I get bloodwork done twice annually, so I have a very accurate idea of what my levels are. The dosage is the recommendation from my doctor based on my bloodwork

I get bloodwork done twice annually, so I have a very accurate idea of what my levels are. The dosage is the recommendation from my doctor based on my bloodwork. The goal isn't just staving off seasonal affective disorder, but actually trying to get me roughly into the middle of the ideal range because of its myriad health benefits.