Related Experiment Videos
Skin reactions to hexylene glycol
1Department of Dermatology, University of Oulu, Finland.
This study compared the skin reactions caused by hexylene glycol and propylene glycol in eczema patients. Hexylene glycol is used in cosmetics and topical corticosteroids, but its safety is not fully understood. Researchers tested 823 patients with patch tests and found that hexylene glycol caused visible reactions in 2.8% of patients, slightly less than propylene glycol's 3.8%. They also found that hexylene glycol did not increase skin dryness as much as propylene glycol. Two patients reacted to low concentrations of hexylene glycol but had no allergic response in follow-up tests. One patient had a strong reaction to both glycols and a confirmed allergy to hexylene glycol. The authors suggest that hexylene glycol may be less irritating than propylene glycol but can still cause allergic reactions. This study helps inform safer use of hexylene glycol in skin products.
Area of Science:
- Dermatological toxicology
- Cosmetic formulation safety
- Allergen screening methods
Background:
Current research has established that propylene glycol can cause skin irritation and allergic reactions. However, the effects of hexylene glycol remain less understood in eczema patients. Prior studies have shown that propylene glycol increases transepidermal water loss, a marker of skin barrier disruption. No prior work had resolved whether hexylene glycol behaves similarly under occlusive conditions. This gap motivated a comparative study between hexylene glycol and propylene glycol in eczema patients. The study aimed to clarify whether hexylene glycol poses a lower irritant risk than propylene glycol. No prior work had examined delayed contact allergic reactions to hexylene glycol specifically. The need for a clearer understanding of its safety profile arose from its recent inclusion in topical corticosteroids. This study sought to address these uncertainties through controlled patch testing.
Purpose Of The Study:
The purpose of this study was to evaluate the irritant and sensitizing potential of hexylene glycol in eczema patients. The researchers aimed to compare hexylene glycol with propylene glycol, a known irritant, under occlusive conditions. They wanted to determine if hexylene glycol causes fewer adverse reactions than propylene glycol. The study focused on delayed contact allergic reactions and visible skin responses. It also aimed to assess whether hexylene glycol affects transepidermal water loss differently. The motivation for this work came from the recent introduction of hexylene glycol into topical corticosteroids. The study design allowed for a direct comparison of the two glycols in eczema patients. This investigation sought to inform safer cosmetic and pharmaceutical formulations.
Main Methods:
The study used patch testing with hexylene glycol and propylene glycol in eczema patients. A total of 823 patients underwent routine patch testing with 50% or 30% hexylene glycol and 30% propylene glycol in water. Researchers assessed oedema and erythema as primary outcomes. They also conducted dilution series patch tests with 1% hexylene glycol. Repeated open application tests (ROAT) were performed to confirm allergic reactions. Transepidermal water loss was measured in both atopic and healthy skin. The study compared the irritant effects of the two glycols under occlusive conditions. This approach allowed for a detailed evaluation of skin reactions and allergic responses.
Main Results:
Hexylene glycol caused visible reactions in 2.8% of patients, compared to 3.8% for propylene glycol. At 50% concentration, hexylene glycol produced reactions equal to 30% propylene glycol. Two patients reacted to 1% hexylene glycol but had negative ROAT results. One patient had a strong reaction to both glycols and a positive ROAT to hexylene glycol. Propylene glycol increased transepidermal water loss in atopic and healthy skin. Hexylene glycol did not show this effect in the same conditions. These findings suggest hexylene glycol is less irritating than propylene glycol. The data indicate that delayed contact allergic reactions may still occur with hexylene glycol.
Conclusions:
The authors suggest that hexylene glycol is less irritating than propylene glycol under occlusion. They observed that hexylene glycol did not increase transepidermal water loss as propylene glycol did. The study found visible reactions to hexylene glycol in 2.8% of patients. These reactions were slightly lower than those for propylene glycol at 3.8%. The data indicate that hexylene glycol may be a safer alternative in topical formulations. The authors propose that delayed contact allergic reactions can occur with hexylene glycol. Their findings suggest that hexylene glycol could be preferable in eczema patients. The study supports further investigation into hexylene glycol's safety profile.
Frequently Asked Questions
The study found that hexylene glycol caused visible reactions in 2.8% of eczema patients, slightly lower than propylene glycol at 3.8%.
Researchers used patch tests and repeated open application tests (ROAT) to confirm allergic responses to hexylene glycol and propylene glycol.
Transepidermal water loss was measured to assess how each glycol affects the skin barrier, with propylene glycol increasing it but hexylene glycol not.
A 3+ patch test reaction indicates a strong skin response, and in one case, it led to a positive ROAT result for hexylene glycol.
The study found that 50% hexylene glycol produced reactions equal to 30% propylene glycol in terms of visible skin responses.
The authors suggest that hexylene glycol may be less irritating than propylene glycol under occlusion but can still cause delayed contact allergic reactions.