Legs twitching and sometime thigh vibrates hard, twitching moves to top half but not as often. magnesium deficiency? calcium fine.

Possible magnesium: It could be magnesium deficiency, or "restless leg syndrome". The easiest thing to do would be to start taking a magnesium supplement. If you continue to experience the symptoms, I would then suggest you see a primary care physician. Have you had any lab tests (blood) done? I assume you have if you know your calcium levels are normal.