Wash your hands frequently for about three minutes. Use hand sanitizers. But, it will not protect you from those that bring people around you from work or home that cough or sneeze. Vitamin D, C and other vitamins that is said to increase immunity is supposed to help. Plenty of rest is the best.
I don't take vitamins, but I've been taking Sambucol since Wednesday, along with eating right, washing hands,exercise and sleep.
So far no symptoms.
So, UPDATE:
It is status post 7 days since I came into close contact (hugging) the 2 year old that was in the office last week and next day tested positive for FLU TYPE A. Her father had been sick all weekend. (Her mommy probably should not have brought her to the office to see her grandma.) So far, I still have no symptoms. My appt to get the flu shot was late this year, and I didn't get it until last Tuesday evening. My exposure was that ONE of my office co-workers went home sick Tuesday, sick as a dog (probably should NOT have come in at ALL on Monday) and my other co-worker came down with full fledged symptoms on Wed. night. and didn't come in the rest of the week.
Anyhoo - Has anyone heard of Sambucol? It's a Black Elderberry homeopathic remedy. When that Co-worker came in on Wed,(before symptoms showed up) she had gone and gotten it, as it was recommended by her housekeeper. Don't laugh - I checked it out with my pharmacist and she said that there ARE actually studies on this (I looked some of them up) and that they are being shown to help with the Flu (I can link below). It has the Black Elderberry, Zinc and Sulpher in it and she said she recommended those for the immune system. That's good - as I'd started taking them mid-day last Wednesday- every 3 hours while I was awake.
Other stuff I do regularly: I take probiotic capsules every day, I walk for cardio exercise about 2-3X a week,(unless I can't, and then I just pick it back up when I can) I do Yoga 2X a week. I drink about a gallon of water a day. I try to eat right most of the time.
I don't know if that is going to prevent the flu, (or any other cold) but so far-so good. Even when I got COVID I was not that sick. (I was rally SICK for a couple of days, but the other days were not as bad overall) Flu Type A seems to be pretty bad, almost worse than COVID, from what I've seen. At least as contagious, too!