l-carnitine now Foods 500 mg 30caps Now Foods - Acetyl-L-Carnitine 500

They assume 'close enough' is acceptable

Ember, J

(2022) 226:S928s944

polymers of ethylenically unsaturated monomers: N,N-dialkylaminoalkyl methacrylate, N,N-dialkylaminoalkyl acrylate, N,N-dialkylaminoalkyl acrylamide, N,N-dialkylaminoalkylmethacrylamide, methacylamidoalkyl trialkylammonium salts, acrylamidoalkylltrialkylamminium salts, vinylamine, vinyl imidazole, quaternized vinyl imidazole and diallyl dialkyl ammonium salts, polymers of: diallyl dimethyl ammonium salt, N,N-dimethyl aminoethyl acrylate, N,N-dimethyl amino ethyl methacrylate, [2-(methacryloylamino) ethyl]trimethylammonium salts, N,N-dimethylaminopropyl acrylamide, N,N-dimethylaminopropyl methacrylamide, acrylamidopropyl trimethyl ammonium salts, methacrylamidopropyl trimethylammonium salts, and quaternized vinylimidazole