My 25 (OH) came back at 17. I am a fair, blue eyed petite New England woman 56 years just through menopause. I work outdoors as a mail carrier, but wear sunscreen on my face daily. This winter I was taking 1,000 D3 and 1250 fish oil although had stopped the d3 prior to my 2 weeks in sunny Florida. Two weeks after my return to the north, I had the blood test mentioned earlier. Doc recommends 800 of supplementation and retest in 3 months. I do have family history of heart problems though I am fine so far. My feeling is to supplement with 5,000 instead of the 800 recommended. Would like your input.