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J Nutr. 2016 Dec;146(12):2652S-2654S. Epub 2016 Nov 9.

Proposals for Upper Limits of Safe Intake for Arginine and Tryptophan in Young Adults and an Upper Limit of Safe Intake for Leucine in the Elderly.

Author information

1
Clinical Chemistry Laboratory, Cochin Hospital, AP-HP, Paris, France; luc.cynober@aphp.fr.
2
Biological Nutrition Laboratory and.
3
EA 4466, Faculty of Pharmacy, Paris Descartes University, Paris, France.
4
Scientific Advisory Committee of the International Council on Amino Acid Science.
5
USDA Agricultural Research Service, Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX.
6
Graduate School of Science and Technology, Niigata University, Niigata, Japan.
7
University of Pittsburgh School of Medicine, Pittsburgh, PA.
8
Department of Pediatrics, School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada; and.
9
International Council on Amino Acid Science, Brussels, Belgium.

Abstract

On the basis of research presented during the 9th Amino Acid Assessment Workshop, a No Observed Adverse Effect Level (NOAEL) for diet-added arginine (added mostly in the form of dietary supplements) of 30 g/d and an upper limit of safe intake (ULSI) for diet-added tryptophan (added mostly in the form of dietary supplements) of 4.5 g/d have been proposed. Both recommendations apply to healthy young adults. The total dietary leucine ULSI proposed for elderly individuals is 500 mg · kg-1 · d-1 All 3 recommendations are relevant only to high-quality amino acid-containing products with specifications corresponding to those listed in the US Pharmacopeia Because the above amino acids are extensively utilized as dietary supplements for various real or perceived benefits, such as vasodilation, spermatogenesis, sleep, mood regulation, or muscle recovery, the above safety recommendations will have an important impact on regulatory and nutritional practices.

KEYWORDS:

NOAEL; arginine; leucine; safe intake; tryptophan

PMID:
27934658
DOI:
10.3945/jn.115.228478
[Indexed for MEDLINE]
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