I'm 39 female 5'1" & weigh 140. my vit d, 25-hydroxy level is 27.8 ng/ml. my family doc told me to take 1, 000 iu a day? how much vit d should i take?

Vitamin D: Your vitamin d level is low, and a healthier one would be at least 50ng/ml. Perhaps you do not trust what your doctor told you, so are asking online physicians about this? You could take 2000-5000iu/day, especially in winter. Talk with your doctor about this. Testing again in 3-4 months will give you a signpost to ongoing replacement as needed.