Taking L Carnitine with Semaglutide The Sanctuary Wellness Institute When to take L carnitine: Dosage, forms, and side effects The Insight New research shows that a six month course of L carnitine supplementation, given at 100 milligrams per kilogram of body weight per day, led to meaningful improvements in children with According to a randomized, double blind, placebo controlled clinical trial published in Elsevier journal Research in Autism Spectrum Disorders (2013), l carnitine supplementation demonstrated a significant therapeutic benefit in children diagnosed with