phytoceramides [SEP] After taking this for just two days I developed terrible pains in my back. I was also very restless and had trouble going to sleep. Since I've taken vitamins D &C in the past with no trouble I did some research on vitamin A. Muscle and joint pains are a side effect of too much vitamin A. The recommended dose for seniors is 750 mcg. All i can say is this not for me.. i had such high hopes.