March 2016 in “The Korean Society of Beauty and Art” This study found that using a hair-hardener improved hair thickness, amino acid content, surface condition, tensile strength, and wave efficiency without causing any allergic reactions in participants.
25 citations
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December 2005 in “Molecular Genetics and Metabolism” This study reports that riboflavin may increase enzymatic activity in a GCDH-deficient patient with specific mutations, but doesn't fully normalize urinary organic acid levels.
January 2026 in “Cirugía Plástica .” This study reviewed preclinical evidence suggesting that topical glutamic acid can enhance hair regrowth and skin healing in burn-induced alopecia, highlighting its potential as a simple, low-cost treatment option that warrants further clinical trials.
12 citations
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July 2021 in “Scientific Reports” This study found that exogenous glutamic acid can promote hair growth and keratinocyte proliferation, suggesting a novel signalling pathway in the skin.
22 citations
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October 2019 in “International Journal of Nanomedicine” This study suggests that the hydrogel nanoparticle formulation of hair growth-promoting compounds may enhance hair follicle penetration and induce hair growth in tested models, demonstrating its potential as a hair growth treatment.