Fatigue is a state of physical and/or mental exhaustion, characterized by weakness, lack of energy, difficulty concentrating and reduced physical performance.

Multiple sclerosis (MS) is a chronic autoimmune disease in which the immune system attacks the myelin sheath of nerve fibers, leading to damage in the nervous system. It manifests as motor, sensory disturbances and fatigue.

Learning difficulties refer to challenges in acquiring knowledge and understanding material, which can arise from various causes, such as attention and concentration disorders.

Cerebral ischemia is a condition in which the blood flow to the brain is reduced or interrupted, leading to a lack of oxygen for brain cells. This can result in tissue damage and neurological disorders. Ischemia can be caused by an embolism, thrombosis or narrowing of blood vessels.

Jet lag is a physical phenomenon related to the disruption of the body's circadian rhythm, which occurs after long travel across time zones, leading to fatigue and sleep problems.

Muscle pain (myalgia) is a condition associated with pain, stiffness, or tension in the muscles. It can result from excessive exertion, injuries, infections, inflammation or chronic diseases.

Erectile dysfunction is the difficulty in achieving or maintaining an erection sufficient for sexual intercourse.

Hearing problems include difficulties in hearing or understanding speech. They can result from damage to the inner ear, infections, aging, noise exposure, genetic disorders or neurological conditions.

The prevention of aging signs (anti-aging) is a process or actions aimed at delaying or reducing visible signs of aging, such as wrinkles and loss of skin firmness. This includes the use of cosmetics, a healthy diet and lifestyle.

Decreased concentration is difficulty focusing on a single task, leading to easy distractibility, forgetfulness and reduced efficiency in completing tasks. It can be caused by fatigue, stress, emotional issues, lack of sleep or neurological disorders.

Dementia is a syndrome of symptoms associated with the progressive impairment of cognitive functions such as memory, thinking, orientation, language and decision-making abilities. The symptoms worsen over time, leading to a loss of independence.

Neuroprotection is a process or action aimed at protecting neurons from damage, degeneration or oxidative stress, which can lead to neurodegenerative diseases such as Alzheimer's or Parkinson's.

Angina pectoris is chest pain caused by inadequate blood flow to the heart, often due to coronary artery disease. It manifests as pain, pressure and shortness of breath, particularly during physical exertion.

Arrhythmia is a heart rhythm disorder that can manifest as a heartbeat that is too fast, too slow or irregular. It can lead to dizziness, fainting and in more severe cases, can be life-threatening.

Apathy is a state of emotional indifference, lack of interest, and motivation to take action.

Memory disorders are problems with storing, recalling or remembering information. They can include difficulties in remembering names, dates or events.

Regeneration in sports is the process of restoring the body to full functionality after physical exertion, often following injuries or strain on muscles and tendons. It involves rest, proper diet and hydration. Regeneration helps prevent injuries and improves athletic performance.

Weight loss is the process of reducing body mass, usually through a reduction in calorie intake, increased physical activity, and changes in eating habits, aimed at improving health and body shape.

Neurodystonia is a group of neurological disorders that cause involuntary muscle spasms, leading to uncontrolled movements or postures.

Depression is a mental disorder characterized by persistent feelings of sadness, hopelessness, lack of energy and loss of interest in life. It can affect daily functioning and may require treatment.

Strengthening of the heart involves using supplements containing ingredients that support heart health, such as omega-3 fatty acids, magnesium, coenzyme Q10, vitamins D and E, and antioxidants.

Fainting is a brief loss of consciousness, usually caused by a drop in blood pressure, brain hypoxia, or other health issues. It is characterized by dizziness, weakness and a lack of response.