I recommend pure vitamin D3 supplementation if there is insufficiency (<30) or deficiency (<20), without any added calcium. There is previous data, and this article supports it again that too much calcium supplementation increases CV risk. This concern was published previously, several years ago. The most one should take of daily calcium supplementation, if any should be no more than 500 mg. The interesting paper would've been the benefits of pure vitamin D supplementation, without any added calcium.