Can I still give vitamin C, zinc, and a multivitamin along with the protocol to boost the immune system?

There is no way to improve normal immunity. One can only improve immunity by reversing the conditions causing poor immune function. Improved nutrition, more sleep, and reduced inflammation are a few well-known methods to improve impaired immune function. Supplements such as Vitamin C, zinc, and multivitamins have no impact unless one suffers from extreme malnutrition.