Vaccine definition by the CDC seems to now include Vitamin D - Sept 2021

Immunization: The Basics CDC

Definition of Terms

Immunity: Protection from an infectious disease. If you are immune to a disease, you can be exposed to it without becoming infected.

Vaccine: A preparation that is used to stimulate the body’s immune response against diseases. Vaccines are usually administered through needle injections, but some can be administered by mouth or sprayed into the nose.

Vaccination: The act of introducing a vaccine into the body to produce protection from a specific disease.

Immunization: A process by which a person becomes protected against a disease through vaccination. This term is often used interchangeably with vaccination or inoculation.

CDC page last reviewed: September 1, 2021

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Merriam Webster definition

• 1: a preparation that is administered (as by injection) to stimulate the body's immune response against a specific infectious agent or disease:

Vitamin D appears to meet the CDC definition of a VACCINE!

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VitaminDWiki Immunity category:

262 items in Immunity category

    see also

Virus category listing has 1342 items along with related searches

Overview Influenza and vitamin D
Vitamin D helps both the innate and adaptive immune systems fight COVID-19 – Jan 2022
Vitamin D aids the clearing out of old cells (autophagy) – many studies
600,000 IU of Vitamin D (total) allowed previously weak immune systems to fight off a virus antigen - Nov 2020
Search for treg OR "t-cell" in VitaminDWiki 1440 items as of Jan 2020
141 VitaminDWiki pages contained "infection" in title (June 2021)
Search VitaminDWik for BACTERIA in title 25 items as of Aug 2019
Vitamin D and the Immune System – chapter Aug 2019
7X less risk of influenza if Vitamin D levels higher than 30 ng – Oct 2017
Common cold prevented and treated by Vitamin D, Vitamin C, Zinc, and Echinacea – review April 2018
Vitamin D improves T Cell immunity – RCT Feb 2016
Immune system - great 11-minute animated video - Aug 2021
   Only the brain is more complex, nothing about Vitamin D
18 titles in VitaminDWiki contained INNATE or ADAPTIVE as of Jan 2023
Increasing publications on vitamin D and Infection

47 studies are in both Immunity and Virus categories

short URL= https://is.gd/cdcvaxd