How to get clinical evidence for a supplement brand

Getting clinical evidence for a supplement brand is a defined process, not an academic mystery. It involves eight steps, most of which are handled by your CRO. Your role as a brand founder is primarily to make decisions at the beginning and sign off at key milestones. You do not need a science background to run a successful trial.

Here is the process from start to finish.

Step 1: Define the claim you want to make

This is the most important step and the one most brands skip. The study must be designed to test a specific claim; you cannot design a study generically and then decide what claim to make from the results.

Your claim should be specific, commercially meaningful, and testable. Examples:

• "Shown in a 12-week clinical study to improve cognitive focus scores in adults aged 30 to 55."
• "Associated with a significant reduction in perceived fatigue over an 8-week intervention."
• "Clinically shown to support healthy blood glucose levels in the normal range."

A vague objective like "prove our product works" will not produce a publishable study or a defensible commercial claim. Start with the specific outcome you want to be able to communicate, and work backwards from there.

Step 2: Choose a study type

The study type should match your claim and your commercial goals. For most supplement brands seeking retail listings or advertising rights, a randomised controlled trial (RCT) is the standard. An RCT randomly assigns participants to either the active product or a control (usually a placebo), which is what makes the results credible and defensible against scrutiny.

For exploratory purposes or early-stage evidence, a single-arm intervention (everyone takes the active product) can produce useful data more cheaply. But a single-arm study does not carry the same evidential weight as an RCT for ASA purposes or retail buyer meetings.

Your CRO will recommend the right study design based on your specific claim, budget, and timeline. See our guide to RCT vs. observational study for a full comparison.

Step 3: Scope the study with a CRO

Once you know your claim and broadly which study type fits, book a discovery call with a CRO. At StudySetGo, this call takes about 30 minutes. We ask about your product, your target claim, your target market, and your timeline. From that conversation, we design three study options at different investment levels (Bronze, Silver, Gold) and send you a written quote within 48 hours.

The scoping process defines:

• The primary outcome measure (what gets tested and how)
• The study duration (how long participants take the product)
• The participant criteria (who gets recruited and from where)
• The study design (randomised, blinded, placebo-controlled or not)
• The fixed price and milestone payment schedule

Step 4: Protocol design

Once you select a tier and sign the contract, the CRO's scientific team writes the protocol. This document defines everything about how the study will be run: the research question, participant inclusion and exclusion criteria, randomisation procedures, blinding methods, outcome measurement schedule, and statistical analysis plan.

You review and approve the protocol before it is submitted to the ethics committee. This is your primary opportunity to ensure the study is set up to test the claim you actually care about.

Step 5: Ethics approval

The protocol is submitted to an independent Research Ethics Committee (REC) for review. Ethics approval is a legal requirement before any participant can be recruited. With a specialist CRO using independent ethics boards (rather than university committees), approval typically takes 3 to 5 weeks from submission.

Step 6: Participant recruitment

Once ethics is approved, recruitment begins. Your CRO recruits participants from their network who match your inclusion criteria, screens them to confirm eligibility, and enrols them into the study. For most nutrition studies, this takes 2 to 4 weeks with a well-established participant network.

Step 7: Data collection

Participants take the product for the duration of the intervention (typically 8 to 12 weeks for nutrition studies) and complete outcome measurements at defined time points. With remote-first data collection, this happens from home: participants use at-home collection kits, validated wearables, or digital questionnaires rather than attending a clinic. This reduces dropout and speeds up the collection timeline.

Step 8: Analysis and publication

Once data collection ends, the statistician runs the pre-specified analysis and the scientific writing team prepares the manuscript. The manuscript is then submitted to a peer-reviewed journal. Once a manuscript is accepted, you can use it in investor meetings and retail buyer discussions. For public advertising claims, the ASA requires evidence to be published in a peer-reviewed journal — accepted-but-unpublished manuscripts do not meet this standard. Plan for publication before making public claims.

The CRO prepares a claims substantiation summary alongside the manuscript, which you use in retail buyer meetings, ad platform reviews, and any other context where you need to provide evidence for your claims.

What you can do with the evidence

Once you have a published (or accepted) peer-reviewed study, the commercial uses include:

• Advertising on Google and Meta with claims referenced directly to the study, reducing the risk of account suspension and improving conversion.
• Retail buyer meetings with a claims dossier that satisfies Boots, Holland & Barrett, and major grocery chains.
• Product packaging and website copy making claims that competitors without evidence cannot legally match.
• Investor presentations with demonstrated product efficacy, which reduces perceived investment risk.
• PR and press coverage using the peer-reviewed publication as a news hook for health media.

The evidence is a one-time investment. The commercial return continues for years.

Frequently asked questions