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Based on the results of this one small study, claims that L-carnitine helps reduce weight are not supported at this time

Additionally, it's crucial to follow the recommended dosage guidelines as high doses may cause gastrointestinal problems or harm kidneys

[DOI] [PubMed] [Google Scholar] 133.Al-Majed AA, Sayed-Ahmed MM, Al-Omar FA, Al-Yahya AA, Aleisa AM, Al-Shabanah OA

Most people do fine, but some may experience mild digestive issues such as nausea or vomiting

Vidal-Casariego 2013 meta-analysis: Four RCTs with 284 type 2 diabetes patients showed 23 g/day L-carnitine for 1252 weeks reduced fasting glucose, total cholesterol, LDL cholesterol, and apolipoproteins B100 and A1 but NOT triglycerides, lipoprotein(a), or HbA1c [3][43]