PureNorth Supplements Case Study: AI Content Engine for D2C Growth
How a D2C supplements brand tripled ROAS with an AI content engine that personalizes every touchpoint from landing pages to email flows.
Overview
PureNorth Supplements was running the same Meta and Google playbook every D2C brand runs: broad ad creative, one landing page, one welcome flow, and a prayer. ROAS was flat, ad fatigue was constant, and the team was spending more every month just to stand still. Gain Rhino built an AI content engine that writes the right headline, product page, and welcome email for each customer based on how they arrived. The brand went from a flat funnel to a personalized revenue engine without doubling the team.
Research
We started by mapping every customer entry point: which ad they clicked, what quiz answer they gave, when they signed up, and what they bought (or didn't). The pattern was clear. The same customer was being treated the same regardless of intent. We designed an AI content layer that reads those signals and generates a tailored headline, product description, and email subject line in real time, while keeping the brand voice consistent across every touchpoint.
Result
The brand's top-performing ad variant now hits 3.2x ROAS, the welcome email open rate climbed to 47%, and overall return on ad spend tripled in the first 90 days. The team didn't add headcount. They replaced the same manual copywriting loop with an engine that runs 24/7 and gets sharper with every conversion.
By the numbers (first 90 days):
- Top ad variant ROAS3.2x
- Welcome email open rate47%
- Overall return on ad spendroughly 3x
- Time spent on copy revisionsdown by an estimated 80%
