BiomarkerOf L-proline betaine An amino acid betaine that is L-proline zwitterion in which both of the hydrogens attached to the nitrogen are replaced by methyl groups. proline betaine CHEBI:35280 HMDB04827 InChI=1S/C7H13NO2/c1-8(2)5-3-4-6(8)7(9)10/h6H,3-5H2,1-2H3/t6-/m0/s1 C10172 FOBI:030685 CMUNUTVVOOHQPW-LURJTMIESA-N 115244 Proline and derivatives citrus fruit food product