Injectable L carnitine works better than oral because it goes straight into your bloodstream, giving almost 100% of absorption versus only 518% with capsules or liquid. Oral L carnitine can take upto 4 PDF) Enhanced Bioavailability of L Carnitine After Painless Intradermal Delivery vs. Oral Administration in Rats PDF) Comparison of pharmacokinetics of L carnitine, Acetyl L carnitine and Propionyl Lcarnitine after single oral administration of L carnitine in healthy volunteers Efficacy of Intravenous Versus Oral Administration of Levocarnitine in Maintenance Hemodialysis Patients: A Randomized Controlled Trial Investigating Therapeutic Approaches to Renal Anemia Rehman 2025 Health Science Reports Wiley Online Library L Carnitine Linus Pauling Institute Oregon State University