June 2026 in “Frontiers in Allergy” In this study, patients with scalp seborrheic dermatitis exhibited distinct patterns of allergen sensitization tied to symptoms, impaired skin barrier, and altered microbiota, emphasizing the need to consider allergen exposure, barrier status, and microbial balance when interpreting patch test results.
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March 2019 in “European Journal of Dermatology” This study concluded that shampoos sold in pharmacies generally contain fewer regulated allergens under EU law compared to those sold in mass-market stores or by mail order, and pharmacy-sold baby shampoos were allergen-free.
October 2022 in “Journal of the American Academy of Dermatology” This study found that "clean" shampoos are less likely to contain allergenic preservatives compared to traditional shampoos, but both types use fragrance equally, which can be irritating or allergenic.
This study reports that diagnosing food allergies in pets requires a strict 10-week hypoallergenic diet trial, followed by a food challenge, to confirm sensitivities to specific diet components like beef, dairy, or preservatives.
February 2025 in “Journal of Cosmetic Dermatology” This study examined the sensitization potential of common hair care products and found that certain ingredients, like cobalt chloride and nickel sulfate, frequently cause allergic reactions in individuals with hair diseases, providing essential insights for personalized treatment strategies.