l carnitine im or subq How to Self-Administer Subcutaneous & Intramuscular Injections L-Carnitine Injections: A Clinical Guide
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While not horribly expensive, they arent necessarily cheap either

Barrier permeability is evaluated by detecting indicators such as transepithelial electrical resistance (TEER) and fluorescein sodium permeability

However, the source of the free ammonia necessary for glutamine synthesis is not clear

Changes in gastric microbiota induced by Helicobacter pylori infection and preventive effects of Lactobacillus plantarum ZDY 2013 against such infection

However, the limited half-life in the blood and lung distribution restricted the clinical application of PEG2 via systemic delivery
