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

24 Dec 2025 • 47 min • EN
47 min
00:00
47:27
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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=true Holiday Sale - https://www.sarahkleinerwellness.com/SKW-holiday Free Webinar - https://www.sarahkleinerwellness.com/mycircadianapp-free-webinar Timestamps: 00:00 Introduction to Vitamin D and Melatonin 02:47 Understanding Seasonal Changes in Vitamin D Levels 06:13 The Role of Melatonin in Winter Health 09:00 Impact of Modern Lifestyle on Vitamin D and Melatonin 11:51 The Effects of Stress and Alcohol on Hormonal Balance 15:08 Circadian Rhythms and Their Importance 17:51 The Dangers of Blue Light and Sleep Disruption 21:07 Winter Infections and Their Impact on Vitamin D 23:59 Pros and Cons of Vitamin D Supplementation 27:13 Understanding Individual Variability in Vitamin D Metabolism 29:52 Short-Term Vitamin D Supplementation: When Is It Appropriate? 33:14 The Importance of Comprehensive Testing and Monitoring 36:01 Conclusion and Future Directions References & 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-supplements Article - Can vitamin D supplements lower your melatonin? https://sarahkleinerwellness.substack.com/p/can-vitamin-d-supplements-lower-your Manson et al. VITAL primary outcomes. N Engl J Med. 2019. PMID: 30415629 Sanders et al. Annual high-dose D ↑ falls/fractures. JAMA. 2010. PMID: 20157135 Bischoff-Ferrari et al. Monthly high-dose D ↑ falls. JAMA Intern Med. 2016. PMID: 26747333 Jackson et al. WHI Ca+D ↑ kidney stones. N Engl J Med. 2006. PMID: 16481635 Slominski 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-resources Check 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/courses Sign 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-93ca2ec8387f My 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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