T cells need vitamin D to activate

T Cells Need Plenty Of Vitamin D & C For Good Fighting Immune System

T cells are a type of white blood cell. Why are they so very important? Because they are an integral part of your immune system. T cells help protect the body from infection, and there has been a lot of that going around lately! Here’s something that’s evidently VERY important for your T cells… They need plenty of vitamin D and vitamin C to do their job!

Reuters recently reported (regarding Omicron), “A key part of the immune system’s second-line defense – its T cells – are highly effective at recognizing and attacking the Omicron variant, thereby preventing most infections from progressing to critical illness, a new study shows.”

Similarly, recently reported via The Atlantic, “T Cells Might Be Our Bodies’ Best Shot Against Omicron”. “The new variant may undermine some vaccine-derived defenses. But the immune system’s best assassins [ Killer T cells ] are likely to hold the line.”

This message is being reported quite widely lately… And I am happy to see and read this. Why? Because it has been well know for many years. That is, our natural immune system is exceedingly important to our health! Because of this, we really should do the right things to help our immune system, especially during these times!

Plenty of vitamin D (with magnesium for absorption) and vitamin C for good fighting t-cells. T-cells are the superheroes of the immune system.

Do you know what? A very large percentage of our society is woefully deficient in vitamin D and vitamin C. That’s not good for the immune system! And may partly explain some of what we’ve been seeing. Read to the end where I talk about what I’ve been doing for myself in this regard.

Vitamin D – Crucial to Activating Immune Defenses

Scientists have found that vitamin D is crucial to activating our immune defenses and that without sufficient intake of the vitamin – the killer cells of the immune system — T cells — will not be able to react to, and fight off, serious infections in the body. The research team found that T cells first search for vitamin D in order to activate, and if they cannot find enough of it will not complete the activation process.

You might want to read that again…

Source: Science Daily – University of Copenhagen

The scientists explain further…

“For T cells to detect and kill foreign pathogens such as clumps of bacteria or viruses, the [T] cells must first be ‘triggered’ into action and ‘transform’ from inactive and harmless immune cells into killer cells that are primed to seek out and destroy all traces of a foreign pathogen.”

The researchers found that the T cells rely on vitamin D in order to activate and they would remain dormant, ‘naïve’ to the possibility of threat if vitamin D is lacking in the blood.

For the research team, identifying the role of vitamin D in the activation of T cells has been a major breakthrough.

“Scientists have known for a long time that vitamin D is important for calcium absorption and the vitamin has also been implicated in diseases such as cancer and multiple sclerosis, but what we didn’t realize is how crucial vitamin D is for actually activating the immune system — which we know now. “

Vitamin C promotes the proliferation and effector functions of human T cells

From a study published via Cellular & Molecular Immunology Journal, “Vitamin C (L-ascorbic acid) is an essential vitamin with multiple effects on immune cells.”  

“In the present study, we report that Vitamin C…enhance the activation and differentiation of human T cells under different in vitro culture conditions, i.e., during primary stimulation as well as upon restimulation of short-term-expanded T-cell lines.”


My Immune System Approach Since The Onset Of Covid

It’s hard to believe that it has been 2 years already! However, when the news broke, I began a lot of research about all this. I went far beyond the info from the parrots and talking-heads. I decided it was time to really take my health into my own hands, so to speak.

It was a motivator for both Mrs.J and I to get down to a healthy weight. Comorbidity was obviously a big factor here, and we certainly did not want any of those! We’re now down to our approximate college weight. Feeling great about that. Look into Keto if you’re interested (reducing carbs, cutting out sugar).

Anyway, and furthermore, I knew that Vitamin D (and C) play a big role in the immune system. Knowing that the majority of us are deficient, I began to supplement. Although this is not medical advice, I supplement 5,000 IU of vitamin D each day. I supplement ~500mg of vitamin C several times a day in a glass of water (up to one’s tolerance level).

Few foods naturally contain vitamin D!

It comes from the sun on your skin. A conversion process occurs.

