Sunlight: Optimize Health and Immunity (Light Therapy and Melatonin)

Sunlight: Optimize Health and Immunity (Light Therapy and Melatonin)
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Sunlight provides so much more than just Vitamin D:

learn from Dr. Seheult of about the myriad of benefits from optimizing our exposure to light. Roger Seheult, MD is the co-founder and lead professor at

He is Board Certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine and an Associate Professor at the University of California, Riverside School of Medicine.

This video was recorded on January 21, 2022


0:00 Intro

6:50 The solar spectrum

13:00 Circadian rhythm highlights and chart

15:15 What is regulated by circadian rhythm

16:30 Circadian dysregulation

22:30 Circadian master clock

26:41 Blue blockers

29:15 Light & mood regulation & seasonal affective disorder

31:14 Dawn simulation light and light therapy box demo

35:45 Light & cortisol 38:15 Melatonin from the pineal gland

42:00 Morning dos and don’ts 44:00 Evening dos and don’ts

48:30 Mitochondria & melatonin 49:45 Melatonin night AND day

51:00 Details of melatonin production 59:00 Melatonin summary

1:02:30 Infrared radiation 1:20:45 Sun exposure & melanoma risk

1:26:00 Sunlight penetrates bone & brain 1:29:00 Sun exposure and Covid-19

1:40:00 Infrared inhibited by glass

1:43:00 Infrared summary

1:53:00 Summary & tips

LINKS / REFERENCES: The Relationship Between Lux, Lumen and Watt (Tachyon) | Infrared and skin: Friend or foe (Science) | Melatonin as a potential anticarcinogen for non-small-cell lung cancer (Oncotarget) | The efficacy of light therapy in the treatment of mood disorders (AJP) | Adj. Bright Light Therapy for Bipolar Depression (AJP) | Effects of artificial dawn on subjective ratings of sleep inertia and dim light melatonin onset (Chronobiology Int) | Effects of Artificial Dawn and Morning Blue Light... (Chronobiology Int) | Circadian rhythms in the hypothalamo-pituitary-adrenal (HPA) axis (MCE) | Reduced cancer incidence among the blind (Epidem) | Evening use of light-emitting eReaders negatively affects sleep (PNAS) | Ocular input for human melatonin regulation (NEL) | Melatonin and the Optics of the Human Body (Melatonin) | Melatonin in Mitochondria (APS) | Opportunities.. of Fluorescent Carbon Dots (CPD) | The health benefits of the great outdoors (Environ) | Interplay between up-regulation of cytochrome-c-oxidase (Nature) | Red/Near Infrared Light Stimulates Release of an Endothelium Dependent Vasodilator (FRBM) | Effect of daylighting on student health (CMSE) | Shining the Light on Sunshine (Clinical Endo) | Associations of Outdoor Temperature (JCEM) | Relationship between sun exposure and melanoma risk (EJC) | We cannot post all links and references here (due to video description length limitations) but will post them at the MedCram Blog: All Dr. Seheult's videos are at (including more discussion on red light therapy, infrared light benefits, what is melatonin, etc.) SUBSCRIBE TO THE MEDCRAM YOUTUBE CHANNEL: Get notified of new videos by hitting the bell icon. MEDIA CONTACT: Media Contact: Media contact info: Video Produced by Kyle Allred Thanks to Amanda Taylor, PA-C FOLLOW US ON SOCIAL MEDIA: DISCLAIMER: MedCram medical videos are for medical education and exam preparation, and NOT intended to replace recommendations from your doctor. #sunlight #covid19 #melatonin