Regenerative Evidence Guide

Separate promising research from proven care.

Reading Study Evidence: A Guide to Questions Before You Trust a Claim

Maybe it started with an ad. A sales video mentioned a study, a clinic showed a graph, and now you are not sure what any of it proves for you.

You do not need a science degree to sort it out. You need a short set of questions, asked in order, and a way to tell a solid claim from a loose one.

Here is the short answer: to read study evidence, check what kind of study it is, who was in it, what it was compared with, what it measured, how long people were followed, and whether the results were ever posted. This guide walks you through each check, with the source behind it.

What this guide answers How to check a study behind a regenerative medicine claim, one step at a time.
What a registry entry is ClinicalTrials.gov says a registration describes a study; it is not a result.
Example from the registry NCT02861599 planned 150 participants, but its randomized design was abandoned after 2 patients were enrolled in one year.
Small study samples A 2017 systematic review of 26 supplement heart-rhythm studies found sample sizes from 9 to 206 people.
Supplement adverse event reports A 2023 narrative review reports 79,071 reports to FDA’s CFSAN system from 2004 to 2021.
Quality check framework A GRADE-based guide asks readers to weigh six areas before applying a result.

Step 1: Find out what kind of study you are looking at

You are starting with a headline or a claim. You want to know how much weight it can carry.

A study is a formal test of a question, such as whether a treatment changes a measurable result. Not every study carries the same weight. A PubMed-indexed guide in Avicenna Journal of Medicine (2017) explains GRADE, short for Grading of Recommendations, Assessment, Development and Evaluation. It is a framework for judging how far results can be trusted.

You can see what a graded result looks like in a Cochrane review of beginning reading lessons for children with intellectual disability. It rated some findings as moderate-quality evidence and others as low-quality. That review is about classroom reading, not regenerative medicine. It is here only to show how a certainty rating reads.

What this means for you: Name the study type before you weigh the claim. Ask whether people were compared with something, and whether the result comes from one small study or from a combined review.

The how-to-read guide for regenerative medicine studies covers the same first questions in more detail.

Read next

Evidence Hierarchy in Regenerative Medicine: why one study is not the whole answer.

Once you know the study type, the next question is what the sales page is really claiming.

Step 2: Compare the sales claim with the study behind it

You have a claim in front of you, and a study the seller points to. Your job is to see whether the two match.

The seller says its product works in a certain way and cites research. Report that as the seller’s statement. Then check the product in the study, the people in it, and the outcome. The claims evidence guide lays out that check.

Testimonials feel persuasive because they are personal. The testimonials guide explains what a personal story cannot tell you about typical results. If a clinic claims cartilage regrowth, the cartilage claim guide asks which measure would actually show a change.

What this means for you: A claim can cite real research and still say little about the product being sold. Match the product, the people and the outcome before you give the claim weight.

Read next

Platelet-Rich Plasma Study Claims: patient group, comparator and outcome.

Next, check who was in the study and what they were compared against.

Step 3: Check who was studied, what they were compared with, and how long they were followed

You want to know whether the study’s people look like you, and whether the comparison was fair.

Random assignment means chance, not choice, decides who gets the treatment and who gets the comparison. A registry entry shows why this matters. ClinicalTrials.gov lists a study of speech therapy for children with reading difficulties (NCT02861599). It planned 150 participants, but its randomized design was abandoned after 2 patients were enrolled in one year.

The study then compared two non-randomized groups of children managed through different care pathways. When people choose their own group, the groups can differ in ways unrelated to the treatment. The guide to randomization, blinding and placebos defines these terms. The applies-to-someone-like-me guide helps you compare the study group with yourself.

What this means for you: Look at the comparison group first. If there was none, or it was not formed by chance, a good-looking result may not show what the treatment did.

Read next

Surrogate Outcomes and Patient Outcomes: which measures stand in for real health results.

Who was studied tells you whether a result fits you. What was measured tells you what the result means.

Step 4: Look at sample size, safety reports and who paid for the study

You may be looking at a result from a few dozen people. You want to know whether that is enough to rely on.

