Mutations in the vitamin D receptor have been found to at least partially account for some of the variability in vitamin D levels observed in patients with obstructive sleep apnea
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Communication barriers, longer shipping times, limited recourse for quality issues, and variable quality control standards all factor into the equation
J Int Soc Sports Nutr 7 , 35 (2010)
Hayden MR, Grant DG, Aroor AR, DeMarco VG
While the body can synthesise small amounts of L-Carnitine from the amino acids lysine and methionine, this endogenous production may not always be sufficient especially for active individuals with higher energy demands