August 2025 in “Frontiers in Nutrition” This study found that serum amino acid profiles changed significantly following laparoscopic sleeve gastrectomy in patients with obesity, and identified serum leucine levels as an independent risk factor for postoperative alopecia.
2 citations
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October 2023 in “Animals” Lacto-fermentation changes amino acid profiles in bovine colostrum, but results are inconsistent.
11 citations
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November 1966 in “Experimental Biology and Medicine” This study suggests hair diameter may indicate protein status in children if the sampling location on the head is controlled, noting inconsistencies in past research.
2 citations
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January 1981 High temperatures and certain chemicals can significantly change the amino acid content in human hair.
15 citations
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January 1981 in “Neonatology” This study observed that changes in amino acid levels in milk correlate with developmental events in pouch young marsupials, notably around hair follicle development and homeothermy onset.