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Case Study

3 min readUpdated Mar 26, 2026

Case Study: Supplement Brand Doubles Profitable Revenue in 90 Days

Stuck in a growth plateau? This supplement brand broke through by ignoring last-click metrics and following causal recommendations, doubling their profitable revenue in just 90 days.

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Case Study: Stuck in a growth plateau? This supplement brand broke through by ignoring last-click metrics and following causal recommendations, doubling their profitable revenue in just 90 days.

Read the full article below for detailed insights and actionable strategies.

Channel comparison

Platform-reported vs. causal contribution

Platform-reported numbers double-count assists; causal inference reveals reality

Platform reported
Causal (true)
Meta Ads+133% inflated
4.2x
1.8x
Google Ads+174% inflated
8.5x
3.1x
TikTok Ads-68% undercredited
1.2x
3.8x

Case Study: Supplement Brand Doubles Profitable Revenue in 90 Days

Excerpt: Stuck in a growth plateau? This supplement brand broke through by ignoring last-click metrics and following causal recommendations, doubling their profitable revenue in just 90 days.

The Problem: Last-Click Lies

A European supplement brand was stuck. They had a profitable 2.5x ROAS on 50,000 EUR/month spend but every attempt to scale beyond that resulted in diminishing returns. Their agency advised them to keep spending on what was 'working' (last-click conversions), but their growth had flatlined.

The Solution: Causal Clarity

They used Causality Engine's Refinement Queue, which continuously analyzes spend and conversion data to recommend budget shifts. The AI recommended a counter-intuitive move: decrease spend on their highest last-click ROAS channel (Google Shopping) and test a new channel, YouTube. The causal model predicted YouTube had a high potential for incremental lift, despite a low initial last-click ROAS.

The Results: Profitable Growth

Over 90 days, they followed the Refinement Queue's recommendations. The result: their profitable revenue doubled. While last-click ROAS on YouTube was only 1.2x, the incremental ROAS (iROAS) was a staggering 4.5x. They were acquiring new customers who would have never found them otherwise. Their total monthly revenue grew from 125,000 EUR to 250,000 EUR, all while maintaining a profitable blended ROAS of 2.8x.

"We thought we had hit our ceiling. Causality Engine showed us a new path to scale that our entire team had missed. The Refinement Queue is like having a genius media buyer on your team 24/7."

Founder, EU Supplement Co.

Ready to Stop Guessing?

Your data is lying to you. Last-click attribution is a broken model that leads to wasted spend and missed opportunities. It's time to upgrade to a causal understanding of your marketing.

Causality Engine offers a clear path to profitable scaling. For just $99, you can get a one-time analysis that will reveal the true impact of your channels. Or, subscribe for €299/month and get continuous refinement and access to our LLM chat interface.

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Frequently Asked Questions

How is Causality Engine different from Google Analytics?

Google Analytics primarily uses last-click or other rule-based attribution models. Causality Engine uses Bayesian causal inference to determine the *incremental* impact of each channel, showing you what sales would *not* have happened without that marketing touchpoint. It's the difference between correlation and causation.

Is this difficult to set up?

No. Setup is simple and requires no code. You connect your Shopify store and ad accounts (Meta, Google, TikTok, etc.) via a secure integration, and our models begin training immediately. You can have your first causal analysis within 3-5 minutes.

What if I have a small budget?

Causality Engine is even *more* critical for smaller budgets. When every euro counts, you cannot afford to waste it on channels that aren't driving real, incremental growth. Our €99 one-time analysis is designed for brands who need to make every marketing dollar work harder.

My brand is not in beauty, fashion, or supplements. Will this work for me?

While our expertise is deepest in these verticals, our causal models work for any Shopify-based e-commerce business with sufficient data. If you spend over 50,000 EUR/month on ads, we can likely provide significant value.

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