How to Evaluate a Supplement Marketing Agency's Case Studies (What's Real vs. What's Inflated)
Every supplement marketing agency has a slide with a big number on it.
"312% ROAS." "7-figure launch." "7x revenue in 90 days."
Some of those numbers are real. Some are not.
Most sit somewhere in between, built from the best week an account ever had, not the average one.
This guide shows you exactly how to tell the difference, before you sign a contract based on a slide.
Quick Look
Case study math gets inflated four common ways: cherry-picked date ranges, revenue instead of profit, no baseline to compare against, and ROAS with no CAC or LTV context.
A real case study can survive five direct questions. A fake one usually cannot answer more than one.
The fastest gut check: ask to see the worst month, not just the best one.
Why Supplement Agencies Lean So Hard on Case Studies
Supplement brands are cautious buyers. Most have been burned once already, by an agency, a freelancer, or an in-house hire that did not work out.
A dramatic number short-circuits that caution. It feels like proof, so fewer people ask for the receipts behind it.
That is not proof of dishonesty on its own. But it is exactly the setup that makes inflated numbers easy to slip past a busy founder.
The Four Ways Case Study Numbers Get Inflated
Most inflated case studies use one of these four tricks. Usually more than one at a time.
| The Trick | What It Hides |
|---|---|
| Cherry-picked date range | A 14-day spike during a launch or holiday, framed like a normal month. |
| Revenue, not profit | A brand can 5x revenue and still lose money once ad spend and COGS are counted. |
| No baseline | "We grew them 300%" means nothing if you do not know what they started at. |
| ROAS with no context | A high ROAS on a low-margin supplement can still be an unprofitable account. |
None of these numbers are technically false. They are just presented without the context that would let you judge them properly.
"If an agency will not show you the baseline number, the ROAS they are bragging about is not evidence. It is marketing copy about their own marketing."
Five Questions a Real Case Study Can Survive
Ask these before you sign anything.
A genuine result holds up under all five. An inflated one usually falls apart after the second.
- What was the exact date range, and why that range? Watch for launches, Black Friday, or a single viral video hiding inside a "normal" month.
- What was the baseline before you started? Growth percentages are meaningless without a starting point.
- Is that number revenue or net profit? Ask directly. A confident agency answers this in one sentence.
- Can I see a slower month too? Every real account has one. If they claim otherwise, that is the biggest red flag on this list.
- Can I talk to that client directly? Not a quote pulled from a testimonial page. An actual introduction.
You do not need to interrogate every agency you talk to. But you should feel comfortable asking all five without the conversation getting tense.
If it does, that tells you something too.
What Honest Case Studies Usually Look Like
Real results are less dramatic than the highlight reel version, and that is actually a good sign.
An honest agency will tell you a launch took four months to find its footing before it scaled. They will mention the ad set that flopped before the one that worked.
Be more suspicious of a perfect story than a messy one. Growth in this industry is rarely a straight line, and anyone claiming it was probably left something out.
Red Flags to Watch For
- No client is willing to speak with you directly, ever.
- Every case study only shows a single month, never a longer trend line.
- The word "profit" never actually appears, only "revenue" and "ROAS."
- Screenshots have no visible date range, account name, or platform branding.
Reading a Screenshot Like an Analyst, Not a Buyer
Most case studies live inside a screenshot of an ads dashboard. You do not need to be an analyst to check it properly.
Before you believe the headline number, look at the smaller details around it.
- Attribution window. A 7-day click, 1-day view window shows different numbers than a 28-day click window on the same account. Ask which window is shown.
- Currency and platform. A screenshot with no visible ad account name, no date range in the corner, and no platform logo is easy to fake or misattribute.
- Spend level. A 400% ROAS on $200 of daily spend is a different achievement than the same ROAS on $20,000 a day. Scale matters.
- Product category. A high-margin capsule supplement can carry a ROAS that would be unprofitable on a low-margin protein powder. Compare like to like.
None of this takes long once you know what to look for. It usually takes less time than it took the agency to design the slide.
Already Signed and Now Second-Guessing the Numbers?
Sometimes this question comes up after signing, not before. If your monthly reports feel thinner on detail than the pitch deck was, that is worth addressing directly with your current agency first.
Ask for the same five questions above, applied to your own account. A good agency will not flinch.
If yours does, that is useful information on its own, and our guide on signs you have outgrown your current agency walks through what to do next.
You are allowed to ask for clarity on numbers you are already paying for. Reporting transparency should not stop the moment a contract is signed.
How This Fits Into a Bigger Evaluation
Case studies are one piece of the picture, not the whole decision. Pair this with a broader gut check before you sign, covered in our guide to agency onboarding red flags, which walks through the questions to ask beyond just the numbers.
It also matters how an agency gets paid, since pricing structure shapes which numbers they are motivated to show you. Our breakdown of retainer vs. performance-based pricing explains why a performance-only agency has a different incentive to inflate short-term wins than one on a flat retainer.
Verifying results is only step one. Once you are comfortable with a shortlist, ask what a real onboarding actually looks like so there are no surprises after you sign.
The Bottom Line
A strong case study is not a bad sign. Most good agencies have real ones.
The problem is not the existence of a big number. The problem is a big number with no context around it.
Ask the five questions, check the screenshot details, and treat a founder who welcomes those questions as a better signal than any single stat on a slide.
Where eBrandX Fits In
We built our own case studies page around this exact standard. Real accounts, real date ranges, no cherry-picked 14-day windows dressed up as a typical month.
If you want to see what a transparent supplement ad account actually looks like month over month, not just the highlight reel, our team will walk you through it on a call, including the slower stretches.
We manage Meta, Amazon, and TikTok Shop for supplement and DTC brands, and every result we show a prospective client is a real account they can ask follow-up questions about.
Want to see real numbers instead of a highlight reel? Book a call and we will walk you through actual account performance, including the months that were not perfect.
You can also swap notes with other supplement founders in our Supplements Scaling Insiders community.
