I'm really concerned about my wife's health because her vitamin D levels are super low; it's only at 8 when it should be around 40. Our doctor has prescribed her these vitamin D3 sachets, each containing 60,000 units. She's supposed to take one sachet a week for six weeks, and then after that, it's one sachet every two weeks for another six weeks. That seems like a lot to me. I'm curious if 60,000 units is too high of a dosage for her?