Insight into the metabolic shifts in Graves' hyperthyroidism: a study of acylcarnitine and lipid profiles in: European Thyroid Journal Volume 14 Issue 3 (2025) iSatori Liquid L Carnitine LS3 3000 Oxyenergys L Carnitine. My go to pre post workout supplement. Pre workout I usually take it before my workout session for energy production. Post workout Ill take it the day after my workout Nutricost Acetyl L Carnitine 500mg, 180 Capsules Non GMO and Gluten Free : Amazon.co.uk: Health & Personal Care L Carnitine Arazo Nutrition