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doi: 10.1038/1831324b0
There are complexities in ascribing what is a normal physiological range, something discussed in detail in Testosterone Reference Ranges What Should Be Considered Normal & Why?

Folate losses in ultra-heat treated milk packed in Tetra Pak stored at 24 C amounted to 11% and 32% after 12 and 20 weeks, respectively 463

Associations of Genetic Determinants of Serum Vitamin B12 and Folate Concentrations with Hay Fever and Asthma: A Mendelian Randomization Meta-Analysis

Rocca et al., 2018)

Administration of a bolus, usually a drink, containing large neutral amino acids (LNAA), but lacking tryptophan, limits the transport of endogenous tryptophan across the blood-brain barrier through competition with other LNAAs undergoing active transport
