does the body produce l carnitine Deficiency: What Is It, Causes, Symptoms, and More Boost Fat Burning with L-Carnitine:

Loren Pickart and colleagues isolated a short peptide from human plasma that extended the lifespan of cultured liver cells. They identified its sequenceglycyl-histidyl-lysine (GHK)and discovered that when bound to copper ions, it formed GHK-Cu, a complex with strong biological activity in cell growth and tissue repair

Non-sterile products raise infection risk

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Injection-related effects can include redness, swelling, tenderness, or irritation at the site

On the contrary, three other studies have shown no effect of L-carnitine on performance

third-party labs via HPLC and Mass Spectrometry