l-carnitine l-tartrate webmd BulkSupplements Powder 1 Kilogram or better metabolic health Pure Encapsulations - L-Carnitine Fumarate
Description
This is taken up into the cytosol by highly efficient glucose transporters (GLUTs)

Following EFSA (2014) recommendations, current regulations specify a minimum choline content of 25mg/100kcal in infant formula, however it is not considered a necessary ingredient in follow-on formula

Blanchard G, Paragon BM, Milliat F, Lutton C: Dietary L-carnitine supplementation in obese cats alters carnitine metabolism and decreases ketosis during fasting and induced hepatic lipidosis
Since there are ZERO stimulants, theres no need to cycle on or off to avoid tolerance