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This study found that antibiotic-induced gut dysbiosis, particularly overgrowth of Lactobacillus murinus, can lead to hair loss in mice by depleting biotin.

This review discusses the complex mechanisms behind acne vulgaris and suggests that dietary modification, along with pro- and prebiotics, may influence its pathogenesis by addressing stress-induced skin inflammation.

This clinical case highlights the importance of early diagnosis of celiac disease, illustrating how recognition of symptoms and risk factors can prevent delayed treatment.

This review discusses symptoms and syndromes associated with iron deficiency, with or without anemia, but reports no new clinical findings; the authors highlight the potential influence of intestinal factors on iron absorption.

This review discusses the potential link between gut microbiota alterations and the onset and progression of alopecia areata, identifying it as a possible pathogenetic factor and therapeutic target, but reports no new clinical results.

This theoretical paper proposes that a subset of Post-Finasteride Syndrome cases may be driven by a gut-derived toxic process involving hydrogen sulphide-producing bacteria, suggesting that the small intestinal microbiome could be a potential target for treating this condition.

This paper proposes a novel theory that certain symptoms of Post-Finasteride Syndrome may be caused by an overgrowth of hydrogen sulphide-producing bacteria in the small intestine, which acts as a mitochondrial toxin, with implications for treatment targeting the gut microbiome.

In this narrative review, dysbiosis was found to potentially influence androgen metabolism and immune response, suggesting that gut microbiota balance may play a role in the prevention and treatment of androgenetic and areata alopecia.

In this case report, a female mixed-breed dog was observed with dermatophytosis, presenting with alopecia in the neck and ear, highlighting the zoonotic nature of the infection caused by fungi that can affect both animals and humans.

This study found that inducing a leaky gut in mice led to increased gut permeability and decreased expression of protective genes, suggesting a potential link to alopecia areata.

This source reports that Malassezia restricta appears more abundantly in fecal samples and may be associated with intestinal diseases such as Crohn's disease and ulcerative colitis, but is also found in healthy contexts; future research could inform targeted therapies.

This review explores the similarities between polycystic ovary syndrome and hemochromatosis in terms of iron overload and suggests that addressing gut dysbiosis might help manage iron levels in these conditions.

This study found distinct hair metal profiles in Parkinson's disease patients, with lower iron and copper, higher manganese and arsenic, and explored their link to gut dysfunction and microbiota dysbiosis, suggesting hair metal analysis as a promising diagnostic tool.

This study observed that fecal microbiota transplantation for ulcerative colitis may also offer incidental benefits such as weight loss, improved hair loss, and relief from axial arthritis and allergic rhinitis.

This systematic review reported that probiotics, prebiotics, synbiotics, postbiotics, and dietary supplements may improve hair density and reduce dandruff severity in individuals with scalp disorders, potentially by modifying inflammation, oxidative stress, and microbiota composition; however, variability across studies limits the strength of these conclusions.

This research highlighted that the gut microbiota may influence ovarian health, suggesting it could be used as a biomarker for early diagnosis and treatment of diseases like PCOS, ovarian insufficiency, and ovarian cancer due to its impact on hormone levels.

T cells and bacteria in the gut and skin help maintain health and protect against disease.

This study suggests that cedrol may improve mitochondrial function, gut microbiota, and intestinal barrier integrity, indicating its potential value in treating inflammatory bowel disease.

This research identified unique gut microbiota patterns in alopecia areata patients, with potential as diagnostic biomarkers and suggesting avenues for microbiota-focused therapies.

This review reveals that PCOS is consistently linked to gut microbiota dysbiosis, characterized by reduced microbial diversity and shifts in composition, which are associated with various PCOS phenotypes and may present opportunities for microbiota-targeted therapies addressing the disorder's underlying pathophysiological mechanisms.

This review explores the connection between the gut-skin axis and the development of dermatological conditions like atopic dermatitis, psoriasis, alopecia areata, and acne, and discusses the potential of probiotics in reshaping the microbiome to alleviate these skin issues.

This research highlights the intricate relationship between the skin and gut microbiome, emphasizing the necessity for a deeper understanding of the "gut–skin" axis to develop new treatments for skin diseases. Results are not reported in the abstract.

This article discusses the role of the microbiome in different forms of alopecia and highlights the importance of Omics approaches for future research, but it provides no new clinical results.

This study reported that mannan oligosaccharides improved the fur quality, immune response, antioxidant status, and gut microbiota of fur-growing raccoon dogs, suggesting they could potentially replace antibiotics in their diet.

This study observed that the cutaneous microbiome in psoriasis patients differs both qualitatively and quantitatively from healthy individuals, suggesting a potential link to psoriasis pathogenesis.

This study found that supplementing raccoon dogs' diets with 0.25 g/kg Platycladus orientalis leaf extract improved growth performance and altered intestinal microbiota, but higher doses may have adverse effects.

This study found that enhancing quercetin bioavailability with EubioQuercetin significantly improved external aging signs in mice and influenced gut microbiota and intestinal gene expression, suggesting potential modulation through the gut microbiota–intestinal barrier axis.

The study found that enhancing quercetin bioavailability with EubioQuercetin may amplify its anti-aging effects in mice by modulating the gut microbiota and improving intestinal barrier function.

In this study, supplementing low-protein diets with 0.75% methionine maintained growth performance, improved fur quality, enhanced nutrient utilization, and supported intestinal microbiota balance in blue foxes, with significant results on several biochemical parameters and nutrient digestibility observed.

This review synthesizes current research on how the interaction between the skin microbiome and exosome-mediated communication influences hair disorders, and discusses how microbiome restoration and exosome-based therapies could advance treatments for conditions like alopecia by promoting hair regrowth and follicular health.