The flu vaccine is a poor example... it has a 50% failure rate. Every year it's the same story "oops, it was a different strain this year"
Im thinking if one takes D3 and Zinc Sulphate they probably wont get the flu.
Pretty sure they wont if taking proohylactic dose of ivermectin or Hydroxychloroquine also.
Unsure what D3 is. I am familiar with the rest. miles
Last sentence is the meat......Vitamin D is a fat-soluble vitamin that your body can store for long periods of time. Of the two main forms — D2 and D3 — the latter is more effective at raising vitamin D levels in your blood.
What Does It Do in Your Body?
Vitamin D needs to undergo two conversion steps to become active .
First, it is converted to calcidiol, or 25(OH)D, in your liver. This is the storage form of the vitamin.
Second, it is converted to calcitriol, or 1,25(OH)2D, mostly in your kidneys. This is the active, steroid-hormone form of vitamin D.
Calcitriol interacts with the vitamin D receptor (VDR), which is found in almost every single cell in your body.
When the active form of vitamin D binds to this receptor, it turns genes on or off, leading to changes in your cells. This is similar to how most other steroid hormones work.
Vitamin D affects various cells related to bone health. For example, it promotes the absorption of calcium and phosphorus from your gut.
But scientists have recently discovered that it also plays roles in other areas of health, such as immune function and protection against cancer.....source is the web and my PDR....Physician Desk Reference.