can you inject l carnitine everyday L-Carnitine Injection: Maximize Fat Burning, Energy & Metabolism How To Inject L Carnitine:

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One hundred twenty men between the ages of 60 and 74 with symptoms of low testosterone were randomized to receive 160 milligrams orally administered testosterone undecanoate, 2 grams propionyl-L-carnitine plus 2 grams acetyl-L-carnitine per day, or a placebo for a six month period

doi: 10.4103/1673-5374.320969

This is known as off-label prescribing

The erythrocytes were then lysed with lysis buffer (BD Pharm Lyse, BD Bioscience, San Jose, USA) for 10 min followed by centrifugation (250 x g, 5 min, 4C, Centrifuge 5427 R, Eppendorf SE, Hamburg, Germany) and resuspension of the cells in Hepes-buffered saline (HBS, 14 mM Hepes, 0.9% NaCl)