My best friend has a cold and I usually get everything she gets... and way worse.... But I have been taking Not Sick combined with Got Sick 2x/Day for the past 4 days or so and have felt a little scratchy throat and crackly ears but no other major symptoms.
My mother and I both use this and have seen our test scores for Vit D go up over time in pretty significant ways. We both have issues absorbing vitamins but not with this. Going on 3-4 years now of use and testing. I can say with great assurance this supplement will raise your Vit D easily.