When to take L carnitine: Dosage, forms, and side effects Propionylcarnitine C10H19NO4 CID 188824 PubChem Dr Acetyl l carnitine has been compared to placebo treatments. It's also been compared to standard antidepressants. Most of those studies lead to the conclusion that acetyl l carnitine works like Propionyl L carnitine d3 hydrochloride Stable Isotope MedChemExpress Propionyl L carnitine hydrochloride CAS 119793 66 7 Selleck GPLC 1250 mg 60 Capsules Non GMO Gluten Free High Potency Glycine Propionyl L Carnitine HCL Supplement by Carlyle