l-carnitine lla 500mg with some mentioning a strong aftertaste or poor flavor quality Promo: Liquid L-Carnitine – Cutler
Description
Following intravenous injection of acetyl-l-carnitine, its plasma concentrations increased quickly and then declined, reaching base values within 12 h [41]

Importantly, multiple studies have indicated that supplementation with specific amino acid derivatives can be advantageous for alleviating the phenotypic manifestations of cachexia

They recommend monitoring carnitine levels and metabolic function, and considering supplementation only if deficiencies are identified or if clinical signs suggest a need

(PubMed) Hatanaka Y, Higuchi T, Akiya Y, et al
