l carnitine inj L-Carnitine Injection 100ml L-Carnitine: Boost Energy & Performance
Description
In addition to fat metabolism, L-Carnitine supports energy production and endurance

Acetyl-L-Carnitine (ALCAR): Includes an acetyl group, allowing it to cross the blood-brain barrier

Minkler PE, Stoll MSK, Ingalls ST, Hoppel CL Journal of chromatography

It's very powerful but I would not recommend this for complete beginners as it's too strong for a beginner
Inositol vs choline, what is the difference

3 : 225230 Bella R, Bondi R, Raffaele R, Pennisi G
