Brief Answer: Vitamin D Detailed Answer: When I see blood levels of 14.7 in a patient of mine along with normal calcium and PTH, I generally recommend daily supplementation with over the counter vitamin D3 (cholecalciferol) 5000 IU. Levels should be rechecked in 2 months to see there is still a deficiency, and also to ensure too much is not given. The goal is to keep blood vitamin D levels in the range of 30-50. The daily supplementation can be adjusted between 1000 - 3000 IU daily to keep blood levels in this target range. Low vitamin D has been linked to a variety of symptoms. If your complaints improve after a few weeks of treatment, then it is likely they were due to vitamin D deficiency. If not, then you should see your primary care physician to determine the next course of action. Vitamin D will not affect the cholesterol levels. The 7 mm isoechoic nodule is statistically benign. You may wish to perform an ultrasound 6 months after the previous one to look for growth/change in characteristics of the nodule, if any. If you have risk factors for thyroid cancer (like past or first degree family history of thyroid cancer, or exposure to ionizing radiation to your upper body) then performing a fine needle aspiration biopsy of the thyroid nodule is recommended. But first, the radiologist needs to confirm if it is indeed a thyroid nodule or not

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