Hair can't be as strong as Rapunzel's because it's impractical to scale up due to defects.
May 2004 in “Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease” Vitamin E affects liver metabolism, enhancing stress resistance, reducing blood clotting, and altering hormone processing.
73 citations
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October 2013 in “International Journal of Cosmetic Science” Chemical hair straightening can damage hair and health, needing safer alternatives and stricter regulations.
12 citations
,
January 2020 in “Analyst” Researchers found markers that can tell if hair has been bleached, which could improve hair test accuracy.
53 citations
,
November 2021 in “Molecular Human Reproduction” N-acetylcysteine may help treat uterine and placental issues in PCOS.
14 citations
,
November 2024 in “International Journal of Molecular Sciences” YAP and TAZ proteins control skin cell growth and repair.
16 citations
,
October 2021 in “Trends in biotechnology” Future hair products will use ecofriendly proteins and peptides to improve hair health and appearance.
15 citations
,
January 2017 in “Pigment International” Early hair graying is often inherited and influenced by genetics, environment, and lifestyle, but treatment options are limited.
1 citations
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April 2023 in “Biomolecules” Fermented papaya and mangosteen in hair care products helped prevent hair loss and improve hair thickness.
November 2025 in “Archaeometry” Animal hair from 18th-century Mazamet burial sites shows locals used goat, badger, cow, or horse fur for clothing, indicating modest economic status.
16 citations
,
August 1989 in “PubMed” Retinol and L-cystine improve diffuse hair loss without side effects.
9 citations
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September 2018 in “Journal of Photochemistry and Photobiology B-biology” A hair-growth formula with cystine and thiamin helps protect skin cells against UV damage and improves their growth.
9 citations
,
January 2006 in “Cutaneous and ocular toxicology” L-cystine, D-pantothenat, and miliacin together significantly boost keratinocyte growth and metabolism.
9 citations
,
June 1947 in “Analytical Chemistry” Cold waving solutions quickly reduce cystine to cysteine in hair.
9 citations
,
August 2007 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” Sheep wool follicles absorb different amino acids at various rates and locations, which could affect wool growth based on diet and genetics.
7 citations
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January 1982 in “Acta agriculturae Scandinavica” Mink use L-methionine and L-cystine slightly better than natural amino acids for hair growth, but D-methionine is not effective.
May 2026 in “Preprints.org” The nutrient combination improved hair condition and was safe for women with diffuse hair loss.
GV-350 improves hair growth and quality of life in iron-deficient women without side effects.
Prussian Blue causes hair cuticles to detach, weakening the hair.
January 2015 in “Zurich Open Repository and Archive (University of Zurich)” The supplement did not work better than a placebo for hair loss in women over 60.
28 citations
,
October 2011 in “International Journal of Molecular Medicine” Adenosine helps hair grow longer and stronger by boosting certain growth factors and signaling pathways.
26 citations
,
March 1995 in “Differentiation” A rabbit gene important for hair development was identified and detailed.
11 citations
,
January 1997 in “Journal of Dermatological Science” A new protein linked to hair strength was identified, aiding in understanding brittle hair conditions.
1 citations
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July 2022 in “Clinical and Experimental Dermatology” Amino acid supplements may not be necessary for all women with chronic hair loss.
1 citations
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January 1992 in “DNA sequence” Researchers found a non-functional sheep keratin gene due to mutations.
February 2025 in “Clinical & Experimental Dermatology and Therapies” Combining supplements with minoxidil improves hair growth more than minoxidil alone.
August 2022 in “Clinical and Experimental Dermatology” Amino acid supplements may not be necessary for all women with chronic hair loss.
March 1990 in “Journal of Dermatological Science”
3 citations
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January 2017 in “Journal of cosmetology & trichology” The food supplement with L-cystine, Serenoa repens extract, and biotin safely reduced hair loss and improved hair growth in men and women.
September 2024 in “Journal of the American Academy of Dermatology” The supplements improved hair density and reduced hair loss.