was macht l thyroxin im körper — what symptoms are typical?

L-thyroxine (levothyroxine) is a synthetic thyroid hormone used to treat hypothyroidism (underactive thyroid). It replaces the missing T4 hormone, which is converted to the active T3 in the body, thereby normalizing metabolism, heart rate, body temperature, and energy levels. Typical symptoms of hypothyroidism that improve with treatment include fatigue, weight gain, cold intolerance, constipation, dry skin, hair loss, brain fog, and depression. Overdose can cause hyperthyroid-like symptoms: palpitations, anxiety, tremors, insomnia, sweating, diarrhea, and weight loss. Dosing is individualized based on TSH levels. Caveat: L-thyroxine is a prescription drug; self-medication or use for weight loss is dangerous and not supported by evidence.