the dosing was 60,000 IU per month? that's only 2000 IU per day - most vitamin D dosing for effective results i've seen needs to be 10,000 IU per day, implying that they are drastically under-dosing the participants. and i agree with the other commenters who say vitamin K is necessary for proper absorption, and also that vitamin D from sunlight is more effective. so imho more studies should be done with a 10,000 IU daily dose.