Abstract: The integration of aromatherapy into cosmetic formulations represents an emerging field that bridges scientific innovation with consumer well-being. Beyond their traditional role in fragrance, essential oils exert measurable psychophysiological effects through olfactory pathways. This article explores how olfactory interventions can be thoughtfully incorporated into cosmetic products, creating multifunctional formulations that address both aesthetic and emotional needs. Current evidence suggests that essential oils, such as lavender, bergamot and sweet orange essential oils, may contribute to relaxation, stress reduction and improved sleep quality, offering added value to skincare and personal care products. Attention is given to mechanisms of action, formulation challenges, and the importance of safety and sustainability in product design. By bridging aromatherapy and cosmetic science, this contribution highlights the potential of olfactory-centred cosmetics to meet the growing demand for holistic well-being solutions.
Diogo Gonçalves S. Bridging Aromatherapy and Cosmetic Science: Olfactory Pathways to Well-being. Cos ACTIVE J. 2025;3:52–58
INTRODUCTION
The modern cosmetics industry is undergoing a paradigm shift, with increasing emphasis on products that extend beyond aesthetic enhancement to encompass broader dimensions of well-being (1). This trend is driven by consumer demand for multifunctional and ethically developed formulations that integrate beauty, health and emotional balance. Within this context, aromatherapy, the use of essential oils and other volatile plant extracts to influence psychological and physiological states, has emerged as a promising avenue for innovation in cosmetic science (2).
Aromatherapy has historically been regarded as a complementary intervention, mainly for therapeutic purposes. However, recent advances in neuroscience and psychophysiology provide evidence that olfactory stimuli exert measurable effects on mental health (3, 4). These findings open new possibilities for developing cosmetic products that integrate sensorial appeal of fragrance ingredients with functional benefits of ingredients inspired by therapeutic research.
The objective of this review is to examine the potential integration of aromatherapy into cosmetic formulations. Attention is given to the underlying mechanisms of olfactory action, evidence-based effects of selected essential oils, formulation challenges, safety and regulatory considerations, and sustainability aspects. By synthesising current knowledge, this contribution aims to highlight the role of olfactory-centred cosmetics as innovative tools to promote well-being within an ethical and scientifically grounded framework.
OLFACTORY PATHWAYS AND PSYCHOPHYSIOLOGICAL EFFECTS
The human olfactory system plays a critical role in detecting volatile compounds and translating these sensory inputs into physiological and psychological responses (5). Olfactory receptors located in the nasal epithelium transmit signals via the olfactory nerve to the limbic system, particularly the amygdala and hippocampus, which are closely associated with emotion, memory and stress regulation (6). This neuroanatomical connectivity underlines the capacity of scents to influence mood and cognitive functions, forming the basis for their potential in cosmetic and therapeutic applications.
Essential oils have been investigated for their modulatory effects on the autonomic nervous system. Studies indicate that inhalation of lavender (Lavandula angustifolia ), bitter orange (Citrus × aurantium) and sweet orange (Citrus × sinensis) essential oils can induce measurable reductions in heart rate, blood pressure and cortisol levels, suggesting anxiolytic and relaxing effects (7–9). In parallel, evidence from neuroimaging studies demonstrates altered brain activity patterns corresponding to positive emotional states following exposure to these olfactory stimuli (10, 11).
These findings highlight the mechanistic rationale for incorporating aromatherapy into cosmetic formulations aimed at supporting well-being. By leveraging olfactory pathways, cosmetic products can potentially offer functional benefits beyond traditional aesthetic outcomes.
AROMATHERAPY IN COSMETIC APPLICATIONS
Integration of aromatherapy into cosmetic science represents a novel approach to delivering functional benefits through daily personal care products (12). In cosmetic formulations, aromatic substances (mainly essential oils) have been primarily used for their fragrance. However, emerging evidence suggests that these compounds can exert measurable psychophysiological effects, providing mood-enhancing, stress-reducing and sleep-promoting properties. This dual functionality positions aromatherapy as a valuable tool for developing multifunctional, wellbeing-oriented cosmetics.
Evidence-based essential oils for well-being
As already mentioned above, several essential oils have been studied for their psychophysiological effects. Lavender essential oil is among the most widely researched, with studies demonstrating anxiolytic, calming and sleep-promoting effects (13). Bitter orange and sweet orange essential oils have been associated with mood enhancement, reduced perceived stress and improved relaxation (14, 15). Rose and lemon balm essential oils have shown potential in modulating emotional states (16, 17).
In general, the psychophysiological effects of essential oils are mainly mediated by the activation of olfactory receptors following inhalation, while dermal application can indirectly enhance well-being by allowing prolonged scent release and mild local sensory stimulation (18).
Cosmetic formulations
Essential oils are commonly used in skin care products such as creams, lotions, serums (including oil serums and hydrogels) and facial masks, as well as in skin cleansing products such as facial cleansers, shower gels, shampoos and bath products. Incorporating essential oils into these cosmetic products requires careful attention during the formulation optimisation, particularly regarding fragrance and functional properties. Special focus must be given to formulation stability, appropriate concentration of essential oils and compatibility with other ingredients. Achieving a balance between cosmetic activity and sensory acceptability is crucial, as excessively weak, strong or unsuitable scents may reduce user compliance and product satisfaction (19).
SAFETY AND REGULATORY ASPECTS
Essential oils used in cosmetics must comply with safety guidelines and regulations established by the International Fragrance Association (IFRA) and the European Union Cosmetics Regulation (EC) No. 1223/2009 (20). Considerations include maximum recommended or permitted concentrations, potential allergenicity, phototoxicity and interactions with other formulation components, and proper labelling.
