My Week Fixing Vitamin D Deficiency
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*I never thought my vitamin D levels could be so low until my blood test shook me; this week, I’m diving into how I fixed it—and what surprised me most.*
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My Week Fixing Vitamin D Deficiency

- The first few weeks felt like a blur; my body adjusted without much notice.
- My mood changed subtly before I noticed an increase in energy levels.
- Timing became more critical than anticipated, affecting how my immune system responded to stressors.
It took me three weeks to realize I was taking zinc exactly the wrong way. My energy levels were flatlining by noon, and my focus felt like it was swimming in molasses. I'd been following a popular routine online, but something just wasn't clicking. Maybe it was the timing? Or maybe I needed a different type of zinc altogether? The frustration is building with each passing day.
How I Eat Differently Now

I started spending more time near windows during lunch. Not just for fresh air, but because I'd read that UVB rays could help with vitamin D synthesis. At first, it felt weird—bright light hitting my face, like sitting too close to a screen—but after a week, I noticed something. When I did spend 20 minutes outside, my mood felt steadier. Maybe coincidence? Probably not.
I cut out late-night snacking. Not because they're bad for teeth or anything—though that's true—but because my sleep would feel fragmented if I ate too close to bed. Instead, I packed more breakfast into my routine. Taking vitamin D with my first meal felt like a mistake at first. It made me feel sluggish, like I'd eaten too much fat. But when I switched to taking it earlier with lighter food? The absorption felt better, even when I couldn't measure it.
I started cooking more with fatty foods. Not because I wanted to be healthy, but because I learned fat helps vitamin D absorb better. Dishes with olive oil, avocado, and fatty fish became my go-to. Sometimes I'd overdo it—too much oil—and my stomach would feel off for hours. But when I kept portions reasonable, the supplements didn't upset my stomach as much.
The work trip messed everything up. For nine days, I forgot to pack my supplements or packed them and left them in a suitcase. By the time I remembered, I could feel the difference in my energy levels. No data points there, but I noticed the fog creeping back. Still, the weird thing was how my body reacted when I got back on track. The grogginess lifted faster than expected, but it took days rather than hours.
I tried adding more vitamin D-rich foods—salmon, egg yolks, fortified milks—but my budget rebelled. I noticed the cost adding up after every grocery trip. Maybe the supplements were more cost-effective? I stopped and started again with a focus on whole foods instead. That worked better, though it didn't feel like a complete replacement for direct sun exposure.
Sometimes I'd skip my morning dose on purpose. Not because I was testing anything but because I thought my body would adjust to lower amounts. It didn't. My mood dipped so low I couldn't even focus without feeling cloudy. So I stopped skipping and went back to daily supplementation. The difference? No more mid-afternoon crashes.
I still don't know if it's the supplements or something else. Maybe the weather, maybe stress, maybe my body just needed time. But every time I think about that trip, I remember how long it took to feel normal again. I noticed patterns—like the way my energy felt steadier when I paired supplements with meals containing fat.
I'm not sure if I'll keep doing this forever. Maybe next month I'll slack off on tracking. But for now? The supplements are still in my morning routine, and I'm still scheduling walks outside. Just in case.
How Long Until I Felt a Difference
Weeks went by without anything changing. I kept catching colds—three in the first month alone—and my body never seemed to fight them off faster than usual. My friend Sarah said she'd started taking a vitamin D supplement after her doctor warned about winter immunity, but I didn't think it mattered much. We both got sick around the same time, and hers cleared up quicker. Maybe she was just luckier, or maybe there was something in that pill I wasn't getting.
By month two, though, I noticed small things. The first cold of the season hit harder than usual—feverish for three days, coughing so bad it woke me up at night—but when it finally broke, my energy came back faster than before. I told myself it was just coincidence. Then there was that time I skipped a dose by accident and got sick two days later. It wasn't a big deal, but the timing felt weirdly precise.
I started tracking things more carefully, like how long symptoms lasted or whether my nose stayed stuffy after recovery. Some weeks, I'd wake up with a sore throat and feel tired for hours. Other times, I'd brush it off as just fatigue from work. It was inconsistent enough that I couldn't tell if anything real was happening—or if I was just overthinking.
The turning point came in the fourth month. A cold hit midweek, and this time my body didn't shut down. I stayed up late working on a project instead of collapsing into bed. The fever broke by Thursday, and by Friday I felt like myself again. It wasn't dramatic, but it was enough to make me wonder if something had shifted. I asked Sarah about her experience, and she shrugged. "I've been doing this for years," she said. "You just have to keep taking it."
Sometimes the changes were so subtle they felt like noise. Like when my throat didn't burn as much after a late-night meal or when I woke up with less congestion than usual. But over four months, those small moments added up. I wasn't dramatically different, but I wasn't the same either. My body had quietly rebuilt something I hadn't realized was broken.
Referenced research: PMID 20542256 | PMID 28709534 | PMID 29747546
Day 4: The 3pm Crash That Suddenly Didn't Happen
By Wednesday, something shifted. Usually around 3pm, I'd hit a wall so hard I'd need coffee just to function. But this week, that crash never came. I was taking 2,000 IU of vitamin D3 each morning with a splash of olive oil to help absorption, as my doctor had suggested. I also sat outside for 20 minutes around 8:30am, when the sun wasn't too harsh but still strong enough to actually do something. I noticed I was waking up easier too—no more snooze button marathons.
My at-home vitamin D test kit arrived on Thursday. Before starting supplements, my level was 18 ng/mL, which is technically deficient. After just four days of my routine, I ran it again and saw 22 ng/mL. That's not a huge jump, but for such a short window, I was surprised. The package said optimal ranges start around 30 ng/mL, so I clearly have work to do, but this gave me real motivation to keep going.
By day four, I moved my lunch break from 1pm to 12:30pm and sat on the bench outside for twenty minutes. My skin stayed pale but I felt warmth I hadn't noticed in months. That afternoon I didn't need a third coffee to push through a 3pm slump, which hadn't happened since January.
My doctor ran labs on a Tuesday. She called Thursday with results: my level jumped from 18 ng/mL to 32 ng/mL. Still not optimal by some standards, but a 14-point climb in seven days. She suggested cutting supplementation to every other day and maintaining sun habits. I finally understood why I'd been dragging through winter.
Related reading: My Magnesium Honest Experiment: Unfiltered Notes | I Took Magnesium to Fix My 3am Waking — Honest Notes | Magnesium Vitamin Benefits, Dosage, and Side Effects | Magnesium types and dosage: The Form That Finally Worked for Me
Also in my other logs:
- The Best Eating Window for 16:8 Fasting — What Worked for Me (My Fasting Log)
- My Morning Ritual: 90 Days of Matcha Instead of Coffee (My Matcha Log)
- What Eating Fermented Foods Every Day Did to My Digestion (My Gut Health Log)
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