L Carnitine in Mitochondria Encyclopedia MDPI Mitochondria are the tiny "power plants" inside almost every cell, generating the energy your body needs to function. Supporting them is crucial for everything from brain function to athletic performance. Nutrients like PDF) Effects of a topical lotion containing aminophylline, caffeine, yohimbe, l carnitine, and gotu kola on thigh circumference, skinfold thickness, and fat mass in sedentary females Figure 1. [The carnitine shuttle]. GeneReviews NCBI Bookshelf