Enzymedica UK: 6× industry conversion on Black Friday 2021 (15.69% UK-only, £6,911 / 98 orders in one weekend)

Headline metric: 11.22% sessions-converted across the 4-day Black Friday weekend (26–29 Nov 2021). 15.69% if you filter to UK-only traffic. The 2020 e-commerce industry average was 2.58%.

Total sales (weekend): £6,911.31 across 98 orders, £71.46 average order value.

Time to result: 30-day engagement, peak measured Black Friday weekend (Fri 26 Nov – Mon 29 Nov 2021).

Engagement type: Growth retainer with TMC Ventures Europe Ltd., the Exclusive UK Distributor for Enzyme Science Ltd.

Sustained outcome: ~11% sessions-converted held through December 2021, one of the toughest months for health-supplement sales.

The challenge

Enzymedica UK ran on Shopify. The Black Friday window is the most revenue-concentrated weekend of the year for health supplements. TMC Ventures had been growing the brand's UK presence for over a decade; the brief for Black Friday 2021 was straightforward, maximise conversion across the long weekend without increasing ad spend.

The constraint was real. December is the worst month of the year for health supplements (post-Christmas guilt cycle suppresses purchase intent). Any winner shipped during the 30-day engagement had to hold up against that headwind, not just spike during the promo.

What I did

A 30-day engagement, three compounded CRO wins shipped in sequence:

1. Pricing-page anchor restructure. The multi-pack product tiers had the highest tier discounted aggressively, undermining the anchor for the middle tier. Audience-hypothesis review and quantitative funnel data confirmed the issue. Re-tested with a different anchor structure. Winner shipped at 99% confidence (The 99 Rule) inside the first week.

2. Add-to-cart flow simplification. Heatmap data and session recordings surfaced rage-click patterns on the variant selector. Layer 3 evidence (heatmap) plus Layer 4 evidence (post-purchase survey verbatim) ranked the hypothesis high enough to ship ahead of cosmetic tests in the queue. Winner sustained.

3. Trust-element relocation. Customer-review widget had been inserted below the fold. A/B test moved it directly above the price-tier block. Winner held through the cold-traffic spike of Black Friday weekend, when trust signals matter most.

Each test was operator-set against expected revenue impact. Each winner was gated at 99% statistical significance. Each losing variant was logged with a hypothesis-failure-mode tag for future reference. The full Evidence Stack running on every test.

The outcome (numbers straight from the Shopify Overview Dashboard)

Top traffic sources for the weekend: Direct 571 sessions / Search 203 / Social 16 / Email 3. Sales attributed to marketing: £1,456.21.

The 30-day engagement pre-paid for itself within the Black Friday weekend alone. The ~11% conversion rate held through December 2021, the toughest month in the category, proving the wins were structural, not promo-day adrenaline.

On the record

Arnie Liepa, owner of TMC Ventures Europe Ltd., wrote on 30 Nov 2021 after receiving the final Friday-Monday stats package:

"It seems to have gone pretty darned well, slightly better than I expected, so thanks to you and Leyla for that. With Gratitude, Arnie."

The earlier Saturday-morning version (after day-1 results came in):

"That is really great news – Thanks to you and Leyla. Amazon sales also saw a lift, so good results all round. Onwards and Upwards."

Loom analytics review on file: https://www.loom.com/share/d20fd92f4d5e49a88a92c9c0d5e28570

What this case proves

The 4-to-34 Gap is real even on stores with mature CRO programmes. Enzymedica UK had been running for a decade under TMC Ventures before this engagement. Moving the conversion rate to 11.22% overall (15.69% UK-only) on the same promo day required all four Evidence Stack layers running in sequence: operator-set hypotheses, sample-size discipline, the 99% winner-call, and failure-as-information feeding the next test.

The same playbook is the engine of every Growth retainer engagement today.

Where the relationship ended

The Enzymedica UK + TMC Ventures distributor relationship ran from roughly 2010 to late 2023, when Enzymedica corporate took on a new VP of online sales who chose to bypass the UK distributor and sell direct on Amazon UK. The Enzymedica UK website was shut down at the end of January 2024. The case study above describes work done while the UK channel was operating, and the numbers are exactly as the Shopify dashboard recorded them at the time.

That ending isn't part of the win, but it's part of the story. TMC Ventures' sister brand, Cura Nutrition, continues to operate.