l carnitine is derived from L-Carnitine in Mitochondria Creatine & Acetyl-L-Carnitine Energy Plus,

doi: 10.1242/jeb.01730

Parabacteroides distasonis showed a significantly higher abundance among HH-R (logFC = 0.4329, p adj = 0.018), but no significant difference was seen in LH-R

10.1007/BF00314926 27

Eur J Appl Physiol

Caffeine is known to improve an athletes performance, notably helping increase the number of repetitions to failure in both upper and lower-body exercises

For example, C16-carnitine (10 M) may impair mitochondrial function in rat ventricular myocytes by accelerating ROS production and increasing the probability of mitochondrial permeability transition pore (mPTP) opening, whereas low concentrations (1 and 5 M) of C16-carnitine lightly hyperpolarize the m but do not open the mPTP [293]