drug's side effects come from the drug or from the disease if everyone in the study has the disease. So the first human studies are run in people with nothing else going on, to answer three questions cleanly:
- Is it tolerated, and at what dose? Starting low and escalating carefully
- What does the body do to it? How fast it's absorbed, where it goes, how it's cleared. This is what determines whether a future medicine is taken once a day or three times a day
- What does it do to the body? Effects on heart rhythm, liver enzymes, blood counts, blood pressure
Without that groundwork, no patient trial can be designed safely. Every Phase 3 dose schedule in the world traces back to a small group of healthy people who volunteered first.
Which studies use healthy volunteers?
| Study type | What it involves |
|---|---|
| First-in-human Phase 1 | The earliest human dosing, usually single ascending then multiple ascending doses, often residential |
| Bioequivalence studies | Comparing a generic medicine to the original brand. Short, often two visits with a washout between |
| Vaccine studies | Immune response and safety, typically outpatient with follow-up over months |
| Drug interaction and food-effect studies | How a drug behaves alongside another drug or with a meal |
| Imaging and biomarker studies | Establishing normal reference ranges, sometimes with scans |
Residential Phase 1 studies mean staying in a purpose-built unit for anywhere from an overnight to a couple of weeks, with beds, meals, monitoring and staff on site continuously.
Who qualifies as a healthy volunteer?
Criteria vary by protocol, but most studies look for:
- An age within a specified range, often 18 to 55 for first-in-human work
- BMI within a set band, commonly around 18 to 30
- No regular prescription medication, or none that interacts with the study drug
- No significant medical history, and normal screening bloods, ECG and vital signs
- Non-smoker or willing to abstain, and agreement to limit alcohol and caffeine
- Willingness to use specified contraception during and after the study
- No participation in another trial within a defined lookback period, often 90 days
Common exclusions: regular medication, a chronic condition, recent surgery, out-of-range screening results, pregnancy or breastfeeding, blood donation within a set window, and recent participation in another study.
You'll be screened properly before enrolment: bloods, urine, ECG, physical examination, medical history. A meaningful proportion of applicants are screened out, and finding something unexpected in your results is not rare.
What's actually involved
- Screening visit. Fasting bloods, urine, ECG, vitals, examination, full medical history. One to three hours.
- Dosing days. In a residential study, an early start, a fasting period, then the dose. Serial blood samples follow on a set timetable, sometimes many over the first 24 hours, usually via a cannula rather than repeated needles. Continuous or frequent monitoring of heart rate, blood pressure and ECG. Meals are provided and often standardised.
- In between. Confined studies restrict food, drink, caffeine, alcohol, nicotine, strenuous exercise and sometimes even how long you lie down after dosing. It is not a hotel stay. Bring things to do; the boredom is the most consistent complaint.
- Follow-up. One or more outpatient visits for safety checks after discharge.
Are healthy volunteers paid?
Yes, typically. Healthy volunteer studies usually offer a payment for your time, travel and inconvenience, and the amount reflects the length of the study and how demanding the schedule is. That payment is disclosed in the consent form before you agree.
Two things to understand about it:
- It's compensation for burden, not a wage and not a benefit of treatment. Ethics committees review payment amounts specifically to ensure they don't act as an inducement to take a risk you'd otherwise decline. If a payment is large enough to change your mind about a study you were uncomfortable with, that's the moment to walk away
- Check the tax position yourself. Treatment of study payments can depend on your circumstances, so ask the site how payments are documented and get advice if you're unsure
You cannot boost income by stacking studies. Lookback periods and volunteer registries exist precisely to prevent overlapping participation, and concealing a recent study is dangerous rather than clever.
Is it safe?
Phase 1 units are the most controlled environment in clinical research: staged dose escalation, one participant often dosed ahead of the rest in first-in-human studies, continuous monitoring, medical staff present, and resuscitation facilities immediately available. The unknowns are larger than in later-phase research; the supervision is tighter. See are clinical trials safe for the full picture on trial safety.
Before you apply, check these things
- The study is registered on ANZCTR or ClinicalTrials.gov
- The consent form names the ethics committee that approved it, and you can read the form before your screening visit
- You know the total time commitment, including residential nights and follow-up visits
- You know the payment amount, the schedule, and what happens to it if you withdraw partway
- You know the restrictions during the study, because they're stricter than most people expect
Where to start
Have your ID, a list of anything you take including supplements, and the dates of any previous study participation ready. Then pre-screen — see what pre-screening involves and why the questions get personal.
One practical note that catches people out: blood donation. If you're a regular donor, check the study's deferral window before you book your next donation, because it can rule you out for months.
