The consumer health digital experience crisis hiding in your data
When we look across the consumer health landscape, the market is buoyant. But is it healthy?
On the surface, it's certainly thriving: the global dietary supplements market reached $192.65 billion in 2024 and is projected to grow to $414.52 billion by 2033.
But look closer, and you'll find some worrying signs hidden in the metrics: e-commerce cart abandonment rates top 70%; supplement subscription models commonly experience monthly churn rates of 5–8%. These are not the markers of rude health; they're symptoms of expectation failure - and that’s what we’re breaking down today.
What is expectation failure?
Expectation failure occurs when the experience customers anticipate doesn't match the one they receive — whether on a website, in an app, or through an e-commerce platform. When that gap opens up, they vote with their feet, and engagement plummets.
Happily, expectation failure is a treatable condition. In this blog series, we'll explore how behavioural science gives us a clear, evidence-based framework for diagnosing expectation gaps and restoring digital health across every touchpoint.
People arrive with expectations long before they interact with your digital experience
We may like to think customers land on our digital channels with an open mind and wallet, but in reality, they arrive with expectations shaped by marketing messages, peer recommendations, and their wider digital experiences.
Expectation Confirmation Theory (ECT) tells us that users form beliefs about usefulness, effort, credibility, and benefits long before they engage with a product. When reality doesn't live up to those beliefs, a gap opens — and it's particularly visible in the UK supplement market, where 76% of adults take supplements, yet 52% find supplement information confusing and only 35% consistently read labels. That's a motivated population actively looking for clarity, reassurance, and guidance — but not often finding it.
Bimuno knew this gap well. Their prebiotic supplements were scientifically sound, but clinical language was quietly creating distance. Words like "stomach" weren't landing — customers needed "tummy." Through audience research and behavioural segmentation, we identified the language barriers and rebuilt their digital ecosystem around accessible, relatable messaging. The result: a 61% increase in sales within six months.
When expectations fail, digital engagement drops immediately
Timing plays a crucial role in ECT. If the functionality, performance, or value a user expects isn't delivered early enough, they abandon their journey before any behavioural intervention can take effect.
It's a pattern that repeats across consumer health. Brands attract strong initial interest — high traffic, high intent, high curiosity — but struggle to convert that early energy into long-term digital health. In the UK, 4 in 10 consumers now buy their supplements online. Yet online supplement retail growth sits at a modest 3.9% CAGR.
Brands are attracting visitors. They're just not keeping them.
If you're seeing a gap between initial engagement and long-term adherence, or if 'unmet expectations' is surfacing as a leading cause of voluntary cancellation, it's time to formulate a treatment plan.
Read how to turn data into decisions in Blog 2 →
Behavioural mechanisms sustain long-term use, but only after expectations are met
Expectations get customers through the door, but behavioural design locks them in. Two mechanisms are particularly well evidenced here:
Habit formation depends on steady repetition and takes a median of 59–66 days to establish, which means customers need to stay engaged long enough for the behaviour to stick.
Specific personalisation speaks directly to a person's needs and preferences, giving them a reason to return. And it works: 69% of supplement users say a personalised regimen matters to them, and 71% show loyalty to the brands that deliver it.
When these mechanisms come together, they strengthen a brand's stickiness across every touchpoint — but only if initial expectations have already been met. Brands therefore need to win in both the immediate Expectation Window (the first moments of interaction) and the longer-term Behaviour Window (the sustained engagement phase) if they want customers to stay and pay.
Next: Learn how behavioural data drives growth in Blog 2 →
What consumer health brands can do next
Expectation failure is the underlying condition that weakens every other behavioural mechanism. Leave it untreated, and the entire digital journey is at risk. Brands need to act like seasoned clinicians: diagnose expectation gaps, assess root causes, and intervene before disengagement becomes chronic.
That starts with a full audit of every digital touchpoint — checking whether the promises you make match the experiences you deliver, and building behavioural scaffolding from day one. When expectation aligns with experience, you create the conditions for long-term digital health.
This is part one of our four-part series on behavioural science in consumer health.
