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This study found that various reduced folates effectively penetrated an in vitro skin model, promoted cell proliferation and migration, and may enhance wound healing, suggesting potential for topical treatment in skin conditions.

This study found that cortisone reductase deficiency is caused by inactivating mutations in the H6PD gene, affecting cortisol metabolism by preventing 11β-HSD1 enzyme function.

This study suggests that daughters of women with PCOS may have altered androgen metabolism in early childhood, with increased 5α-reductase activity potentially contributing to PCOS development.

This review discusses the potential health benefits of L-Cysteine, noting increased research interest but highlighting a lack of clinical trial data for consensus on its effectiveness.

This study found that oral administration of l-cystine with vitamin B6 effectively prevents environmental cigarette smoke-induced alopecia in mice by reducing hair bulb cell apoptosis.

This study observed that fibrin rich in leukocytes and platelets (L-PRF) might effectively heal diabetic foot ulcers with osteomyelitis, showing positive preliminary results in all three patients treated.

In this study, l-Ascorbic acid 2-phosphate was found to stimulate hair follicle growth in vitro by promoting IGF-1 expression via the PI3K pathway.

This study identified a new enzyme, skin l‐tryptophan‐2,3‐dioxygenase, that may play a role in rat hair growth regulation, showing increased activity during peak hair growth periods.

In this study, L-threonate was found to inhibit DHT-induced DKK-1 expression in cultured dermal papilla cells, suggesting it could help prevent androgen-driven balding.

In this study, researchers found that L-cysteine interacted electrostatically with anionic ions on the surface of keratin fibers in human hair, reducing the rate of disulfide bond disconnection at pH 9.0.

This study found that both finasteride and dutasteride significantly reduced L-DOPA-induced dyskinesia in a rat model of Parkinson's disease, with dutasteride showing greater effectiveness at lower doses.

This study found that l-carnitine stimulated hair growth in vitro by promoting proliferation and reducing apoptosis in human scalp hair follicles, suggesting potential as a treatment for hair loss.

This study reports that six women developed scleroderma while taking L-tryptophan and showed improvement after stopping the supplement and/or starting corticosteroid therapy.

In this study, low-dose BPA was associated with induced prostatic hyperplasia in rats, potentially mediated by COX-2 and L-PGDS through pathways involving cell proliferation and apoptosis.

This study found that PES1CMU-defatted rice bran (DFRB) showed effective skin whitening and anti-aging properties comparable to standard treatments in cell models, suggesting its potential use in dermatocosmetics.

This study observed that repeated perm treatments decrease disulfide bonds in hair due to their conversion largely into cysteic acid, affecting the waving efficiency depending on the reduction agent used.

This study concluded that high-dose oral therapy with L-cystine, gelatin, and vitamin A significantly improved hair growth indicators in patients with diffuse hair loss, with no systemic side effects observed.

This review discusses the clinical significance of L-Lysine in treating various conditions and reports mixed findings on its effectiveness against herpes simplex virus infections, with no new experimental results presented.

This study observed a higher incidence of telogen effluvium from July to October, suggesting a summer-related effect in populations above the Tropic of Cancer, possibly influenced by ultraviolet light.

This study found that hydrophobic amino acids from egg white hydrolyzed protein and L-phenylalanine effectively penetrate deep into the human hair fiber, increasing specific contents in both virgin and bleached hair.

This study demonstrated that high doses of L-cystine and vitamin B6 effectively prevent doxorubicin-induced hair loss in mice.

This case report describes a patient with eosinophilia-myalgia syndrome, likely linked to L-tryptophan use, who developed a skin rash characterized by cutaneous mucinosis.

This review emphasizes the potential of repurposing topical L-thyroxine for skin ulcers and telogen effluvium and highlights the need for further exploration of its use in dermatology.

This study found distinct differences in UEA I glycoprotein binding on follicular keratinocytes between anagen and telogen hair follicles, with staining associated with follicle length and regrowth.

In this study, a mixture of tocopherol acetate, L-menthol, and stevioside was more effective in promoting hair growth in mice compared to tocopherol acetate or L-menthol alone.

Mink use L-methionine and L-cystine slightly better than natural amino acids for hair growth, but D-methionine is not effective.

Treatment with oral terbinafine and topical enilconazole was successful in resolving a Trichophyton dermatophytosis outbreak in L'Hoest's monkeys, with complete mycological cure achieved after eight weeks.

In this study, EPC-K, a compound with antioxidant and moisturizing effects, was found to decompose significantly under certain conditions, impacting its stability in quasi drug hair-growing products.