If you're using injectable L Carnitine, a 27 gauge, half inch needle is ideal. Anything larger can cause the serum to get stuck. For larger doses, using luer locks can make the process Jay How Big Are the Needles for Semaglutide Injections? L Carnitine Injections for Weight Loss Prescription Weight Loss, Inc. CARNITOR Levocarnitine Injection (L Carnitine) 200 mg mL, Single Dose Vial 5 mL, 5 Tray McGuff L CARNITINE Dermaqual Dermaqual L CARNITINE anti cellulite meso cocktail for mesotherapy