Back to Resources

Case Study

3 min readJoris van Huët

Customer Testimonials: Supplement Brands on Causality Engine

For Shopify supplement brands, trust and efficacy are everything. That applies to marketing, too. See how EU supplement companies use Causality Engine to prove their marketing ROI and scale with confidence.

Quick Answer·3 min read

Customer Testimonials: For Shopify supplement brands, trust and efficacy are everything. That applies to marketing, too. See how EU supplement companies use Causality Engine to prove their marketing ROI and scale with confidence.

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

Marketing Efficacy, Proven by Data

In the health and wellness space, claims must be backed by evidence. The same should be true for your marketing. Direct-to-consumer supplement brands across Europe are using Causality Engine to move from correlation-based guesses to causal proof of their marketing's effectiveness. They are building healthier businesses by measuring what truly matters: incremental impact.

"We Cut Our Blended CAC by 30%"

"Our blended Customer Acquisition Cost (CAC) was creeping up, but our channel-specific CACs reported in Google Analytics looked fine. We couldn't figure out the disconnect. The Causality Engine analysis showed us the problem in 48 hours. We were acquiring the same customer multiple times through different channels—a top-of-funnel Google Shopping ad, a mid-funnel Facebook retargeting ad, and a bottom-funnel branded search ad. Our old models saw three acquisitions; Causality Engine saw one acquisition journey with two cannibalistic touchpoints. By reallocating the budget from the cannibalistic ads, we cut our true, blended CAC by 30% without losing a single customer."

    • David Miller, CEO, a €15M revenue sports nutrition brand in the UK*

"Subscription Growth is Up 25% QoQ"

"For us, the key metric is new subscriber acquisition. Our last-click model was telling us to invest heavily in retargeting existing customers with 'subscribe and save' offers. Causality Engine proved this was almost entirely cannibalistic. These customers were going to subscribe anyway. The real incremental growth was coming from an influencer program that our old model barely registered. We shifted our focus and budget to acquiring new customers through high-impact influencers, and our net-new subscriber growth is up 25% quarter-over-quarter."

    • Dr. Lena Weber, Founder, a €7M revenue nootropics brand in Germany*

"Finally, We Can Accurately Forecast Our Marketing Budget"

"Forecasting used to be a nightmare. We'd base it on last-click ROAS, but the actual results never matched the projections. Because Causality Engine measures the true incremental lift of each channel, we can now build predictive models that are incredibly accurate. We know that for every €10,000 we invest in our top-performing YouTube campaigns, we will generate €45,000 in incremental revenue over the next 60 days. This level of predictability has transformed our financial planning and allowed us to secure a new line of credit for growth."

    • Marc Dubois, CFO, a €22M revenue vitamin and supplement brand in Belgium*

[Start Your Causal Analysis](https://app.causalityengine.ai)

Build a Healthier Business

The supplement industry is built on trust. Your marketing should be, too. Stop trusting flawed data from ad platforms that are grading their own homework. Start building your growth strategy on a foundation of causal proof. It's the most effective supplement for a healthy P&L. Learn more about the science of marketing attribution.

See our accessible pricing plans or read testimonials from the beauty industry.

Related Resources

Time to Value: Get Your First Insights in 24 Hours

Free Attribution Report Template for eCommerce Teams

Customer Support: Average Response Time Under 2 Hours

Multi-Touch Attribution vs. Marketing Mix Modeling: Which Is Right for You?

Customer Acquisition Cost Calculator for eCommerce Brands

Get attribution insights in your inbox

One email per week. No spam. Unsubscribe anytime.

Key Terms in This Article

Ready to see your real numbers?

Upload your GA4 data. See which channels drive incremental sales. Confidence-scored results in minutes.

Book a Demo

Full refund if you don't see it.

Stay ahead of the attribution curve

Weekly insights on marketing attribution, incrementality testing, and data-driven growth. Written for marketers who care about real numbers, not vanity metrics.

No spam. Unsubscribe anytime. We respect your data.

Frequently Asked Questions

Are there any compliance issues with analyzing customer data in the supplement industry?

No. We operate in full compliance with GDPR and other privacy regulations. We use anonymized, aggregate data for our causal analysis. We do not access or store any personally identifiable health information (PHI). Our focus is purely on the interaction between marketing touchpoints and transaction events.

Our main goal is increasing Lifetime Value (LTV). Can you help with that?

Indirectly, yes. By helping you acquire more customers through your most effective *new customer acquisition* channels, we increase the size of the cohort that you can then nurture to improve LTV. Our platform focuses on the acquisition side, ensuring you are investing in the channels that bring in high-value customers from the start.

We use a subscription platform like ReCharge. Is your tool compatible?

Yes. We integrate directly with Shopify's data layer, which includes data from most major subscription apps like ReCharge, Bold, and Skio. We can distinguish between one-time purchases and new subscription activations in our analysis.

Ad spend wasted.Revenue recovered.