The recommended dietary intake target for choline is approximately 550 mg per day for adults.
"so I'm getting around 550 mg per day, which is the the goal for most of us." (said at 1:05:38)
Dietary guidelines set by the Institute of Medicine (now the National Academy of Medicine) established an Adequate Intake (AI) for choline of 550 mg/day specifically for adult men (as well as lactating females). For non-pregnant adult women, the AI is 425 mg/day (increasing to 450 mg/day in pregnancy). Therefore, 550 mg/day is the target for adult men rather than all adults in general.
- context: Choline: are our university students eating enough? (The West Indian medical journal 2006)
"The analysis revealed that 86.2% of the females and 90.9% of the males reported diets that delivered less daily choline than the adequate intake quoted by the Institute of Medicine of the National Academy of Sciences, USA (425-550 mg/day)." (abstract, results, passage verified)
pubmedfull study (doi) - context: Sex and menopausal status influence human dietary requirements for the nutrient choline. (The American journal of clinical nutrition 2007)
"Moreover, 6 men developed these signs while consuming 550 mg choline x 70 kg(-1) x d(-1), the AI for choline." (abstract, results, passage verified)
pubmedfull study (doi) - context: Pre- and postnatal health: evidence of increased choline needs. (Journal of the American Dietetic Association 2010)
"Although human beings' requirement for choline is unknown, an Adequate Intake level of 425 mg/day was established for women with upward adjustments to 450 and 550 mg/day during pregnancy and lactation, respectively." (abstract, background, passage verified)
pubmedfull study (doi)