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 Supplements to Lower Blood Pressure ConsumerLab.com PDF) Comparison of pharmacokinetics of L carnitine, Acetyl L carnitine and Propionyl Lcarnitine after single oral administration of L carnitine in healthy volunteers Swanson Vitamins Propionyl L Carnitine HCl & Glycine Support