As demand grows for sophisticated sensory experiences, cooling agents for food and beverage formulation have expanded well beyond traditional menthol. WS-3, WS-23 and WS-5 — members of the carboxamide family — offer formulators precise control over cooling intensity, onset speed and mouthfeel without the strong minty flavour character that menthol inevitably carries. Understanding how each agent behaves is essential for anyone developing products where clean, refreshing sensation is a functional goal.
Why move beyond menthol?
Menthol remains the reference point for cooling, but it brings a dominant organoleptic signature that can overwhelm delicate flavour systems — fruit beverages, dairy applications, confectionery and oral-care products among them. Synthetic carboxamide cooling agents were developed specifically to decouple the cooling sensation from minty aroma, giving product developers far greater formulation latitude. Their activity operates primarily through the TRPM8 receptor pathway, the same physiological mechanism as menthol, yet their flavour and aroma profiles are comparatively neutral.
WS-3, WS-23 and WS-5: key differences
- WS-3 (N-Ethyl-p-menthane-3-carboxamide): Delivers a moderately strong, long-lasting cooling effect with a clean profile. It has a perceptible, faintly sweet character and remains one of the most widely used synthetic coolers in confectionery, chewing gum and breath-freshening applications. Onset is relatively prompt and the duration is sustained, making it effective at low use levels.
- WS-23 (N,2,3-trimethyl-2-isopropylbutanamide): WS-23 is prized for its exceptionally neutral flavour profile — arguably the most odourless of the three. It produces a mild to moderate cooling sensation that blends discreetly into fruit flavors, sports nutrition drinks and dairy formats where menthol's character would be intrusive. Its subtlety makes it popular in Asian beverage markets and has driven significant global interest.
- WS-5 (N-(4-methoxyphenyl)-p-menthanecarboxamide): The most potent of this group by sensory threshold. WS-5 delivers an intense, clean coolness at very low concentrations, making it cost-effective in applications where a strong impact is desired. Careful dosing is important: used above recommended levels it can produce an almost anaesthetic mouthfeel that is generally considered undesirable.
Formulation guidance for food and beverage applications
Solubility is the primary practical consideration. All three agents are lipophilic and require a carrier — propylene glycol, ethanol or a suitable oil — to achieve even dispersion in aqueous systems. In beverage applications, a pre-dissolved concentrate incorporated during mixing is standard practice. For solid formats such as compressed mints, lozenges or powdered drink mixes, adsorption onto a carrier powder or microencapsulation can help ensure uniform distribution and protect against volatility during processing.
Interaction with other flavour components also warrants attention. Cooling agents can modify the perception of sweetness and acidity in a finished product, so sensory evaluation at final formulation stage — rather than at ingredient level — is always advisable. When combining two agents, for example WS-23 for baseline refreshment and WS-3 for duration, the blended effect is not simply additive; small-panel tasting at incremental ratios is the most reliable method for optimising the balance.
Cooling agents in fragrance and personal care
Beyond ingestible products, WS-3 and WS-23 find application in topical fragrance and personal care contexts — particularly in products where a refreshing sensory cue enhances consumer experience. Their relative stability under heat and their compatibility with alcohol-based systems make them practical choices for formulators in these adjacent categories.
Regulatory and safety considerations
In food applications within the UK and EU, cooling agents must meet the requirements of relevant flavouring regulations and should be used within established safe use levels as guided by industry bodies. Formulators are advised to confirm the regulatory status of each agent for their specific category and market before committing to commercial production.
EC Aroma supplies WS-3, WS-23 and WS-5 as food-grade aroma chemicals from its Runcorn facility, available from 1 kg with bespoke cooling flavour systems developed to your brief.
Working on a related brief? EC Aroma develops and matches flavour concentrates from 1 kg MOQ, with full documentation available on request.
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