Potential Adverse Effects of L-Carnitine Published: 27 February, 2026 | 5' L-carnitine is a crucial compound in fat metabolism and can be taken as a supplement for people with a very active lifestyle or with a high metabolic demand
While compounded medications themselves are not FDA-approved, they use the same active ingredients as the branded versions
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Consult your GP if you experience unexplained weight gain (particularly facial and abdominal), persistent hypertension, easy bruising, purple stretch marks, muscle weakness, or mood changes
These symptoms are usually mild and improve as your body adapts to the medication
Even at the lowest dose (5 mg), patients lost 34 pounds on average