l-carnitine oral vs injection VS. INJECTABLE Does it really matter which you use? 🤷🏽‍♀️ Both have pros and cons but it really comes down to what is going to be most suited to use Injectable L-Carnitine: What It Is,

During this period, cortical GABAergic synapses are still undergoing the excitatory-to-inhibitory switch, which occurs mainly between P7 and P14 [10, 45,46,47, 49]

Suppl.2 Nunez Herrero L, Chaucer B, Zafar W, Davalos F, Salman S, Naing S

Adipose tissue dysfunction (increased cytokines/chemokines, immune cell infiltration) links to insulin resistance

In other words, they're broken down

ROS triggers inflammation by activation of NLRP3 inflammasome (Mittal et al., 2014)

This substantial deacetylation is the reason that high plasma levels of acetyl-l-carnitine are not observed after its oral intake, unlike after parenteral administration, during which the substance bypasses the gut and enters the bloodstream directly