Cell membranes, acetylcholine, liver fat export and methyl-group metabolism.
Needs depend on age, sex and life stage; not listed separately in the Swiss tool.
Eggs, liver, meat, fish, soybeans, kidney beans and some cruciferous vegetables.
Rare; experimental deficiency or artificial nutrition can cause fatty liver and muscle damage.
Pregnancy increases its developmental importance; genetics affects individual needs.
No specific hair or nail signs.
Parenteral nutrition, very restricted diets, pregnancy and certain genetic variants.
Consider diet and clinical liver/muscle context; no usual single test.
Food first; discuss pregnancy individually with a professional.
High doses can cause fishy body odour, sweating, low blood pressure and gastrointestinal symptoms.