l- carnitine use When To Take L to Maximise Your Shredding and Beyond – BSc Supplements Carnitine: the claims and why

Thus, if a patient with a normal TSH presents with symptoms consistent with hypothyroidism, including fatigue, weight gain, depression, cold extremities, muscle aches, headaches, decreased libido, weakness, cold intolerance, water retention or PMS, a combination of both clinical and laboratory assessment should be used to determine the likely overall thyroid status and if a therapeutic trial of straight T3 or a T4/T3 combination is indicated

Disturbance in mitochondrial function may also contribute to or cause the fatigue seen in ME/CFS [102] and long-COVID [108]

The endogenous production of creatine contributes an essential role in replenishing protein requirements and provides the smooth function of several vital organs

Only three studies used intravenous L-carnitine [21,44,45]