what is l carnitine for Deficiency: It, Causes, Symptoms, and More The Role of l-Carnitine in

The body's requirement for L-carnitine is on average 8-11 mg per day, but it increases significantly among physically active people

The authors suggested it might slow the progression of the disease, but proper trials would need to determine its mechanism and effectiveness [46]

Transl Psychiatry

The brain, sensing a drop in blood pressure and oxygen, initiates a "fight or flight" surge of adrenaline and norepinephrine, which causes the rapid, pounding heart rate (tachycardia), severe lightheadedness, and physical tremors associated with orthostatic intolerance

Pharmacological treatments for fatigue in patients with multiple sclerosis: a systematic review and meta-analysis

For some, stimulants may cause all sorts of adverse reactions that can cause them to feel jittery, experience a rapid heart rate, and even prevent them from getting quality sleep at night