How Supplement Advertising Distorts Consumer Perception of Health Products

Polish Research Suggests Supplement Adverts Cause Confusion

Among 397 adult respondents aged 18–65, only 4.8% correctly identified supplements as food products, while 40.3% classified them as over-the-counter pharmaceuticals. This statistical outcome — a misclassification rate exceeding correct identification by an order of magnitude — suggests that advertising language functions not as informational content but as a pharmacological rebranding mechanism.

Acceptance Rates by Claim Category Vary Predictably

When presented with four advertising transcripts targeting immunity, memory, sleep, and weight management, respondents demonstrated a clear hierarchy of belief:

• Immunity support: 73.1% expected an increase in the body's immunity
• Sleep aid: 69.3% expected a calming effect
• Memory improvement: 57.7% expected noticeable cognitive enhancement
• Weight management: 31.3% expected actual weight loss

The pattern is pharmacokinetically intuitive from a consumer psychology standpoint. Claims targeting subjective or difficult-to-measure outcomes — immunity perception, relaxation, cognitive "sharpness" — achieve higher acceptance than those promising a quantifiable endpoint like mass reduction. Weight management claims are more easily falsifiable in the consumer's lived experience, which depresses belief rates. Immunity claims, conversely, operate in a cognitive blind spot where causality is nearly impossible for the individual to verify post-hoc.

The "Therapeutic Expectation" Is the Core Problem

The authors frame this as an education deficit, citing the need for campaigns to distinguish supplements from medicines. Jerome LeBloch, head of scientific affairs at FoodChain ID, stated the high misclassification rate "is problematic, as this suggests that consumer may consider that supplements may be used to prevent or cure diseases." Cross-regional data supports the structural nature of this misunderstanding. Research from Poland in 2024 found that 43% of healthcare professionals themselves stated supplements are medicines or medical devices, with nearly 50% believing marketing legal requirements mirror those of pharmaceutical products. A Norwegian study cited by the authors indicated that 96% of patients believe supplements undergo safety testing prior to market entry — an assumption with no regulatory basis in most jurisdictions.

Despite the prevalence of pharmacological framing in advertising, 74.1% of respondents stated that advertising health benefits without research-proven efficacy constitutes unfair and misleading practice. This creates a measurable contradiction: the majority of the sample simultaneously absorbs advertising claims and considers those same claims unfair if unproven. Expectation levels correlated inversely with general supplement knowledge, indicating that familiarity with the product category moderates susceptibility — though the base rate of correct knowledge remains critically low at under 5%.

Practical Implications for Consumer Decision-Making

The study authors acknowledge limitations including a modest sample size and assessment of only four advertisements. Nonetheless, the data pattern is consistent with prior investigations. The regulatory classification of dietary supplements as food products — not medicines, not quasi-pharmaceuticals — carries direct consequences for pharmacokinetic expectations. No supplement undergoes the bioavailability testing, dose-response characterization, or adverse effect profiling required of OTC or prescription drugs. When an advertisement implies otherwise through language like "supports immunity" or "improves memory," it constructs a pharmacological frame around a product legally situated outside that framework.

For the consumer, the actionable threshold is straightforward: verify whether a product carries a drug registration number or a food supplement notification. If the latter, any health claim on the label exists in a regulatory space where the burden of evidence is fundamentally different from pharmaceutical marketing. Expectations should be calibrated accordingly — not to the advertising copy, but to the classification code.