NAD backs Dove's 24-hour moisture claims after P&G challenge

The US National Advertising Division (NAD) has backed every moisturising claim Unilever makes for Dove Deep Moisture Body Wash, rejecting a challenge filed by rival Procter & Gamble.

The decision, published by the self-regulatory body that polices truth and accuracy in US advertising, centred on four claims: 24-hour moisturisation, "round-the-clock deep moisture," nourishing dry skin, and the "Deep Moisture" product name itself. P&G contested all four. NAD sided with Unilever on each one.

What evidence settled the 24-hour claim?

The pivotal claim — that the body wash offers 24 hours of moisturisation after use — rested on what Unilever called a short-term moisturisation (STM) study. The study was designed to measure skin hydration over a full 24-hour window after a single wash with the product.

P&G fought back with its own studies challenging the STM design. That counter-evidence failed. NAD found Unilever's study was appropriate and sufficient to support the 24-hour claim, and that P&G had shown neither that Unilever's study was flawed nor that its own studies were more reliable.

That burden-of-proof dynamic matters for dermatology-adjacent marketing: challengers don't win by presenting competing data unless they can undercut the respondent's methodology or prove their own work is stronger.

How did NAD read the "round-the-clock" language?

P&G argued that "round-the-clock deep moisture" conveyed significant moisturising benefits persisting well beyond in-shower use. NAD disagreed with that reading.

The watchdog found consumers would likely understand the phrase to mean 24 hours, because the claim appeared above language stating the product "restores moisture for 24 hours." The qualifying line anchored the interpretation, and the claim survived.

What about the nourishment and deposition claims?

P&G also challenged the statements that the body wash "nourishes the driest skin" and "actively regenerates skin's natural moisture." Here Unilever pointed to deposition studies rather than hydration measurements.

Those studies, according to the decision, showed the body wash deposits fatty acids on and within the skin's outer layer. The mechanism: deposited lipids help restore those supporting the skin barrier and moisture retention.

NAD found the claim supported on a communicative basis too. Consumers, it reasoned, would understand "nourish" in the context of the surrounding moisturisation claims — not as a separate regeneration promise.

Why did the product name survive?

The final challenge targeted the name itself. P&G argued "Deep Moisture" falsely implied a moisturising benefit.

Unilever countered that the phrase carries multiple meanings and shouldn't force a name change absent evidence of consumer confusion or deception. With the underlying moisturisation claims already substantiated, NAD saw no basis to order a rebrand and ruled for Unilever.

In a statement published within the NAD decision, Unilever said it was "pleased that NAD found all of the challenged claims that appear in advertising for Dove Deep Moisture Body Wash to be substantiated."

Cosmetics Business has contacted both Unilever and P&G for further comment.

The ruling continues a busy stretch for NAD in personal-care advertising. It recently approved certain Revlon ColorSilk claims after a challenge, and SharkNinja voluntarily modified its "fastest blowout" claims following a Dyson-initiated review. With R&D-heavy rivals increasingly using the self-regulatory channel rather than courts, substantiation files — hydration timelines, deposition data, consumer-perception studies — are becoming the real battleground for functional skincare claims.