I'm 26 years old and have been on a very low dose of Levothyroxine (.25mcg) for the past decade. Blood tests have confirmed that this dose is keeping my levels at a normal range. I recently got a new doctor through my mental health clinic and she said I should take more to boost my mood and give me more energy, so she gave me a new prescription for .75 mcg. My question is, is it safe to take more than I need? I know she is a doctor, but I'm quite worried about the health risks of introducing more hormones into my system than is necessary.