Please may I get some advice and experiences re vit d? I have been diagnosed with low vitamin d. Below 20. Gp has me on Accret D3 calcium/vit d. 2 daily gives 2 x 400 IU. Vitamin D council say 5000 IU up to 10000 IU. I have been taking them for 2 weeks and do feel a little bit better already, it takes a while I think to really feel the difference? I wondered if my dose is enough? Should I get back to the gp and ask for an increase? Thank you.