Well also look at how its measurement can give you insights into health, including your methylation cycle
Published studies report average onset times (typically 3045 minutes), but individual variability means your personal timeline may fall anywhere within the 2060 minute range depending on metabolic rate, choline status, and receptor density
If a dose is missed, consult your provider for guidance
Both the doctor and the PA, are patient, informative, and really take the time to listen to our concerns and issues
PMID 11368417
According to our knowledge, there are not such precise investigations with stable isotopes conducted for the other B-vitamins, however a cross-sectional study in age matched (non-supplement users) pregnant, lactating and non-pregnant women with B-vitamin intake within the recommended levels, did not find significant differences among the three groups of women in the 24-hour urinary excretion of vitamin B 6 , riboflavin and vitamin B 12 (Reference Shibata, Fukuwatari and Sasaki33)