Ensuring the safe and effective use of essential oils is essential to maintain both consumer trust and credibility of the product’s cosmetic activity. In addition, by strategically selecting essential oils based on evidence of psychophysiological effects and optimising formulation parameters, cosmetic products can move beyond traditional fragrance roles to serve as tools for holistic well-being.
The following section address formulation challenges and considerations in greater detail, highlighting approaches to maximise stability, cosmetic activity, ethical principles and sustainability.
FORMULATION CONSIDERATIONS AND CHALLENGES
The incorporation of essential oils into cosmetic products offers unique sensory and functional benefits, but also presents formulation challenges related to their volatility, chemical complexity and safety. Achieving effective, stable and consumer-acceptable products requires a balance between scientific innovation and practical formulation strategies (21).
Stability of volatile compounds
Essential oils are susceptible to oxidation, photodegradation and evaporation, leading to alterations in their chemical composition and a consequent loss of a product’s cosmetic activity (22). Essential oil stability is generally influenced by formulation factors such as temperature, pH and interactions with other ingredients.
In practice, stability is most efficiently maintained by the inclusion of antioxidants (e.g. tocopherols, ascorbyl derivatives), appropriate emulsion preparation, including decreasing the exposure to high temperatures, and protective packaging that minimises light and oxygen exposure. pH can also affect stability, particularly under extremely acidic or alkaline conditions, which may sometimes occur in the formulation system during preparation. In scientific research, delivery systems based on specific encapsulation techniques have been proposed as an efficient approach to protect volatile compounds, and thus improve their stability (23); however, their routine use remains limited. Advanced delivery systems are discussed in more detail in the “Delivery systems and sensory aspects” section.
Dosage optimisation and safety
Determining effective and safe concentrations of essential oils is a critical step in formulation design. Excessive levels may cause skin irritation, sensitisation or phototoxic reactions, particularly in leave-on products and when essential oils rich in furanocoumarins (citrus essential oils) are used. In contrast, low concentrations may not deliver perceptible or measurable well-being effects (24). Dosage optimisation must therefore balance effectiveness with tolerability, following international safety guidelines such as those established by IFRA and the European Cosmetics Regulation (EC) No. 1223/2009. It is worth noting that recommended concentration limits also vary according to product type, being generally stricter for leave-on formulations than for rinse-off products, and according to the age of the consumer for whom the product is intended (25).
Delivery systems and sensory aspects
Successful formulation depends not only on stability but also on the sensory experience perceived by consumers. Scent intensity, fragrance harmony and cultural preferences significantly influence acceptance and perceived well-being benefits (26, 27).
To optimise sensorial benefits, advanced delivery systems such as liposomes, cyclodextrins, microemulsions and nanoemulsions are being investigated. In addition to protecting the volatile compounds from chemical degradation, they have been shown to enable controlled release and prolong scent duration, and thus prolonged olfactory effects during product use. The controlled scent release was designed to occur through mechanical or thermal triggers (28). However, industrial use of advanced delivery systems remains limited in standard cosmetics currently available on the market remains limited due to cost and manufacturing complexity, with most cosmetic formulations relying on conventional emulsifiers, stabilisers and fragrance fixatives.
SUSTAINABILITY AND ETHICAL DIMENSIONS
The growing interest in aromatherapy-based cosmetics necessitates critical reflection on the sustainability and ethical sourcing of essential oils. Large-scale extraction of plant materials can place considerable pressure on ecosystems and biodiversity, particularly when derived from wild-harvested species (29). Issues such as overharvesting, land-use change and high water or energy consumption during production may undermine the ecological benefits often associated with naturalness of products. Ensuring traceability and adopting fair-trade practices are, therefore, essential to align cosmetic innovation with environmental and social responsibility (30).
FUTURE PERSPECTIVES OF AROMATHERAPY IN COSMETIC SCIENCE
Advances in formulation science are expected to redefine how aromatherapy principles are applied in cosmetics. Encapsulation and controlled-release technologies, though currently more common in research than in mainstream cosmetic production, hold strong potential for future applications. These systems can protect volatile constituents, enhance stability and enable the gradual release of scent molecules in response to physical or environmental stimuli, thereby improving both functional efficacy and sensory experience (19).
The integration of artificial intelligence-assisted formulation design enables data-driven optimisation of ingredient combinations, stability prediction and personalised product development. In parallel, the shift toward bio-based ingredients and sustainable nanomaterials reflects a growing commitment to environmentally responsible innovation. These approaches may yield multifunctional formulations that support psychological well-being while minimising ecological impact (31).
At a conceptual level, the convergence of aromatherapy and cosmetic science aligns with the expanding field of neurocosmetics, which explores how topical and olfactory stimuli influence neural pathways and psychophysiological states. Future research, particularly studies using neuroimaging techniques and biomarker analysis, will be essential to clarify the detailed mechanisms of action and substantiate claims of mood enhancement or stress reduction.
Nevertheless, despite these promising directions, the scientific validation and standardisation of aromatherapy-based cosmetics face critical challenges. Robust clinical and sensory testing, along with harmonised regulatory frameworks, will be necessary to move beyond anecdotal evidence and establish aromatherapy as a scientifically credible and sustainable component of next-generation cosmetic innovation.
CONCLUSION
Aromatherapy represents a valuable bridge between cosmetic science and psychophysiological well-being, offering evidence-based opportunities to integrate olfactory interventions into everyday products. By leveraging essential oils with demonstrated effects on mood, stress and sleep, and addressing formulation, safety and sustainability challenges, cosmetics can evolve into multifunctional tools that promote both aesthetic and emotional health.
Sara Diogo Gonçalves, M. Pharm.
Clinical Academic Center of Trás-os-Montes and Alto Douro (CACTMAD), University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
sgoncalves@utad.pt
References
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