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Is NAT C and NAT D good for old people for prevention against covid ?

Salamun alaykum,

Hope this reaches in best of health

COVID or any other infection for that matter can not be prevented by any vitamins. What certain nutrients may assist with is to help boost the immune system to fight the virus.

To prevent COVID one should:
- clean hands often - sanitize or wash with soap and water.
- maintain social distancing
- wear a mask
- don't touch eyes, nose or mouth unnecessarily
- staying home if feeling unwell
- seek medical help if unwell

Hope that helps.

Best regards