None of them. Vitamin D is fat soluble and it's possible build up toxic levels of it. At the same time many studies suggest that humans need much higher doses t

None of them. Vitamin D is fat soluble and it's possible build up toxic levels of it. At the same time many studies suggest that humans need much higher doses than typically recommended, and some studies suggest that spaced hyperdosing is a much more effective way of recovering from a defficiency than a frequent small dose. So adding a small dose to any product will have close to no effect on anyone with a deficiency while adding a dose that's meaningful to address people's deficiencies will push other people to toxic levels.