Unfortunately, because of the lipid groups incorporated into phosphatidylcholine, its molecular weight is high and reasonable doses require consuming several large capsules a day. The study represents the first attempt to determine if betaine, an alternative compound within the same metabolic pathway but with a much lower molecular weight, also increases serum choline levels. As the first step, this proposal seeks to address this in non-pregnant women. Specifically, the goals are to (a) assess whether changes in serum choline levels in response to molar equivalent supplementation of phosphatidylcholine versus betaine are similar, and (b) whether, for betaine, there is a dose response relationship between supplementation dose and serum choline levels.