A small sample gives a rough estimate with a wide range, as the small sample guide explains. A systematic review in the Journal of Dietary Supplements (2017) looked at 26 published supplement studies of heart-rhythm effects measured on an electrocardiogram (ECG). Sample sizes ranged from 9 to 206 people. Eight studies found a significant change in the QT interval, a heart-rhythm measure, and more than 30% showed some ECG change.

The review said the studies were typically well performed but could be strengthened. Before you weigh any numbers, the GRADE-based guide suggests you look at six areas first.

Who paid also matters. A conflict-of-interest disclosure lists financial ties that could affect the work. Safety results need their own check, and the cell therapy guide below shows where serious events are reported.

What this means for you: Small numbers can make a strong-looking result unstable. Check how many people were studied, and whether safety events were counted in the same study.

Read next

Cell Therapy Safety Reports: where to look for serious events.

With the numbers and safety checked, the next step is to confirm what the registry says about the study.

Step 5: Check the registry entry and whether results were posted

You may have found a trial number on a clinic’s website. Now you want to see what the public record says.

A registry entry is the public record of a study’s plan and status. ClinicalTrials.gov states that a registration describes a study and is not a result. A registered trial therefore does not show that anything worked. The NCT02861599 registry page shows its status as UNKNOWN, so the status label is part of what you check.

A plan and a result are different documents. The protocol and result guide explains why a protocol cannot stand in for a finished study. If an entry has changed over time, the registry version guide shows how to record the version and date you saw.

What this means for you: Find the trial ID, open the entry, and note its status and date. If you cannot find posted results, ask the clinic where they are published.

Read next

A Completed Trial With Missing Results: what the registry shows.

If you are weighing a supplement or another option, the next step is to look at its limits.

Step 6: Weigh your options, including supplements and their limits

You may be deciding whether to try something you can buy without a prescription, or whether to see a clinician first.

For lifestyle changes and prescription options, a clinician who knows your history is the right person to ask. Ask which options have trial data for your condition, and what those trials measured. This guide does not cover prescription treatments for a specific condition, so take those questions to your clinician.

Dietary supplements are sold under food rules in the US. A 2023 narrative review in Innovations in Pharmacy argues that FDA oversight of supplements has been weak. It reports 79,071 adverse event reports for supplements, made to the Center for Food Safety and Applied Nutrition between 2004 and 2021. This is a review of cases, not a trial.

The seller of a supplement says what the product is for. Read those claims as the seller’s words, and check the label for the amount per serving. The Better Than PRP guide lists options, costs and questions, and the MagnesiumFreeze ingredients guide covers the product’s amounts and research.

What this means for you: Bring the label, the amounts and the seller’s claim to your clinician. Ask what they know about each ingredient before you buy.

Read next

Undenatured Type 2 Collagen: Research, Dose and Safety: a supplement guide with its research and safety notes.

Last, make sure you know what you are signing before you join a study or have a procedure.

Step 7: Stay safe before you sign anything

You may be close to a decision: a study, a procedure or a purchase. This step covers what to have in writing first.

Ask for the consent form and read it for the expected benefit, the alternatives and what is still unknown. The procedure consent guide lists the questions to ask. Ask also for written aftercare instructions, covered in the written aftercare guide.

If something goes wrong, you can report it. The site’s guide to reporting a regenerative medicine side effect explains the steps.

What this means for you: Do not sign until you have the consent form, the full costs and the aftercare plan in writing.

Read next

Research Consent for a Clinical Study: what to ask before signing.

Your next step

  1. Write down the exact claim and the study it cites.
  2. Find that study by its ID on ClinicalTrials.gov and note its status and date.
  3. Check the comparison group and the main outcome.
  4. Ask whether results were posted, and where.
  5. Ask your clinician which options have trial data for your condition.
  6. Get the consent form, the costs and the aftercare plan in writing before you sign.

Every guide on this topic

If you are reading an ad or a sales page

If you are reading a study

If you are deciding about a study or procedure

If you are looking at a supplement

Regenerative Evidence Guide is a publication. These guides are for education and do not replace care from a qualified professional.

By Regenerative Evidence Guide Editorial Team