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This review investigates how various intrinsic factors—such as growth factors, cytokines, chemokines, and interferons—regulate hair growth through evidence gathered from in vitro and in vivo studies, highlighting the need for further research in human subjects to validate these findings.

This study examined proteomic changes in Inner Mongolia cashmere goat skin, finding 631 proteins differentially regulated during hair growth stages; key keratin proteins, crucial for hair follicle development, were localized in secondary hair follicles.

This study found that the methanolic heartwood extract of Avicennia marina significantly inhibited the enzyme 5 alpha-reductase type 1 in a cell-based assay, suggesting potential anti-androgenic effects for treating androgenic alopecia.

This study found that human follicle dermal papilla cells promote survival, proliferation, and tubulogenesis of microvascular endothelial cells, highlighting their significant role in hair follicle vascular remodeling.

This study found that human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) significantly prevented hair loss induced by dexamethasone in a mouse model and enhanced cell proliferation in human hair follicle cells, suggesting a protective effect against stress-related hair loss.

This review examines how hormonal, vascular, and neuropeptide factors may regulate hair growth, suggesting a combined approach could contribute to developing new treatments for hair loss; it reports no new clinical results.

This study found that 6-Gingerol significantly suppressed hair growth in mice by reducing hair follicle number and length, potentially through increased expression of MMP2 and MMP9.

This article discusses the concept of telogen effluvium, introduced in 1961, characterized by diffuse scalp hair loss due to various triggers, and reports no new clinical findings.

In this study, fish-derived collagen hydrolysate from tilapia scales improved hair growth and skin health in both cellular and mouse models, reducing oxidative stress and inflammation while enhancing hair quality and promoting beneficial gene expression.

This study found that de-saponinated Camellia seed cake extract promotes hair growth in vitro and in vivo by enhancing dermal papilla cell proliferation and modulating signaling pathways and growth factor expression.

Yonnyuniksoogobon-dan taken orally promotes hair growth by affecting growth factors in hair roots.

This study identified a crucial Gli2-Serpinh1 regulatory axis that regulates fibroblast state transitions during skin wound healing, shedding light on fibroblast heterogeneity and suggesting potential precision regenerative therapies.

This systematic review found that mangkokan leaf formulations, especially ethosomal gel or phytosome lotion at 25% concentration, were most effective in stimulating hair growth and improving hair health through various biological mechanisms.

This study found that a silk fibroin/sodium alginate scaffold effectively delivers human umbilical mesenchymal stem cells to promote scarless wound healing and hair follicle regeneration in vivo by inducing specific cellular processes and mitigating endoplasmic reticulum stress.

This study identified melatonin as a potential treatment for rosacea and Alzheimer's disease, suggesting it may help by modulating inflammatory and vascular signaling pathways.

This study found that NDRG1 expression increases during the proliferation of infantile hemangioma and may positively regulate its growth, while FOXO1 downregulation plays a role in its pathogenesis.

This study found that Chrysanthemum zawadskii extract may promote hair growth by inducing an earlier conversion of telogen to anagen and increasing the proliferation of dermal papilla cells in mice and human hair follicle cultures.

This study found that using a 0.5mm roller for microneedle therapy increased hair growth in mice and significantly affected the expression of hair growth-related molecules like VEGF.

This article reviews the development of a topical hair growth agent using natural extracts and reports no new clinical results, emphasizing the need for further evaluation of its efficacy.

This hypothesis paper suggests that sexual and cognitive dysfunctions reported by some men after using finasteride and dutasteride may stem from vascular and tissue changes in penile tissue triggering broader inflammatory effects.

This study reported that exposure to melatonin promoted hair follicle fiber growth in an in vitro Cashmere goat model, potentially by influencing pathways related to the extracellular matrix and microvascular system.

In this study, melatonin exposure promoted hair follicle fiber growth in Cashmere goats, suggesting that it may mediate hair follicle development through long non-coding RNAs affecting vascular and extracellular pathways.

This review discusses how androgens and cytokines may interact in androgenetic alopecia and reports no new results; the authors note the need for further research.

This study suggests that interleukin-1 α influences dermal papilla cell activity by modifying androgen receptor expression and increasing the secretion of several growth factors and cytokines.

In this study, a botanical extract and minoxidil showed similar effects in vitro by reducing pro-inflammatory cytokines and 5α-reductase expression while increasing growth factors VEGF and KGF in human keratinocyte cells, suggesting potential for further in vivo research.

Hair follicle stem cells rely on nearby blood vessels for their maintenance and function.

This narrative review examines advancements in regenerative aesthetic medicine, focusing on injectable modalities like PRP, polynucleotides, and exosomes, but highlights the need for more robust evidence and standardization in clinical applications.

This research reported that melatonin may serve as a potential treatment for both rosacea and Alzheimer's disease by regulating inflammation and vascular signaling pathways, demonstrating effectiveness in reducing symptoms associated with rosacea-like skin lesions in experimental settings.

This study found that γδ T cells play a role in regulating stromal behavior, influencing the composition and vascularity of fibrotic tissues during the foreign body response.

This review outlines the structure and functions of the skin, emphasizing its role as a physical and immune barrier, its moisture regulation, the influence of its microbiome, and the supportive functions of its layers and adnexa.