l-carnitine + acetyl-l-carnitine NOW Foods Supplements, Acetyl-L Carnitine 500 mg, Amino Acid, Brain And Nerve Cell Function*, 50 Veg Capsules : Health & Household Acetyl L-Carnitine 500 mg Supplement
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[DOI] [PMC free article] [PubMed] [Google Scholar] 307

There are several types of Carnitine: D-Carnitine is inactive and may cause liver inflammation

[1] Fielding, Roger et al

In addition, the L-Carnitine Liquid is enriched with vitamin B6, which contributes to normal energy metabolism

(PubMed) Nagata C, Wada K, Tamura T, et al

Androgen-mediated regulation of skeletal muscle protein balance
