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[DOI] [PMC free article] [PubMed] [Google Scholar] 149.Karim M, Jackson P, Jackowski S

Other mechanisms including mitochondrial structural changes, however, may underlie in respiratory capacity recovery effect with PQQ pretreatment, because glutamine supplementation did not fully recover respiratory capacity

doi: 10.3390/ijms21041366

Key Takeaways L-Carnitine transports fatty acids into mitochondria for energy production it supports fat use, not direct fat burning Its effectiveness depends heavily on exercise and existing carnitine status, not on the supplement alone Vegetarians and vegans, who get less dietary carnitine from food, may see more noticeable benefit than habitual meat-eaters Clinical doses typically use 1000-2000mg per day, often with a carbohydrate-containing meal for better uptake It works best as an exercise-performance support tool, layered onto an existing active routine L-Carnitine occupies an interesting place among weight loss ingredients it's not hyped the way Garcinia Cambogia once was, but it's also one of the more mechanistically well-understood compounds in sports and nutrition science