The Task Force demotes these therapies to folk remedy status.
The U.S. Preventive Services Task Force has been on a search-and-destroy mission lately: First they knocked PSA tests out of the toolbox, then they nixed a couple of estrogen/progestin therapies.
Now they've issued a draft recommendation saying that "current evidence is insufficient to assess the balance of the benefits and harms of combined vitamin D and calcium supplementation for the primary prevention of fractures in premenopausal women or in men."
This is an "I" rating -- not the prohibitive "D" of their recent recommendations, but a declaration of lack of faith in the available evidence.
The Force sees no evidence that Vitamin D does anything for cancer, either to prevent it or decrease mortality. Same for calcium carbonate as a way to prevent osteoporotic fractures in postmenopausal women.
On the other hand, "≤400 IU of vitamin D3 and 1,000 mg of calcium carbonate increases the incidence of renal stones." So we're in "more harm than good" territory here.
They're taking comments if you think they missed something.