The Dark Side of Vitamin D & the REAL Problem in Winter

EPISODE · Dec 24, 2025 · 47 MIN

The Dark Side of Vitamin D & the REAL Problem in Winter

from The Evolving Wellness Podcast with Sarah Kleiner Wellness · host Sarah Kleiner

In this episode of the Evolving Wellness Podcast, I delve into the complexities of vitamin D and melatonin, particularly during the winter months. I discuss the natural decline of vitamin D levels in winter, the critical role of melatonin, and how modern lifestyles disrupt these hormonal balances. The conversation covers the impact of stress, alcohol, and blue light on health, the importance of circadian rhythms, and the potential benefits and drawbacks of vitamin D supplementation. Links: Become a substack subscriber & get early access to podcasts + free courses - https://open.substack.com/pub/sarahkleinerwellness/p/uvbred-light-protocol?r=5eztl9&utm_campaign=post&utm_medium=web&showWelcomeOnShare=trueHoliday Sale - https://www.sarahkleinerwellness.com/SKW-holidayFree Webinar - https://www.sarahkleinerwellness.com/mycircadianapp-free-webinarTimestamps:00:00 Introduction to Vitamin D and Melatonin02:47 Understanding Seasonal Changes in Vitamin D Levels06:13 The Role of Melatonin in Winter Health09:00 Impact of Modern Lifestyle on Vitamin D and Melatonin11:51 The Effects of Stress and Alcohol on Hormonal Balance15:08 Circadian Rhythms and Their Importance17:51 The Dangers of Blue Light and Sleep Disruption21:07 Winter Infections and Their Impact on Vitamin D23:59 Pros and Cons of Vitamin D Supplementation27:13 Understanding Individual Variability in Vitamin D Metabolism29:52 Short-Term Vitamin D Supplementation: When Is It Appropriate?33:14 The Importance of Comprehensive Testing and Monitoring36:01 Conclusion and Future DirectionsReferences & further reading:Article: You’ve been warned about sunlight but not about supplements - http://sarahkleinerwellness.com/blog/you-ve-been-warned-about-sunlight-but-not-supplementsArticle - Can vitamin D supplements lower your melatonin? https://sarahkleinerwellness.substack.com/p/can-vitamin-d-supplements-lower-yourManson et al. VITAL primary outcomes. N Engl J Med. 2019. PMID: 30415629Sanders et al. Annual high-dose D ↑ falls/fractures. JAMA. 2010. PMID: 20157135Bischoff-Ferrari et al. Monthly high-dose D ↑ falls. JAMA Intern Med. 2016. PMID: 26747333Jackson et al. WHI Ca+D ↑ kidney stones. N Engl J Med. 2006. PMID: 16481635Slominski et al. Melatonin, mitochondria & skin photobiology. Cell Mol Life Sci. 2020.Hamblin MR. Anti-inflammatory photobiomodulation. AIMS Biophys. 2017.Deng et al. Magnesium, vitamin D status & mortality (NHANES). BMC Med. 2013.Holick et al. Translocation of cutaneous vitamin D₃. Endocrinology. 1994.This video is not medical advice & as a supporter to you and your health journey - I encourage you to monitor your labs and work with a professional!________________________________________Get all my free guides and product recommendations to get started on your journey!https://www.sarahkleinerwellness.com/all-free-resourcesCheck out all my courses to understand how to improve your mitochondrial health & experience long lasting health! (Use code PODCAST to save 10%) - https://www.sarahkleinerwellness.com/coursesSign up for my newsletter to get special offers in the future! -https://sarahkleinerwellness.kit.com/profile?_gl=1*1gs7n29*_gcl_aw*R0NMLjE3NjQwOTIxNjcuQ2owS0NRaUF4SlhKQmhEX0FSSXNBSF9KR2poSEZxTTl0blpDSEl4SjYyRHdpa1FuNGc3QXplVll4NVktSFhmSFZZamEwVDAtcU92YXlfQWFBbHp0RUFMd193Y0I.*_gcl_au*MTgwMTYwMTMxMi4xNzYzMzIwODkyLjYyODE4ODI3NC4xNzY1NTA5NjM3LjE3NjU1MDk2MzY.Free Guide to Building your perfect quantum day (start here) -https://www.sarahkleinerwellness.com/opt-in-9d5f6918-77a8-40d7-bedf-93ca2ec8387fMy free product guide with all product recommendations and discount codes:https://www.canva.com/design/DAF7mlgZpJI/xVyE4tiQFEWJmh_Xwx8Kbw/view?utm_content=DAF7mlgZpJI&utm_campaign=designshare&utm_medium=link2&utm_source=uniquelinks&utlId=h0782b52987

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The Dark Side of Vitamin D & the REAL Problem in Winter

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