Seasonal changes bring more than just cooler temperatures. As daylight decreases and the sun’s angle shifts, our natural ability to produce vitamin D drops significantly. Because the body depends on UVB rays to synthesize this essential nutrient, reduced sunlight exposure during the winter can make maintaining optimal vitamin D levels a real challenge.
Vitamin D plays a vital role in bone health, helping the body absorb calcium and phosphorus, both key components in maintaining strong bones. Studies also show a correlation between vitamin D deficiencies and compromised immunity. Having adequate levels of vitamin D during the winter months can help boost the body’s defenses as cold and flu season ramps up. Being proactive about vitamin D during the winter months can help mitigate the effects of less sunlight and help keep our bones and immune system healthy.
Here are some tips for maintaining vitamin D during winter months.
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Get outside when you can. Even a short walk or hike in the daylight can provide a valuable boost.
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Incorporate food sources. While limited, some foods naturally provide vitamin D. Fatty fish such as salmon and sardines, egg yolks, and mushrooms are excellent options. Many dairy products and plant-based alternatives are also fortified with vitamin D.
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Consider supplementation. Vitamin D3 supplements can be especially helpful during the winter months when sun exposure is scarce. MHP recently developed a liquid Vitamin D3 + K2 with A formula designed to enhance absorption and help keep vitamin D levels where they need to be.
As the days grow darker, giving your body the support it needs becomes even more important. Maintaining optimal vitamin D levels can make a noticeable difference in how you feel—helping you stay strong, energized, and resilient all winter long.
These statements have not been evaluated by the Food and Drug Administration.
References
- Stay Healthy This Fall and Winter: Why and How to Keep Your Vitamin D Levels Up. (2024). Welltech. https://welltech.com/content/stay-healthy-this-fall-and-winter-why-and-how-to-keep-your-vitamin-d-levels-up/
- Warren, H. (2023). Getting adequate vitamin D in the fall and winter. https://www.bcm.edu/news/getting-adequate-vitamin-d-in-the-fall-and-winter
- Vitamin D and Its Link to Immune Health. (2025). Science News Today. https://www.sciencenewstoday.org/vitamin-d-and-its-link-to-immune-health