Stress Relief Properties of a Cosmetic Routine: Psychobiological Evidence

Everyday life psychosocial challenges may negatively impact health and well-being, contributing to the onset and/or progression of psychological and psychosomatic disorders. Pharmacological treatments can moderate our stress response, but they usually bring about addiction/tolerance and a number of other side effects. Therefore, it is relevant to identify alternative stress relief strategies that are devoid of these unwanted drawbacks. Moreover, the effects of such alternative interventions should be objectively quantified by means of reliable psychobiological parameters.

The goal of this study was to quantify the acute and persistent effects of a cosmetic routine based on the self-administration of a cream (DAVC) enriched with essential oils, namely Juniperus Phoenicea gum extract, Copaifera Officinalis resin, Aniba Rosodora wood oil, Juniperus Virginiana. This aim was achieved by measuring the (re-)activity of the autonomic nervous system (via heart variability indexes) and the hypothalamic-pituitary-adrenocortical axis (via salivary cortisol levels), as well as through psychometric and behavioral assessments.

Fourty women, 25-50 years old, were instructed for a correct mode of self administration of the cream. On day 0, women came to the lab and were instrumented for electrocardiographic signal (ECG) recordings. Initially, a 10-min ECG was collected in resting conditions (baseline). Then, two 20-min ECGs were recorded, each following the self-administration (3-min duration) of the DAVC and a placebo cream (PLAC), in a randomized order. At the end of the baseline and the two post-cream administration recordings, saliva samples were collected. From day 1 to 28, subjects self-administered (at home, twice a day, at wake-up and bed time) either DAVC (n=20) or PLAC (n=20).

On day 29, they returned to the lab and ECGs and underwent a stress test (Trier Social Stress Test, TSST). The test lasted 10 min and consisted in a stress interview (5 min), immediately followed by an arithmetic task. ECGs were collected in baseline (10 min), test (10 min), and recovery (20 min) phases. Saliva samples were collected at the end of the baseline and the middle and the end of the recovery phase. The subjects filled a number of psychological questionnaires, including Profile of Mood States (POMS, on day 0 and 29) and STAI-Y1 (on day 29). In addition, subjects were videorecorded during the TSST, in order to quantify their non verbal behavior patterns (via ECSI).

A single, self-administration of DAVC (day 0) produced a significant, acute potentiation of parasympathetic neural modulation (HF index: 25% increase as to baseline), whereas PLAC produced only a modest change (3% increase). DAVC provoked a modest (10%), non significant reduction of cortisol levels, which was similar to that induced by PLAC.