Recrystallise the chloride from isopropanol. Dry it over P2O5 under high vacuum. The S-betaine crystallises from EtOH/Et2O with m 145o(dec) and is hygroscopic; it has  D -19.5o (c 6, H2O). [Krimberg & Wittandt Biochem Z 251 231 1932, Strack et al. Z Physiol Chem 238 191 1936, Beilstein 4 III 1630, 1632.]
Acetyl-L-Carnitine (ALC) is an important dietary supplement. ALC is a natural substance, present in the human body, especially in muscles, in the brain, and in the male testicles. ALC is the acetylated, high-energy form of L-Carnitine.