I’ve been around more sick people than you can shake a stick at lately and not a hint of catching anything, I upped my D to 2000mg this year even living in a sunny climate, my massage therapist seems to be sick all the time lately because of having a little grandbaby and she works in that dark room all day, I keep telling her to start taking D...
Not to bust chops but vitamin D is usually expressed in IUs. Grams and milligrams would likely kill an elephant.