Due to its key role in metabolism and detoxification processes it continuously deals with different substances and compounds resulted from metabolism paths which may have destructive impacts on it [1]
l-Acetylcarnitine induces analgesia by selectively up-regulating mGlu2 metabotropic glutamate receptors
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Tremor: can occur at rest, in the hands, limbs, or can be postural Muscular: stiff muscles, difficulty standing, difficulty walking, difficulty with bodily movements, involuntary movements, muscle rigidity, problems with coordination, rhythmic muscle contractions, slow bodily movement, or slow shuffling gait Sleep : early awakening, nightmares, restless sleep, or sleep disturbances Whole body: fatigue, dizziness, poor balance, or restlessness Cognitive: amnesia, confusion in the evening hours, dementia, or difficulty thinking and understandin Speech: difficulty speaking, impaired voice, soft speech, or voice box spasms Nasal: distorted sense of smell or loss of smell Urinary: dribbling of urine or leaking of urine Mood: anxiety or apathy Facial: jaw stiffness or reduced facial expression Also common: blank stare, choreoathetosis, constipation, depression, difficulty swallowing, drooling, falling, fear of falling, loss in contrast sensitivity, micrographia, neck tightness, trembling, or weight loss

Other reasons for depleted levels include a diet lacking fruit and vegetables, stress, lack of sleep, alcohol intake, chronic disease and infection