L Carnitine Linus Pauling Institute Oregon State University Assessing the antioxidant and metabolic effect of an alpha lipoic acid and acetyl L carnitine nutraceutical ScienceDirect Liquid Carnitine 3000mg Plus Old School Labs Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window