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 Vitacost Acetyl L Carnitine HCl 500 mg 300 Capsules L Carnitine: Benefits, Dosage, Side Effects, and Food Sources Dr. Rogers Centers.com The adverse effects of long term l carnitine supplementation on liver and kidney function in rats L Liu, D M Zhang, M X Wang, C Y Fan, F Zhou, S J Wang, L D Kong, 2015 L Carnitine: Benefits, Dosage, Side Effects, and Food Sources Dr. Rogers Centers.com Acetyl L Carnitine Superior Supplement Products Science First Designs for Health