February 2026 in “Animals” 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.
November 2022 in “Animal Bioscience” This study found that adding methionine to a low-protein diet improved wool production and feed efficiency in Angora rabbits by promoting hair follicle development through mechanisms involving IGF1, KAP, and versican signaling.
11 citations
,
September 2012 in “Journal of animal physiology and animal nutrition” This study demonstrated that mink hair growth and pelt quality significantly depend on dietary protein levels and DL-methionine supplementation during the growing-furring period.
20 citations
,
September 1998 in “PubMed” In this study, a dietary protein deficiency was identified as the cause of alopecia and weight loss in captive western lowland gorillas, and protein supplementation improved their condition.
3 citations
,
October 2022 in “Han'gug dongmul jawon gwahag hoeji/Han-guk dongmul jawon gwahak hoeji/Journal of animal science and technology” This study found that L-glutamine supplementation in Hanwoo steers under heat stress did not affect growth performance or muscle and adipose tissue gene expression but was associated with increased immune cells and reduced HSP90 expression.
2 citations
,
November 2025 in “Nutrition Journal” This study found that an 8-week supplementation with specific probiotic strains improved hormonal markers and oxidative stress while decreasing inflammation in women with PCOS, although clinical symptoms like acne and hirsutism showed no significant improvement compared to the placebo group.
March 2022 in “Annals of Bariatric Surgery” This study found that protein supplements combined with micronutrients reduced hair loss more effectively after sleeve gastrectomy in women, compared to routine multivitamins alone.
81 citations
,
May 2019 in “Frontiers in Endocrinology” This study found that administering melatonin for 12 weeks to women with PCOS significantly reduced hirsutism, testosterone, and inflammation markers, while enhancing antioxidant levels compared to a placebo.
March 2025 in “Journal of Medical Research and Surgery” This report details a case of severe protein-energy malnutrition resembling kwashiorkor in a 43-year-old woman after bariatric surgery, highlighting the crucial role of early diagnosis and a multidisciplinary approach in managing nutritional complications and improving outcomes in similar patients.
70 citations
,
June 2010 in “Clinics in Dermatology” This review discusses how changes in hair and skin may indicate underlying vitamin deficiencies and emphasizes the need to identify populations at risk for these deficiencies; it reports no new results.
19 citations
,
January 2015 in “Current problems in dermatology” This review discusses environmental factors like UV radiation and smoking that affect hair health and highlights the potential role of nutrition, but it reports no new results.
15 citations
,
January 1971 in “British Journal of Dermatology” Hair can indicate early signs of metabolic disorders, with issues like protein deficiency stopping hair growth.
9 citations
,
November 1978 in “Diabetes Care” This study suggests that behavior modification, semistarvation ketogenic regimens, and surgical therapy could be experimental approaches for different degrees of obesity, with their efficacy varying by the degree of weight excess.
July 2026 in “International Journal of Dermatology Sciences” This review synthesizes traditional hair-care practices from diverse cultural regions and evaluates them against scientific evidence, noting that some, like coconut oil application, have clinical support, while others rely mostly on in vitro or theoretical backing.
This review explores the connection between COVID-19 infection and telogen effluvium, highlighting the potential contribution of inflammatory and emotional factors to hair loss; it reports no clinical results.
54 citations
,
April 2007 in “Gastroentérologie clinique et biologique” This review highlights that bariatric surgery can increase nutritional deficiencies in morbidly obese patients, with particular emphasis on the risks of deficiency due to reduced food intake and malabsorption.
15 citations
,
August 1991 in “American Journal of Medical Genetics” This study observed that a low-protein, arginine-supplemented diet improved the abnormal hair appearance in untreated patients with argininosuccinic aciduria.
This chapter explores the causes and management of hair damage, highlighting effective repair strategies such as protein and lipid replenishment with keratin peptides and citric acid, and identifies social media's role in consumer preferences for protective and conditioning products.
July 2024 in “Brazilian Journal of Clinical Medicine and Review” This review found that hair loss is common in women after bariatric surgery, linked to nutritional deficiencies and rapid weight loss, highlighting the need for further research and nutrient monitoring.
May 2023 in “Elsevier eBooks” This source highlights the increasing use of nutritional supplements among patients with androgenetic alopecia, noting positive effects on hair thickness and density in controlled trials, while emphasizing the need for further research to understand their safety and efficacy.
114 citations
,
October 2009 in “Gastroenterology” This review discusses zinc's role as an essential trace element in human nutrition, particularly its importance in total parenteral nutrition, and reports no new clinical results.
48 citations
,
July 1993 in “The journal of investigative dermatology/Journal of investigative dermatology” This article reviews the genetic and protein interactions involved in hair growth, highlighting regulatory sequences, expression patterns, and potential genetic modifications, but presents no new experimental findings.
10 citations
,
May 2019 in “International Journal of Environmental Research and Public Health” This study found that finasteride treatment in male rats altered steroid hormone homeostasis and caused kidney damage, suggesting potential risks for patients with renal dysfunction on androgen or antiandrogen therapy.
37 citations
,
June 2018 in “Clinical and Experimental Medicine” This study found that patients with alopecia areata had significant systemic inflammation and vitamin D deficiency, with both conditions more pronounced as disease severity increased.
4 citations
,
October 2024 in “Journal of Cosmetic Dermatology” This study found that taking oral FKH supplements for 90 days improved facial skin, hair, and nail appearance, and highlighted the role of free L-amino acids as potentially beneficial beyond their protein-building functions.
1 citations
,
March 2020 in “Functional foods in health and disease/Journal of functional foods in health & disease” This study found that OM-X® supplementation effectively prevented adverse biological changes caused by vitamin C deficiency in SMP30/GNL KO mice, improving energy maintenance, antioxidant capacity, and protein synthesis.
October 2022 in “Research, Society and Development” This review highlights that while vitamin and mineral supplementation shows limited impact on hair loss treatment, deficiencies in iron, zinc, and vitamin D are common among patients with telogen effluvium.
January 2015 in “Journal of Nutrition and Health” This study found that fish oil supplementation in male Wistar albino rats helped maintain hair shaft structure and improved amino acid composition, while reducing harmful protein compounds associated with diabetes and hypercholesterolemia.
October 2025 in “Jurnal Ilmiah Kedokteran dan Kesehatan” This literature review reports that multivitamin supplementation can enhance hair density and quality in people with suboptimal nutritional status but warns that excessive intake of certain vitamins and minerals may cause hair loss.
6 citations
,
October 2015 in “Experimental dermatology” This study found that adenine supplementation in cultured human follicle dermal papilla cells stimulated proliferation and reduced senescence, possibly through AMPK activation and increased cellular NAD+ levels.