![COVID-19 mortality risk correlates inversely with vitamin D3 status, and a mortality rate close to zero could theoretically be achieved at 50 ng/ml 25(OH)D3: Results of a systematic review and meta-analysis COVID-19 mortality risk correlates inversely with vitamin D3 status, and a mortality rate close to zero could theoretically be achieved at 50 ng/ml 25(OH)D3: Results of a systematic review and meta-analysis](https://www.medrxiv.org/content/medrxiv/early/2021/09/25/2021.09.22.21263977/F1.large.jpg)
COVID-19 mortality risk correlates inversely with vitamin D3 status, and a mortality rate close to zero could theoretically be achieved at 50 ng/ml 25(OH)D3: Results of a systematic review and meta-analysis
![Synthesis of 1α-Hydroxyvitamin D5 Using a Modified Two Wavelength Photolysis for Vitamin D Formation | The Journal of Organic Chemistry Synthesis of 1α-Hydroxyvitamin D5 Using a Modified Two Wavelength Photolysis for Vitamin D Formation | The Journal of Organic Chemistry](https://pubs.acs.org/cms/10.1021/jo050853f/asset/images/large/jo050853fn00001.jpeg)
Synthesis of 1α-Hydroxyvitamin D5 Using a Modified Two Wavelength Photolysis for Vitamin D Formation | The Journal of Organic Chemistry
![Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight | Scientific Reports Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-017-11362-2/MediaObjects/41598_2017_11362_Fig1_HTML.jpg)
Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight | Scientific Reports
![Physical Determinants of Vitamin D Photosynthesis: A Review - Neville - 2021 - JBMR Plus - Wiley Online Library Physical Determinants of Vitamin D Photosynthesis: A Review - Neville - 2021 - JBMR Plus - Wiley Online Library](https://asbmr.onlinelibrary.wiley.com/cms/asset/ae135337-7efd-45e2-bad9-46cd5550070f/jbm410460-fig-0001-m.jpg)
Physical Determinants of Vitamin D Photosynthesis: A Review - Neville - 2021 - JBMR Plus - Wiley Online Library
![Reverse phase high-performance liquid chromatography (RP-HPLC) system for analysis of vitamin D3 soft capsules with soybean oil matrix Reverse phase high-performance liquid chromatography (RP-HPLC) system for analysis of vitamin D3 soft capsules with soybean oil matrix](http://jms.fudan.edu.cn/fileup/HTML/PIC/fdxbyxb-46-1-23-3.jpg)
Reverse phase high-performance liquid chromatography (RP-HPLC) system for analysis of vitamin D3 soft capsules with soybean oil matrix
![Figure 4 from Generation of previtamin D 3 from tachysterol 3 : a novel approach for producing vitamin D 3 in the winter | Semantic Scholar Figure 4 from Generation of previtamin D 3 from tachysterol 3 : a novel approach for producing vitamin D 3 in the winter | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/cf179d2fdae2ab449cbaa8d6f60dd447f6dc7e5c/26-Figure4-1.png)
Figure 4 from Generation of previtamin D 3 from tachysterol 3 : a novel approach for producing vitamin D 3 in the winter | Semantic Scholar
Vitamin D and SARS-CoV2 infection, severity and mortality: A systematic review and meta-analysis | PLOS ONE
![A revised action spectrum for vitamin D synthesis by suberythemal UV radiation exposure in humans in vivo | PNAS A revised action spectrum for vitamin D synthesis by suberythemal UV radiation exposure in humans in vivo | PNAS](https://www.pnas.org/cms/10.1073/pnas.2015867118/asset/dacb2b2c-213e-40f8-81de-92fec454f0b9/assets/images/large/pnas.2015867118fig01.jpg)
A revised action spectrum for vitamin D synthesis by suberythemal UV radiation exposure in humans in vivo | PNAS
![Chromatogram of vitamin D, detected by UV detector at a wavelength of... | Download Scientific Diagram Chromatogram of vitamin D, detected by UV detector at a wavelength of... | Download Scientific Diagram](https://www.researchgate.net/publication/270857108/figure/fig1/AS:267421193863206@1440769589438/Chromatogram-of-vitamin-D-detected-by-UV-detector-at-a-wavelength-of-265nm-A-and-C.png)
Chromatogram of vitamin D, detected by UV detector at a wavelength of... | Download Scientific Diagram
![The measurement of vitamin D metabolites: part I—metabolism of vitamin D and the measurement of 25-hydroxyvitamin D | SpringerLink The measurement of vitamin D metabolites: part I—metabolism of vitamin D and the measurement of 25-hydroxyvitamin D | SpringerLink](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs42000-019-00169-7/MediaObjects/42000_2019_169_Fig2_HTML.png)
The measurement of vitamin D metabolites: part I—metabolism of vitamin D and the measurement of 25-hydroxyvitamin D | SpringerLink
![Vitamin D Production after UVB Exposure Depends on Baseline Vitamin D and Total Cholesterol but Not on Skin Pigmentation - ScienceDirect Vitamin D Production after UVB Exposure Depends on Baseline Vitamin D and Total Cholesterol but Not on Skin Pigmentation - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0022202X15347035-gr6.jpg)