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

Page: https://stenobird.com/podcast/the-evolving-wellness-podcast-with-sarah-kleiner-wellness-2136142/the-dark-side-of-vitamin-d-the-real-problem-in-winter
Text version: https://stenobird.com/podcast/the-evolving-wellness-podcast-with-sarah-kleiner-wellness-2136142/the-dark-side-of-vitamin-d-the-real-problem-in-winter.md
Podcast: [The Evolving Wellness Podcast with Sarah Kleiner Wellness](https://stenobird.com/podcast/the-evolving-wellness-podcast-with-sarah-kleiner-wellness-2136142)
Published: 2025-12-24T10:55:00+00:00
Episode link: https://podcasters.spotify.com/pod/show/sarahkleinerwellness/episodes/The-Dark-Side-of-Vitamin-D--the-REAL-Problem-in-Winter-e3ckc58
Audio file: https://anchor.fm/s/48b7c51c/podcast/play/112914024/https%3A%2F%2Fd3ctxlq1ktw2nl.cloudfront.net%2Fstaging%2F2025-11-20%2F414744477-44100-2-17f4fc117ad67.mp3
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Duration seconds: 2847

## Resource

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…

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