It doesn't matter how much vitamin D or zinc you get.
Natural immunity also is not more effective than any vaccine, they are in fact encouraging people to get vaccinated even if they've had COVID before.
I don't think you understand how your body's immune system works if you believe that getting it once makes you invulnerable.
ref:
https://www.cdc.gov/coronavirus/2019...cines/faq.html
Quote:
Emerging evidence shows that getting a COVID-19 vaccine after you recover from COVID-19 infection provides added protection to your immune system. One study showed that, for people who already had COVID-19, those who do not get vaccinated after their recovery are more than 2 times as likely to get COVID-19 again than those who get fully vaccinated after their recovery.
Note that they link to actual studies and evidence, not what you heard from your buddies on the golf course.
ref:
https://www.cdc.gov/coronavirus/2019..._1635540493225
ref:
https://www.cdc.gov/mmwr/volumes/70/wr/mm7032e1.htm
There's an endless roll of people in the news who state what you're stating -- or outright deny that the vaccines work at all -- who then contracted COVID and then either pleaded with everyone to get vaccinated or died as a result.