July 2024 in “Journal of Investigative Dermatology” PP405 may help hair growth by activating hair follicle stem cells.
Polyglutamic acid is a valuable, sustainable ingredient for skincare and haircare products.
138 citations
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November 2015 in “Journal of Pharmacology and Experimental Therapeutics” Protoporphyrin IX is useful in cancer treatment but can cause health problems if not properly regulated.
April 2021 in “Research Square (Research Square)” The new cocrystal KET-PABA is a more effective and safe anti-inflammatory treatment for skin conditions in mice.
62 citations
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December 1941 in “Experimental biology and medicine” Eating phenylthiocarbamide made all the rats' hair go gray, but some returned to their original color after stopping.
13 citations
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December 1977 in “Journal of Toxicology and Environmental Health” High levels of phenyl glycidyl ether vapor caused hair loss in rats.
4 citations
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January 1994 in “Yakugaku zasshi” EPC-K is stable except at very acidic pH or when exposed to sunlight, and it can decompose in low ethanol concentrations.
16 citations
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September 2018 in “Journal of Molecular Liquids” The PS-b-PAA copolymer nanomicelles are effective for delivering a cancer treatment drug in photodynamic therapy.
February 2025 in “International Journal of Cosmetic Science” Protein carbonylation is a sensitive marker for oxidative damage in hair, especially from light exposure.
4 citations
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January 2023 in “bioRxiv (Cold Spring Harbor Laboratory)” PrrH sRNA controls pyochelin gene expression in Pseudomonas aeruginosa based on heme levels.
253 citations
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April 2009 in “Journal of Biological Chemistry” p2y5, now called LPA6, is a receptor important for human hair growth.
7 citations
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May 2016 in “European Polymer Journal” The new nanocarriers improve how well water-insoluble drugs dissolve and allow for controlled drug release.
51 citations
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January 2007 in “The journal of investigative dermatology/Journal of investigative dermatology” Scientists discovered a unique hair protein, KAP24.1, with a special structure, found only in the upper part of hair cuticles.
2 citations
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September 1980 in “Experientia” Polyethylene alanine caused hair loss in young lab animals but not in adults, with hair regrowth occurring within 20 days.
January 2024 in “International Journal of Advanced Research” Topical 6% salicylic acid effectively reduced skin plaques in a patient with wooly hair and palmoplantar keratoderma.
January 2026 in “Frontiers in Medicine” PP-PTKL may help treat hair greying, but more testing is needed.
8 citations
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September 2021 in “EMBO Molecular Medicine” A new small peptide may help hair growth by activating a specific receptor and should be tested in humans.
January 2026 in “Molecules” A new perming method is less damaging to hair and works as well as traditional methods.
April 2016 in “Journal of Investigative Dermatology” A peptide known for reducing wrinkles also effectively inhibits an enzyme linked to skin inflammation and acne.
5 citations
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April 2005 in “Journal of applied polymer science” PEI diffuses into hair at a constant rate, and urea speeds up this process.
4 citations
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November 1968 in “Textile research journal” Hair fibers may have a unique, non-protein sheath not previously identified.
2 citations
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January 2020 in “BioMed Research International” Phaeodactylum tricornutum extract helps hair follicle cells grow by activating the ERK1/2 pathway.
August 2024 in “Biomolecules & Therapeutics” A new compound, HTPI, promotes hair growth by protecting cells from damage and regulating energy use.
November 2025 in “JDDG Journal der Deutschen Dermatologischen Gesellschaft” Restoring phenylalanine levels improved skin and hair symptoms in a PKU infant.
11 citations
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January 2016 in “International Journal of Biological Macromolecules” Enzymatic phosphorylation of hair keratin improves the effectiveness of hair products with cationic ingredients.
5 citations
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January 2004 in “Journal of applied polymer science” Urea helps hair dye penetrate better and last longer.
March 2026 in “Indian Dermatology Online Journal” Hair dye ingredient PPD can cause severe allergic reactions, including facial swelling.
5 citations
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February 1998 in “Polymer” Human hair keratin has a 40% α-helix structure that changes to a random coil in 8 M urea.
3 citations
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May 2019 in “Journal of Cosmetic Dermatology” Pro-Ile could be used in cosmetics to improve skin, hair growth, and healing.
April 1996 in “Journal of Dermatological Science”