how much l-carnitine is in monster 12CANS:Monster Energy RIPPER JUICE Limited Edition + B VITAMNS 16.9z Carnitine provides consumers with a great tasting Monster Energy 12/19.2OZ | Giant
Description
For this reason, supplementing with this amino acid may especially benefit endurance athletes, such as long-distance runners, swimmers or cyclists

For references and more information , see the section on heart failure in the L-carnitine article

Acetyl-L-Carnitine 500mg x 100 Capules SKU Bioavailable Amino Acid Allergy Research Group's Acetyl-L-Carnitine 500mg supplement crosses the blood-brain barrier more readily than L-carnitine
notably, glucose was maintained in the normal range [100]

Specifically, the Patient Health Questionnaire (PHQ-9) score for depression dropped significantly from 13.03 to 9.84, and the Fibromyalgia Impact Questionnaire (FIQ) score dropped from 49.55 to 43.03
Possible Side Effects and Safety Considerations L-carnitine is generally considered well tolerated at doses used in most commercially available supplements