47 citations
,
September 2002 in “Journal of Bone and Mineral Research” A mutation in the vitamin D receptor causes severe resistance to vitamin D, affecting bone health but not hair growth.
20 citations
,
February 1991 in “Archives of dermatology” High doses of tryptophan may cause eosinophilic fasciitis.
16 citations
,
August 2000 in “Il Farmaco” Men have more tryptophan in their hair than women, and it increases with age and is higher in darker and grey or white hair.
4 citations
,
July 2024 in “Biomolecules” Women with PCOS may have a higher risk of Alzheimer's disease.
33 citations
,
August 1993 in “FEBS Letters” A new enzyme in rats may help regulate hair growth.