Well Loretta why did you “decrease” the amount you were taking? Your tested amount of 71nmol/l translates to 28 ng/ml and we recommend a level of 50ng/ml or 125 nmol/l. Your levels need to increase to a minimum of 125nmol/l. Everything you listed above can be caused by Vitamin D deficiency. So whatever amount you were taking before dropping to 4000iu was not enough.