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This study demonstrates that keratin K2 is crucial for proper keratinocyte structure and function in specific mouse skin areas, and its deficiency leads to cellular aggregates and skin abnormalities.

This study found that intradermal administration of adipose-derived stem cell–conditioned medium significantly increased hair density and dermal thickness, suggesting potential regenerative effects on both hair follicles and the interfollicular scalp in patients with alopecia.

This study found that UVA and UVB exposure increased hydroquinone and sunscreen absorption in nude mouse skin, with less absorption enhancement observed in more lipophilic sunscreens.

This study explored the effects of TTFE on male androgenic alopecia, finding that topical application increased hair density, follicular diameter, and scalp hydration while reducing water loss and sebum production in a 12-week trial.

This article reviews EU cosmetic product claim regulations and highlights increased harmonization and enforcement while reporting no new results.

This study evaluated a levan-based polysaccharide, POLEVAN®, in shampoo formulations and reported that it significantly increased hair glossiness by 24%, allowed a reduction of surfactant content by up to 50% without affecting foam, and maintained scalp moisturization similar to hyaluronic acid in a clinical setting.

This study concluded that a regimen containing functional antioxidants and barrier-enhancing agents reduced hair shedding and increased perceived hair fullness in participants with self-perceived hair thinning over 24 weeks.

This study reported that using piroctone olamine in either a shampoo or leave-on product form significantly increased hair retention and improved scalp condition in women with perceived hair thinning.

In this study, oral Pycnogenol® intake was reported to significantly increase hair density and improve scalp microcirculation in Han Chinese menopausal women over six months.

This study found that mice lacking alkaline ceramidase 1 with elevated skin ceramide levels showed disrupted skin homeostasis, including altered hair follicle structures, increased water loss, and a hypermetabolism phenotype.

This study found that conditional knockout of N-WASP in keratinocytes of mice led to skin barrier defects, increased immune cell infiltration, and hyperproliferation of keratinocytes, indicating its crucial role in skin homeostasis.

In this study, targeted deletion of the stearoyl-CoA desaturase 1 gene in mice disrupted the epidermal lipid barrier, leading to increased water loss, impaired thermoregulation, and metabolic issues.

In this study, a new emulsion containing CBD and ginger root extract significantly reduced symptoms of dry and eczema-prone skin, such as erythema and itching, in a clinical trial.

This review explains that linoleic acid deficiency can lead to skin and growth issues but notes that such deficiencies are rare in well-nourished Western populations; it reports no new clinical findings.

In this study, researchers found that negative pressure fractional microneedle radiofrequency significantly improved periorbital wrinkles, hydration, and dermal thickness in patients with periorbital aging, while also increasing orderly collagen and elastic fibers, with minimal adverse effects reported.

This study showed that vitamin D receptor gene-deficient rats exhibit hair loss and skin abnormalities due to differences in gene and protein expression patterns, while ligand-independent VDR action is crucial for normal hair cycle maintenance and skin formation.

This review discusses the essential role of linoleic acid in preventing deficiency symptoms and enhancing skin function, but notes that scientific knowledge on its potential therapeutic use for skin diseases remains limited.

This study demonstrated that a ligand-independent action of the vitamin D receptor significantly affects keratinocyte behavior in hair follicles and skin, pointing to its crucial role in maintaining normal hair and skin structures in rats.

This study found that combining Aliaxin® Global Performance with Viscoderm® Skinkò E improved hydration and appearance of nasolabial folds more effectively than using Aliaxin® Global Performance alone.

This study found that dietary supplementation with collagen, chondroitin sulfate, low-molecular weight hyaluronic acid, Pycnogenol®, and coenzyme Q10 significantly improved skin hydration, elasticity, nail hardness, and hair condition in patients with age-related dermatological changes after 12 weeks.

In this study using tamoxifen-inducible claudin-1 knockout mice, researchers observed that tight junction barrier leakage induced stratum corneum barrier defects and skin inflammation, suggesting a possible cycle of barrier damage and inflammation in atopic dermatitis.

This article discusses the role of stratum corneum disruption in dandruff and suggests that treatments improving scalp barrier integrity along with antifungal activity may be beneficial; it reports no new research findings.

mTORC2 is crucial for healthy skin barrier by regulating lipids and filaggrin.

This review discusses how menopause affects skin structure and function, finding associations between menopause and common skin conditions, but reports no new clinical results.

This study found that applying controlled hypobaric stress to the skin significantly improved the in vitro and in vivo penetration of macromolecules, facilitating enhanced drug delivery.

This study found that individuals with heterozygous truncation-type variants in the *DSP* gene exhibit lower skin temperature and higher transepidermal water loss, with specific microscopic skin changes and pseudomonilethrix.

In this study, combining treatment for acne and sensitive skin improved clinical outcomes and skin physiological function more significantly than treating acne alone in patients with acne and sensitive skin.

This study observed that inducible deletion of the Ugcg gene in mouse epidermis led to a significant reduction in GlcCers and epidermal POS-Cers, causing impaired skin barrier function and delayed wound healing.

This study reported that topical ω‐0‐acylceramide improved skin barrier function in Jack Russell Terriers with TGM1-deficient autosomal recessive congenital ichthyosis, normalizing skin pH and reducing transepidermal water loss.

This review discusses the role of shaving technology and specific skincare ingredients like glycerine and niacinamide in improving male facial skin health, but reports no new clinical results.