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This study found that a specific amino-pyridine compound showed potent androgen receptor antagonist activity, stimulating hair growth in mice and reducing sebum production in a hamster model.

This study identified that spermidine-mediated activation of eIF5A by hypusination plays a significant role in Arabidopsis thaliana growth, flowering time, stress adaptation, and development, including changing root and aerial architecture.

In this animal study, agmatine exhibited a protective effect against seizures related to hormone fluctuations, with results suggesting that its anticonvulsant properties may involve interactions with central neurosteroids in female rats experiencing progesterone withdrawal.

This study found that adding urea to a polyethyleneimine solution improved the coloring ability and color fastness of low-temperature hair dyeing with acid dye by enhancing dye penetration into the hair.

This review discusses recent advances in polydopamine-based biomaterials and their growing potential in personalized medicine, but reports no new experimental results; the authors highlight both opportunities and challenges for future applications.

This study developed a quercetin-encapsulated and polydopamine-integrated nanosystem that reshapes the perifollicular microenvironment, showing potential for rescuing hair follicle viability and regenerating hair follicles in androgenic alopecia by scavenging reactive oxygen species and promoting angiogenesis.

This study focuses on improving the detection and characterization of an enzyme in guinea pig hair follicles that converts arginine to citrulline, highlighting challenges with assay sensitivity and reproducibility.

This study reports that PADI4, an enzyme involved in posttranslational protein modifications, regulates progenitor cell transitions in hair follicle development by repressing transcription and interacting with translational and ribosomal processes.

Specific cross-linkages help make hair proteins stable and strong.

In this study, polydopamine emerged as a safe and effective alternative to traditional hair dyes like PPD for dyeing gray hair permanently, showing resistance to detergents and causing less toxicity and hair loss in mice.

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.

This opinion from the EFSA Panel concludes that the health claim regarding spermidine prolonging the anagen phase of the hair cycle does not meet regulatory criteria as it is related to disease treatment.

This study found that N‐AOHPA was particularly effective as a silicone emulsifier for improving the condition of damaged hair by preventing amino acid dissolution from bleached hair.

This review outlines how peptidyl arginine deiminases (PADIs) and protein citrullination are involved in hair follicle regeneration and inflammatory alopecia, but presents no new clinical findings.

In this study, researchers developed a polyphenol–amino acid nanozyme capable of controlled hydrogen peroxide delivery, which effectively activated hair follicles via oxidative stress in a mouse model, suggesting a potential non-pharmacological treatment for alopecia.

This study reported the first known occurrence of citrulline in an animal protein, specifically in the fibrous protein of hair follicle inner root sheaths.

This study discusses the effects of incorporating various amino acids in hair care products, noting improvements in hair surface properties and color retention when integrated with conditioners.

Hair follicles have an enzyme that converts arginine to citrulline in proteins.

Both amodimethicone and dimethicone copolyol amine are effective hair conditioners.

This study found that palmitoylethanolamide may stimulate allopregnanolone synthesis and reduce oxidative stress in astrocytes through PPAR-α activation, suggesting a neuroprotective role.

This study found that enzymatic conversion of Arg-51 in S100A3 protein to citrulline promotes homotetramer assembly, potentially increasing Ca²⁺ binding required for hair cuticular barrier formation.

This study observed that glycine inhibited root growth and stimulated root hair development in habanero pepper seedlings, with ethylene signaling suggested to mediate these effects.

This study found that cysteine and arginine are crucial for hair growth in hair follicles, with cysteine affecting hair fibre diameter and arginine involved in protein incorporation and energy metabolism.

Mice hair follicles take in the amino acid cystine.

This study synthesized and characterized new 2-hydroxypyrrolidine/piperidine derivatives using FeCl₃·6H₂O as a catalyst, but it reports no biological or clinical results.

This study observed that a low-protein, arginine-supplemented diet improved the abnormal hair appearance in untreated patients with argininosuccinic aciduria.

This study found that poly(adenosine diphosphate-ribose) synthesis in human skin varies by cell type and condition, with distinct patterns in psoriatic, cancerous, and normal tissues.

This review discusses the role of norepinephrine release and protein kinase C activation in the development of benign prostatic hypertrophy, suggesting potential targets for new therapies, but it reports no new clinical results.

This study found that in Arabidopsis, the MYB30-EIN3 module plays a role in adapting root hair development to phosphate deficiency, potentially enhancing phosphate uptake from soil.

0.1% piroctone olamine in hair tonics effectively treats dandruff.