Professor Roger Seheult, MD explains the important role Vitamin D may have in the prevention and treatment of COVID-19. Dr. Seheult is the lead professor at
Dr. Seheult illustrates how Vitamin D works, summarizes the best available data and clinical trials on vitamin D, and discusses vitamin D dosage recommendations.

Roger Seheult, MD is Co-Founder of MedCram and an Associate Professor at the University of California, Riverside School of Medicine and Assistant Prof. at Loma Linda University School of Medicine. He is Quadruple Board Certified: Internal Medicine, Pulmonary Disease, Critical Care, & Sleep Medicine

Interviewer: Kyle Allred, Producer & Co-Founder of


The National Human Activity Pattern Survey (NHAPS)… (J. of Exposure A. and Env. Epidem.) |

Aging decreases the capacity of human skin to produce vitamin D3 (The J. of Clin. Invest.) |

Racial differences in the relationship between vitamin D… (Osteoporosis Int.) |

Decreased bioavailability of vitamin D in obesity (The American J of Clin. Nutrition) |

Vitamin D Insufficiency and Deficiency and Mortality from Respiratory Diseases … (Nutrients) |

Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis… (BMJ) |

Randomized trial of vitamin D supplementation to prevent seasonal influenza A… (The American J.of Clin. Nutrition) |

Vitamin D and SARS-CoV-2 infection… (Irish J. of Med. Sci.) |

Factors associated with COVID-19-related death… (Nature) |

Editorial: low population mortality from COVID-19 … (Alimentary Pharm. & Therap.) |

The role of vitamin D in the prevention of coronavirus … (Aging Clin. & Exper. Res.) |

25-Hydroxyvitamin D Concentrations Are Lower in Patients with … SARS-CoV-2 (Nutrients) |

Vitamin D deficiency in COVID-19: Mixing up cause and consequence (Metabolism) |

Low plasma 25(OH) vitamin D level… increased risk of COVID-19… (The FEBS J.) |

The link between vitamin D deficiency and Covid-19… |

SARS-CoV-2 positivity rates… with circulating 25-hydroxyvitamin D levels (PLOS One) |

Vitamin D status and outcomes for… COVID-19 (Post. Med. J.) |

Vitamin D Deficiency and Outcome of COVID-19… (Nutrients) |

“Effect of calcifediol treatment…” (J. of Steroid Bio. Molec. Bio.) |

Vitamin D and survival in COVID-19 patients… (J. of Steroid Bio. Molec. Bio.) |

Effect of Vitamin D3 … vs Placebo on Hospital Length of Stay…: A Multicenter, Double-blind, RCT |

Short term, high-dose vitamin D… for COVID-19 disease: RCT [SHADE study] (Postgrad. Med. Journal) |

Association of Vitamin D Status… With COVID-19 Test Results (JAMA Network Open) |

Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline (JCEM) |

Vitamin D Fortification of Fluid Milk … A Review (Nutrients) |

Analysis of vitamin D level among asymptomatic and critically ill COVID-19 patients… (Scientific Reports from the Journal Nature) |


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  1. MedCram - Medical Lectures Explained CLEARLY

    The professor featured in this video (Roger Seheult, MD) has videos on over 60 other medical topics at
    PLEASE NOTE: Dr. Seheult says in this video “I can’t tell you how much vitamin D to take because I’m not your doctor nor am I here to give you medical advice.” As always, there may be risks with any supplement or medication, and a variety of individual factors (patient weight, underlying medical conditions, sunlight exposure, other vitamins that may enhance the impact of vitamin D etc.) should all be considered. We always recommend speaking with your individual medical professional before making changes to your vitamins or medications. Thank you for watching and for your comments!

    See other recent MedCram Interviews: Ventilate Your Home! Optimize Health with Prof. Joseph Allen:
    Coronavirus Mutations and Vaccine Implications with Prof. Shane Crotty, PhD:
    If You Get COVID 19 with Prof. Roger Seheult, MD: 10 Tips to Optimize Immune System:
    COVID 19 Vaccine Deep Dive: Safety, Immunity, RNA Production, w Shane Crotty, PhD:
    At Home COVID 19 Antigen Test Update with Prof. Michael Mina, MD

  2. Indira Tjongarero

    Wow. Very informative. Was very sleepy when I was listening to this video 😄 eyes closed but both ears wide open. I'm definitely sharing


    Since Dr John Cambell mentioned the importance of VD3 in early 2020 I started taking supplements even though I stay in SUNNY South Africa. In the first week I became sick with cold and running nose etc. Now lately I experience severe pains in my elbows almost like muscle pains or something? Yet Im good fisically and mentally?

  4. Rita Afrika

    This was very informative. I come from a country in Africa with sunlight throughout all year. Can I still consume Vitamin D daily? Is this the reason why most African country's covid death rate is low compared to other continents?

  5. Enova Enove

    Thank you for a great video! Looks like it was a tedious analysis. At 35 mins. I think the reason that females have lower vit d level is because they have naturally higher fat percentage than males.

  6. Charm C

    Thank you for taking the time to go through all of this information. It's helpful and much appreciated. 🙂

  7. Health and gardening

    Vitamin d works so well for me. I have a very poor immune system but thank god the doc put me on calcitriol because I wasn’t able to use the vitamin d properly in my body. My immune system works much better than it did before I got on calcitriol.

  8. Denise Lackmann

    This information is very important to take note and remember ZINC plus vitamin "C" and "B", Prebiotics and ginger. Vitamin D on all I have read is a NECESSITY for not only covid. This is very informative information to take into consideration.

  9. theyuha

    Which is the best vitamine D to take? Are there different kinds? One was mentioned with the element the kidney adds to the vitamine to make it active, what is that called in the marketplace?

  10. life is good

    One year ago I caught covid working in a health care facility,I went and got tested cause I had all the symptoms,my worse symptoms was dizzy.i live in Florida the sun was hot standing in these long lines.when I was done my dizziness went away ,I have vitamin difficency

  11. Dev

    If vitamin D plays such a big role then why are countries like India and Brazil being destroyed by Covid. We do get plenty sunlight throughout the year.

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