l carnitine reduces belly fat L-Carnitine Dosage for Weight Loss: A Guide Episode 129 – L-Carnitine and
Description
Taking up to 2 g/day in 3 divided doses is recommended to avoid any side effects [11]

They share some benefits, like helping with energy production, but have clear differences too

Alzheimers Dement 15, 106152

Individuals with heterozygous mutations are asymptomatic carriers with no clinical consequences