Propionyl L Carnitine Erectile Dysfunction: What the Evidence Shows and How It Fits Into Daily Use Some supplements that can lower blood sugar may lower it too much if you take them with medication. Other supplements may raise blood sugar. See link below PDF) Comparison of pharmacokinetics of L carnitine, Acetyl L carnitine and Propionyl Lcarnitine after single oral administration of L carnitine in healthy volunteers Our cardiologist explains which vitamins and supplements to avoid with high blood pressure. Glycine Propionyl L Carnitine and Erectile Dysfunction