Choline胆碱

Vitamin-like essential nutrient

Stop 1/5

维生素样必需营养素

Choline isn't a traditional vitamin (it doesn't meet the strict 'humans cannot synthesize it at all' definition), but it is an essential nutrient.

Endogenous synthesis: the liver can methylate phosphatidylethanolamine in three steps to phosphatidylcholine via the PEMT pathway (phosphatidylethanolamine N-methyltransferase). The required methyl donor is — the product of the folate / B12 methylation cycle.

Why it's still essential: PEMT synthesis isn't enough for most people's needs, especially during high-demand windows (pregnancy, lactation, growth). Men and post-menopausal women have somewhat stronger synthesis capacity; pregnancy estrogen upregulates PEMT, but dietary intake is still required.

AI (adequate intake): men 550 mg/day, women 425 mg/day, pregnancy 450 mg/day, lactation 550 mg/day.

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本站提供科普与一般性建议，不替代医师诊断或处方；有症状或正在服药请咨询合格医师。 Educational content, not medical advice — consult a clinician for diagnosis or treatment.

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Choline胆碱

Vitamin-like essential nutrient

Stop 1/5

维生素样必需营养素

Choline isn't a traditional vitamin (it doesn't meet the strict 'humans cannot synthesize it at all' definition), but it is an essential nutrient.

Endogenous synthesis: the liver can methylate phosphatidylethanolamine in three steps to phosphatidylcholine via the PEMT pathway (phosphatidylethanolamine N-methyltransferase). The required methyl donor is — the product of the folate / B12 methylation cycle.

Why it's still essential: PEMT synthesis isn't enough for most people's needs, especially during high-demand windows (pregnancy, lactation, growth). Men and post-menopausal women have somewhat stronger synthesis capacity; pregnancy estrogen upregulates PEMT, but dietary intake is still required.

AI (adequate intake): men 550 mg/day, women 425 mg/day, pregnancy 450 mg/day, lactation 550 mg/day.

Read story

本站提供科普与一般性建议，不替代医师诊断或处方；有症状或正在服药请咨询合格医师。 Educational content, not medical advice — consult a clinician for diagnosis or treatment.