l-carnitine safe doses dosage of l carnitine L-Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians Protocol for Life Balance L-Carnitine
Description
When amino acids are scarce, the GCN2/eIF2/ATF4 pathway activates, increasing the expression of amino acid transporters on the plasma membrane [77]

Insulin-mediated GLUT4 movement to the plasma membrane and its continuous recycling with receptor stimulation represents a mode of transporter regulation that is distinct from the more typical regulation by gating of transporter activity

"Glycine propionyl-L-carnitine increases plasma nitrate/nitrite in resistance trained men"

Axe (draxe.com) L-Carnitine - A Review of Benefits, Side Effects and Dosage (healthline.com)

What it's for Energy metabolism support

Some people who may have a deficiency due to their diet, certain medical conditions, or high levels of physical activity may have an l-carnitine deficiency
