47 citations
,
September 2002 in “Journal of Bone and Mineral Research” This study found that a specific VDR amino acid substitution in children with hereditary vitamin D-resistant rickets disrupts ligand binding and gene activation but does not impair hair follicle development.
20 citations
,
February 1991 in “Archives of dermatology” In this study, researchers found that high-dose tryptophan ingestion before symptom onset may be linked to clinical features resembling eosinophilia-myalgia syndrome in patients with eosinophilic fasciitis.
16 citations
,
August 2000 in “Il Farmaco” This study observed that tryptophan levels in human hair are higher in males than females, increase with age, and vary with hair color, being highest in grey and white hair.
4 citations
,
July 2024 in “Biomolecules” This review suggests systemic changes in polycystic ovary syndrome may increase the risk of neurodegeneration, potentially linking it to Alzheimer's disease through common pathways affecting tryptophan metabolism.
33 citations
,
August 1993 in “FEBS Letters” This study identified a new enzyme, skin l‐tryptophan‐2,3‐dioxygenase, that may play a role in rat hair growth regulation, showing increased activity during peak hair growth periods.