BS”D
Be careful with organic; the definition is so loose that who knows what you are getting. There have been several investigations into what organic really means and none of them are too supportive of the organic food industry.
Besides, isn’t it the law that all milk sold in the US or at least in NY must be fortified with Vitamin D? Is the source of the vitamin D also organic? There may be a standard vitamin D solution that is used which would then negate the whole organic claim.