Thats how it was discovered that levels were getting intracellularly and increasing
Science 287(5456):12651269 Matsuoka Y, Vila M, Lincoln S, McCormack A, Picciano M, LaFrancois J, Yu X, Dickson D, Langston WJ, McGowan E, Farrer M, Hardy J, Duff K, Przedborski S, Di Monte DA (2001) Lack of nigral pathology in transgenic mice expressing human alpha- synuclein driven by the tyrosine hydroxylase promoter
[17] In a study of chickens subjected to neonatal hypophysectomy and subsequent maturation, epitalon promoted the recovery of the morphological structures of the thymus, [18] as well as the structure and function of the thyroid gland
[2] Some individuals with genetic or medical disorders (such as preterm infants) cannot make enough carnitine, requiring dietary supplementation