My last blood work indicated my D levels were up to 47 ng/mL. Nice! My historical levels had been in the low 30’s, almost on the low side, probably like many others. I’m shooting for 50+ ng/mL.

I was very disturbed about the mainstream silence and complete avoidance of potential preventative measures and/or treatments. It doesn’t take a genius to figure out why (there were / are several reasons). So, I took it upon myself to research the science. Real science.

There’s more to this story (zinc and others), but I wanted to make you aware of the very high importance of vitamin D (and vitamin C) for your immune system Killer T cells.

[ Read: Vitamin D Equivalent versus Sun Exposure Time ]

Nature Wise D3, 5000 IU

vitamin D for healthy immune system T cells

Natural Acquired Immunity:




  1. “For T cells to detect and kill foreign pathogens such as clumps of bacteria or viruses, the [T] cells must first be ‘triggered’ into action and ‘transform’ from inactive and harmless immune cells into killer cells that are primed to seek out and destroy all traces of a foreign pathogen.”

    In other words they’re the trained sheep dogs, perfectly docile and friendly until they sense a threat.

  2. I certainly agree with the vitamins as preventatives. I worry that we can also affect our immune system ability to work by not letting it have a breather so to speak. Sort of like keeping an engine revved up too long till it says hey, I’m tired and it overheats.

  3. “It was a motivator for both Mrs.J and I to get down to a healthy weight”

    Good advice. According to the CDC, 78% of people admitted to the hospital for covid were either obese or overweight. Heaven forbid Fauci or Wallensky got on tv and told people to lose weight to avoid the hospital. Also, I’d be leery of anything Reuters had to say about anything medical. They are part of the Trusted News Initiative and big pharma are huge donors.



    1. So out of curiosity, what percentage of the general population are overweight or obese? If higher than 78% that’s a meaningless statistic.

    2. Heff,
      Your comment reminded me of a conversation I had with my doctor a few months ago during an annual visit. We were talking about covid, and of course he brought up the vax – though wasn’t pressuring. I politely defended the notion of the human immune system, prophylactic measures, being in good health, not being fat (comorbidity issues) etc.., and upon further prodding he did say / imply that those who were covid patients in our local hospital had been obese. Interesting.

  4. Vitamin D is fat soluble, which may be why being obese is one of the things that puts one at greater risk. I have lost 83 pounds this year (down to just overweight), and will lose another 26 – 30 pounds in the coming year to contribute to get to an optimal weight.

    1. Chipmunk, That’s great! Good for you…

      Yes, I’ve read that because vitamin D is fat soluble, it doesn’t necessarily get where it’s supposed to (for benefit) with those who are obese.

      Keeping working on that last 30! It takes awhile, but it’s doable…

  5. Chipmunk,
    Good work with your weight loss. YEA CHIPMUNK!!
    Don’t forget B-12, I’d highly recommend the sub-linqual stuff. You know, dissolves under the tongue. Thankfully, I don’t struggle with weight issues, but have family members who do. What you’ve done, isn’t easy.

  6. I thougt we just run around naked in the snow to get enough sunlight to make your own D?
    Or.. you don’t do that?

    1. Horse,
      Last time I tried that, the neighbor kid saw me at a distance across the pasture. He ran and told his Daddy that he saw “a great hairy Troll” over at the neighbors. I’ve been taking Vitamin D3 gummed since.
      BTW- Happy New Year all!

  7. Horse
    You gonna lead by example? LOL.!

    I really don’t wanna see that! LOL.! I’m so white, I would be almost invisible.!! You know, “white supremacist”, nope just kidding, I mean the last time my legs saw sunlight, I was a baby.

  8. As Ken said Zinc is important. Zinc needs a way into the cells. What is needed is an ionophore.
    Quercetin does this. It’s found in apple peels.
    A bit of vitamin A and and I to help things out.
    Doctor Robert Malone treated himself with Pepsid AC. The reference I saw was 10 tablets a day.

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