Acetyl L carnitine is a white crystalline solid that resembles snow. It has a mild odor similar to vinegar. It is a metabolite of L carnitine, derived from the amino acid L lysine in a series Acetyl L carnitine erectile dysfunction: What the evidence and real world use actually show L Carnitine Linus Pauling Institute Oregon State University Compounded Carnitine (L) Injection Empower Pharmacy Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications