The Science of Carnitine: How It Works and Why It Matters Liquid L Carnitine 3000 delivers a powerful blend of three forms of L Carnitine to support fat metabolism, endurance, and recovery. Each serving packs 3000 mg in a fast absorbing, no mixing required liquid that NutraKey Health Acetyl L Carnitine Effectiveness varies: L carnitine may help with fat metabolism, but it's not a magic weight loss pilldiet and exercise still matter most. Forms matter: Regular L carnitine general use Acetyl L carnitine brain & energy