I suggest you enjoy your placebo effects and take a physiology course. (You can verify that this is the placebo effect by studying and doing research, but I won’t link how to do that for you, I know that’s unkind of me to do)
Go peddle your snake oil elsewhere.
OP, go see a medical doctor who knows more about human physiology than some snake oil sells person on the internet.
But the social media research I did says Vitamin A is the natural way to build up immunity! /s
Snake oil sales persons everywhere. Supplements should have been regulated by the FDA from its inception.