L Carnitine Natural Fitness Support NOW Supplements Is L Carnitine a Natural Weight Control Supplement? Bella All Natural Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications 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 Country Life Acetyl L Carnitine Capsules, 120 ct QFC