Dr. Clark Store

CRO & UX Optimization for a Leading Supplements Brand

Overview

Dr. Clark Store is a long-established e-commerce retailer in the vitamins and supplements market. Its bundled vitamin packs account for most of its sales and present a strong opportunity for optimization.

The project focused on increasing the E-commerce Conversion Rate (ECR) and Average Product per Visitor (APPV) through a structured Conversion Rate Optimization (CRO) program centered on A/B testing and targeted UX improvements.

By enhancing clarity, surfacing key product details earlier, and promoting high-value bundles, the store achieved measurable gains in both conversion and revenue.

The Challenge

The site lacked some of the trust and clarity that first-time buyers expect in the health industry. Users had to scroll to find ingredient details, mobile visitors often missed promotional offers, and product bundles were not clearly presented.

The objective was to build more trust in the supplements, increase visibility of high-value products, and encourage larger cart sizes while keeping the site visually consistent.

Approach

Using Google Analytics, Hotjar, and Microsoft Clarity, we mapped friction points throughout the funnel. Each hypothesis was then validated through A/B testing in Convert.

The work focused on three principles:

1. Build credibility with trust and review elements.
   
   
2. Improve clarity by restructuring product information.
   
   
3. Increase revenue per visitor through intelligent bundling.
   

Notable Tests

Test #2: Add Sticky Announcements Bar on Mobile

This experiment tested the effect of keeping key promotional messages visible on mobile devices at all times. The persistent bar contained real-time promotions such as free shipping and limited-time discounts, designed to keep users aware of incentives throughout their browsing session.

Before

After

Results‍

Insight
The sticky announcement bar provided constant visibility to key offers, resulting in higher engagement and a moderate lift in conversions, particularly on mobile devices where limited screen space often hides promotional content.

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Test #6: Add “Shopper Approved” Widgets on Homepage

This test measured the effect of adding verified review in the top navigation bar. The goal was to reinforce trust among new visitors and reduce hesitation during the first impression.

Before

After

Results

Insight
Social proof increased user confidence and helped convert first-time visitors. The small drop in average product per user suggested that new buyers were more likely to start with smaller orders, validating that credibility elements should be balanced with higher-value offers.

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Test #10: Move Ingredient Information Higher on Product Pages

This test repositioned detailed ingredient data closer to the top of product pages. For supplement shoppers, ingredient transparency is often the key deciding factor, and presenting it earlier helped users validate product quality faster.

Before

After

Results‍

Insight
Making essential product information immediately visible improved trust and reduced friction in the decision process. Users who felt informed earlier were more confident to proceed, resulting in both higher conversions and larger cart sizes.

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Test #14: Bundle Offer: Fungal Fighter + Bug Buster

This experiment introduced a discounted product bundle for two frequently purchased items: Fungal Fighter and Bug Buster. The hypothesis was that combining high-synergy supplements would increase total revenue per visitor and encourage repeat purchasing.

Before

After

Results

Insight
The new bundle simplified the shopping process and incentivized multi-product purchases. This structure drove immediate revenue gains and also provided a replicable model for future cross-sell and upsell strategies across other product categories.

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Performance Summary

Over the course of 10 A/B tests:

Each successful variation was implemented permanently, leading to sustained growth in conversion rate and order value.

Client Review

“The team was a pleasure to work with. We increased our sales by 22% by optimizing conversion rates and improving user experience. Some changes raised revenue per visitor as well as conversion rate, meaning customers bought more per order.

They were super organized with everything on Trello. Proactive, reliable, and always on time, they helped us prioritize which improvements would drive the biggest impact first.”
— Justin Justinussen, Product Lead Manager, Dr. Clark Store

Conclusion

Every improvement was tested, measured, and implemented based on data. By combining UX clarity with evidence-based CRO, Dr. Clark Store turned its vitamin bundles into a consistent revenue driver.

If your e-commerce site needs the same kind of structured growth, our team at Charly Agency can design, test, and optimize your store for measurable results.