Winter Vitamin D Levels

Rebecca Stuart • December 10, 2025

Why you Feel Different When the Sun Disappears


The Vitamin D Hack That Changed Everything for My Family (And Why Winter Wrecks Your Levels)


Most people don’t think about their Vitamin D levels until something feels “off.”
Low energy. Mood dips. Getting sick more often. Hair shedding. Hormone chaos.


I lived that cycle for years — even though I thought I was doing everything right.


I used to take 5,000 IU of Vitamin D every single day without fail.
My family took it too.
We were consistent. We were diligent. We were the Supplement Family.

And yet… our blood levels stayed stuck in the low 20s ng/mL.
No matter the brand.
No matter the dose.
No matter the season.


It was so frustrating — until I discovered a simple shift that finally moved our levels into the optimal range (and kept us there).


This blog breaks down:

  • Why most people stay deficient even when supplementing
  • Why winter sends your Vitamin D levels into a freefall
  • The surprising truth about how little Vitamin D your skin makes in cold months
  • The one absorption hack that finally changed everything for our family

Let’s dive in.


Vitamin D’s Job Never Changes — But Your Levels Do


One of the biggest misconceptions is that Vitamin D has “different roles” in summer versus winter.

Not true.


Vitamin D performs the exact same functions all year long, including:

  • Supporting the immune system
  • Regulating mood and brain health
  • Helping balance hormones
  • Reducing inflammation
  • Strengthening bones and teeth
  • Improving muscle function
  • Supporting insulin sensitivity
  • Regulating over 3–5% of human genes

Its job description stays the same.  What does change dramatically? Your blood levels.

And that changes everything about how your body functions.


Why Summer Boosts Your Vitamin D Naturally


In summer, your body is a Vitamin D–making machine.

With just 10–30 minutes of smart midday sun, your skin can produce:

  • 10,000–25,000 IU of Vitamin D
  • Without supplements
  • Without effort


This is why many people naturally reach 40–80 ng/mL in the warm months — the range where most people feel their best: stronger immunity, fewer seasonal mood dips, better recovery, easier weight management, and improved hormone health. From experience, my family and clients typically feel the best in the 75-90 ng/mL range


Sunlight is powerful medicine.

But there’s a catch…


Why Winter Drains Your Vitamin D Tank (Even If You Supplement)


From October to April, especially above 37° latitude, the sun is simply too weak for your skin to make meaningful Vitamin D.

You could stand outside nude for hours and still make virtually none. WHAT!?! WHY!?!


- The UVB rays that make vitamin D are very weak or absent when the sun is low on the horizon (zenith angle >45°).

- Glass windows block 100% of UVB (so sitting by a window does nothing).

- Cold air + heavy clothing = almost no skin exposed anyway.

- Darker skin tones (Fitzpatrick type IV–VI) need 5–10× longer exposure and still get almost nothing in winter above 37° N.


Some Real-World Numbers from Studies

- Boston (42° N), January, midday, face + hands exposed: ~100–200 IU/hour at best (vs 10,000–20,000 IU in 15–20 min of summer sun).

- Edmonton, Canada (52° N), November–February: literally 0 IU measurable from sun, even with short sleeves outdoors for an hour.


Bottom Line for Winter Vitamin D from Sun

- If you live in the continental U.S., Canada, or Europe: Don’t count on the sun at all from November through February/March.

- The only reliable winter sources are:

 - Supplements (D3) --maybe..

 - Fatty fish / fortified foods (small contributions)

 - UV lamps (tanning beds or medical UVB lamps — but most people don’t use them correctly)


So unless you’re spending winter in southern Florida, Arizona, or farther south — your body is 100% dependent on stored vitamin D (from summer) and whatever you swallow until spring arrives.


So in the Winter as a result, Vitamin D levels often drop to:

  • 15–30 ng/mL


This drop is strongly linked with:

  • More viral infections
  • Seasonal depression (SAD)
  • Fatigue
  • Achy joints
  • Low immunity
  • Slower metabolism (winter weight gain or weight loss resistance)
  • Hormonal imbalance


Why High-Dose Pills Often Fail


This was my story for years.

We took the pills.
We checked the labels.
We increased the dose.
We tried different brands.
We stayed consistent.

