May 2026 in “Applied Biochemistry and Biotechnology” Lemon-derived vesicles may help hair grow.
May 2025 in “Insights-Journal of Health and Rehabilitation” This study found that Aloe vera and Citrus lemon extracts demonstrated notable antibacterial effects against Propionibacterium acnes in both lab and human skin models, with combined use resulting in a 67% reduction in acne, suggesting potential for future therapeutic applications.
December 2024 in “Globus: an international journal of medical science, engineering and technology.” This study found that 10% Citrus aurantium peel oil significantly promoted hair growth in ICR mice by reducing the time needed for hair growth initiation and completion, and by increasing hair length, follicle diameter, and count, showing potential as a hair growth agent.
September 2023 in “Cumhuriyet science journal” This study investigated the antioxidant capacities of essential oils from myrtle and orange commonly used in the Adana region and found that myrtle essential oil exhibited a higher antioxidant activity than orange essential oil when tested with the DPPH assay.
September 2023 in “Jurnal MIPA (edisi elektronik)” This study formulated and evaluated the physical stability of hair tonic preparations using lime extract (Citrus aurantifolia) at varying concentrations. The researchers found that the tonics exhibited good physical stability, as indicated by meeting Indonesian National Standards, even after undergoing temperature cycling tests.
September 2022 in “Tạp chí Y Dược học Cần Thơ” This study found that using grapefruit essential oil improved hair growth and length in a shaved white mice model compared to controls.
125 citations
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February 1971 in “Biochemistry” Specific cross-linkages help make hair proteins stable and strong.
88 citations
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July 1958 in “Nature” This study reported the first known occurrence of citrulline in an animal protein, specifically in the fibrous protein of hair follicle inner root sheaths.
62 citations
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December 2007 in “Journal of biological chemistry/The Journal of biological chemistry” 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.
46 citations
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November 1963 in “Journal of Histochemistry & Cytochemistry” In this study, researchers localized arginine and citrulline in rat hair follicles and found that arginine is abundant in trichohyalin droplets, while citrulline predominantly accumulates in the hardened inner sheath and medulla.
45 citations
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January 1977 in “Advances in experimental medicine and biology” Hair follicles have an enzyme that converts arginine to citrulline in proteins.
28 citations
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January 1985 in “Journal of the American Academy of Dermatology” This report presents a case of pili torti in a young girl with citrullinemia, a novel association not previously documented.
21 citations
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November 2019 in “Molecular & Cellular Proteomics” This study found that citrullinated proteins, which are implicated in rheumatoid arthritis, were abundant in outer membrane vesicles from Porphyromonas gingivalis but nearly absent in mutants, validating their approach to citrullinated peptide identification.
21 citations
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September 1968 in “Cancer” This study identified that keratotic basal cell carcinomas with citrulline-positive keratin and hair papilla-like structures are highly differentiated, which helps distinguish them from squamous carcinomas.
20 citations
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February 1968 in “Journal of Histochemistry & Cytochemistry” This study reports that citrulline, uniquely found in the inner root sheath of hair follicles, can be specifically detected with the carbamido diacetyl reaction, resulting in a bright orange color.
5 citations
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January 2021 in “Pakistan Journal of Nematology” This review discusses the potential of Citrullus colocynthis as a natural nematicidal agent and highlights its phytochemical composition, but reports no new experimental results.
5 citations
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September 2009 in “Journal of Complementary and Integrative Medicine” This study found that the petroleum ether extract of Citrullus colocynthis fruit and an isolated steroidal compound may reduce prostatic hyperplasia in rats induced by testosterone, suggesting potential use in managing androgen-dependent conditions.
5 citations
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January 2007 This study found that topical application of Citrullus colocynthis extracts reduced hair growth initiation and completion times in albino rats and resulted in similar hair follicle anagen phase activation as minoxidil.
4 citations
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January 2020 3 citations
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April 2015 in “Current problems in dermatology” 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.
1 citations
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January 2020 in “Indo global journal of pharmaceutical sciences” This article reviews the traditional uses of Citrullus colocynthis for various conditions like cancer and jaundice but reports no new clinical results, underscoring its role in folk medicine.
September 2025 in “Science Advances” 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.
May 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that baricitinib can counteract the cytokine-driven reduction of the enzyme PADI1 in human keratinocytes, which may help improve skin barrier function in atopic dermatitis by enabling epidermal differentiation.
January 2019 in “Journal of Pharmacognosy and Phytochemistry” This study identified 14 different phytoconstituents in the methanolic fruit extract of Citrullus colocynthis, suggesting its potential pharmacological importance.
4 citations
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January 2017 in “Biological & pharmaceutical bulletin” This study found that inhibiting arachidonate 12-lipoxygenase (ALOX12) may enhance hair cuticle maturation by increasing S100A3 protein citrullination and promoting cuticular differentiation in isolated human hair follicles.
This study found that Ca²⁺ signaling and peptidylarginine deiminase enzymes play a crucial role in activating neural stem cells in response to injury in zebrafish, suggesting potential therapeutic targets for CNS injuries and cancer.
10 citations
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January 2022 in “Traditional and Integrative Medicine” This study observed that Citrus limon essential oil demonstrated significant anticancer activity against an MCF-7 breast cancer cell line, suggesting its potential as a complementary cancer treatment.
138 citations
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November 1977 in “Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics” 5 citations
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September 2013 August 2024 in “Scientia Horticulturae” In this study, researchers observed that inoculation with Funneliformis mosseae significantly enhanced growth, biomass, and root architecture in trifoliate orange plants, with variations in auxin levels and gene expression, suggesting PtPIN6 as a key gene involved in root hair development regulation.