l carnitine puritan's pride L-Arginine L-Ornithine L-Lysine-60 Caplets (Pack of 3) Acetyl-L-Carnitine, 500 mg, 120 Vegetarian

Effects of L-, D-, and DL-carnitine on morphometric parameters of skeletal muscle and exercise performance of laboratory animals receiving carnitine-deficient diet

FoxO inactivation attenuated MURF-1 expression in quadriceps fem oris muscle of supplemented rats (compared to control) [33]

Show details ABSTRACT Growth hormone (GH) plays important roles in adult life, including maintaining lean and bone mass, promoting lipolysis to limit visceral adiposity, and regulating carbohydrate metabolism, cardiovascular function, aerobic exercise capacity, and cognitive function

In other words, pills can take longer to raise B12 levels, so if you need a quick boost, injections are the better choice