Threonine
Threonine is a normal dietary nutrient required for human metabolism. FDA has affirmed L-threonine as GRAS for use in infant formula.
What it is
Threonine is one of the nine essential amino acids, required from the diet for protein synthesis.
Used to fortify infant formulas, sports supplements, and medical foods; also added to animal feed.
Why it's flagged
- very high doses may cause GI upset
What regulators actually say
"Amino acids ... may be added to foods only for the following nutritional purposes: To significantly improve the biological quality of the total protein ... L-Threonine."
"Essential amino acids, including threonine, must be obtained from the diet because they cannot be synthesized by the human body."
Regulatory status
United States — FDA
GRAS as nutrient supplement (21 CFR 172.320)
European Union — EFSA
Permitted amino acid for nutritional purposes
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