My Vitamin D level was tested this week and is seriously low. I've been prescribed an 8-week treatment of one 50,000 iu pill per week. I'm a little skeptical about such a large dosage at once and wonder how quickly I will feel a positive impact. I've been more fatigued that usual, have lost perhaps 1/3-1/2 of my hair and am having severe joint /muscle pain in my legs (xrays showed only minimal inflammation). Any thoughts you can provide are appreciated!