Never thought this minute vit. could do trouble, 1.8 yrs had vit d less than 3 knee pain ,now its 42, but still had knee weakness calf pain its been almost 2 yrs but have not got my strenght, pls let me know dr. how much more time ??? even when vit d is 42 above nrml why this muscles pain n knee weakness an tingling in legs will it ever cure ??? what else or whom should I take hlp, currently on ortho treatment.