BetaineLipotropic AgentsSarcosineCholineBetaine-Homocysteine S-MethyltransferaseOsmotic PressureWater-Electrolyte BalanceProlineOsmolar ConcentrationSodium ChlorideHomocysteineMethionineMolecular StructureHomocystinuriaSulfur CompoundsSulfonium CompoundsVolatile Organic CompoundsAmino Acids, DiaminoMagnetic Resonance SpectroscopyStructure-Activity Relationship