Hi My Mother In Law Is On For Two Daily

Hi my mother in law is on for two daily for severe osteoporosis. She is on this for the last 6 months and she feels that she is benefiting from it which we are delighted about. However I notice she has been taking her oral calcium and vit D supplement. Calcium 1000ug and vit D 400 twice daily. I am concerned this may be too much and I am a little nervous she is supplementing these without medical advice. As she is 80 there are challenges when I question these things. If I was sure this is not the norm I would explore all this in more detail.