Betaine intake measurement

The three-year reliability of reported dietary intake was similar for betaine and related nutrients, in the range as that published in the literature for other micronutrients. The mean intake of betaine was estimated at 106 mg/d.

Bidulescu et al (2009). "Repeatability and measurement error in the assessment of choline and betaine dietary intake: the Atherosclerosis Risk in Communities (ARIC) Study." Nutrition Journal 8(1): 14.