And still… nothing.


Here’s why:

Most Vitamin D capsules rely on intestinal absorption, meaning:

  • If you have gut inflammation, low bile, poor fat absorption, or liver sluggishness, your levels simply will not rise. (My family has mold illness so yeah, we had that beautiful variable working against us.)
  • As we age, we also absorb less.
  • Around 35% of people have genetic variations that make them low responders to oral D3.


So even though we were taking Vitamin D every day, almost none of it was actually getting into our bloodstream.


The One Hack That Finally Moved Our Vitamin D Levels


After years of puzzling labs, we switched to:

Nano Ojas Everyday Wellness Spray

And within 8–12 weeks, our family had labs in the 85–95 ng/mL range.


For the first time ever, we saw real results.


Why the spray worked when pills didn’t:


I could take you down a long list of studies and explanations but to be honest it's December and I am trying to work smarter not harder so -

Check out the science here and here and here


Here is a quick excerpt from Nano-Ojas


      **  Metadichol (the active main ingredient in Nano Ojas) has been shown to increase vitamin D levels in the body without having to directly         introduce a vitamin D supplement. This works because Metadichol acts on nuclear receptors, which are found in the nucleus of every cell and contain the software necessary for homeostasis. The result is that Metadichol helps to support healthy vitamin D levels and regulate many essential biological processes including development, metabolism, reproduction, and immune system function.

Research has demonstrated that Metadichol can activate enzymes, stimulate gene expression related to cell repair, and promote healthier skin tissue growth. Its process is truly unique in the body.

  • By binding to vitamin D receptors (VDR), Metadichol offers therapeutic benefits of vitamin D3 and helps restore proper immune functions and improve overall health and recovery.
  • Bacteria and viruses often bind to VDRs, or the receptors responsible for our innate immunity, to trigger a response in the body. Metadichol competes by binding to vitamin D receptors, displacing the bacteria or virus, and enabling normal functioning of the immune system. **


 

For the first time ever, our levels stay solid all winter long—and honestly, we just feel better.

 More energy. Better mood. Fewer bugs. Better sleep. Less inflammation. Everything.


This is a total game-changer for “low absorbers,” which was clearly us.


How to Know If Your Vitamin D Is Low


Common winter Vitamin D deficiency symptoms include:

  • Feeling tired even with a full night’s sleep
  • Mood drops or seasonal depression
  • More colds/viruses
  • Muscle weakness or achy joints
  • Brain fog
  • Slow recovery after workouts
  • Hair shedding
  • Hormonal ups and downs

If this sounds like you, it might be time to test.


Your Next Steps:

1. Ask your doctor for a 25(OH)D blood test.

Optimal (not just “normal”) is:

  • 80–100 ng/mL (or 200–250 nmol/L)

Anything under 50 may be hindering your health more than you realize.

2. Consider using Nano Ojas.

If pills haven’t moved your levels, this spray may help massively.  Get it here and use coupon code LIBERTY for 15% your first purchase!


Final Thoughts: Your Winter Wellness Depends on Your Levels


Vitamin D fuels nearly every system in your body — immune function, mood, hormones, metabolism, inflammation, and more.


If you want:

  • Better energy
  • Fewer colds
  • Better mood
  • Reduced inflammation
  • Stronger hormones
  • More stable blood sugar
  • Bust that weight loss stall


Vitamin D is one of the simplest, most profound places to start.


This winter, give your body what it needs to thrive. Your future self will thank you.


Still not satisfied with information I have provided about Nano Ojas then listen to my interview with the Company Execs on my podcast!

Click here to listen/watch! How Nano Ojas was Born: A Story o fHope, Healing, & Purpose


 Keyword List

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  • seasonal affective disorder vitamin D
  • low vitamin D winter months
  • vitamin D immune system
  • vitamin D mood support
  • vitamin D sunlight
  • winter fatigue causes
  • how much vitamin D do I need
  • vitamin D levels summer vs winter


This blog post has not been reviewed or approved by the FDA and is for educational purposes only. Always consult your personal practitioner before making any health changes. Also, ask them to see if checking Vitamin D is right for you! I would be surprised if they said no.



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