Topic
Vitamin D
Vitamin D is a recurring research topic on Health Canon. This hub collects related explainers and protocols, newest first, each with evidence grades and practical decision frameworks.
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Light & Recovery
Sunlight and Vitamin D: A Decision Guide (2026)
Latitude, season, skin, and labs first—then sun, food, and supplements without tanning extremism.
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Women's Health
Sex Differences in Vitamin D: Pregnancy, Body Composition, Behavior, and Bone
Sex patterns in 25(OH)D arise from adiposity, clothing, outdoor work, pregnancy demands, and postmenopausal bone risk—not mystical male/female UV chemistry. ES 2024 gives pregnancy empiric D suggestions.
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Light & Recovery
Sun Exposure, Vitamin D, and Population Mortality: Cohorts vs VITAL Reality
Swedish sun-avoidance cohorts associate with higher mortality—confounded. VITAL found no primary CVD/cancer benefit from 2000 IU vitamin D in general adults. UV remains a proven carcinogen.
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Light & Recovery
Latitude, Season, and UV Index: When Sunlight Makes Vitamin D—and When It Does Not
Vitamin D winter is real at high latitudes. UVI guides burn protection (≥3). Bright visible light ≠ adequate UVB for cutaneous D3.
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Light & Recovery
Indoor Lifestyle Costs: Vitamin D Gaps Plus Circadian Light Deficiency
Modern indoors deliver a double hit: weak UVB for vitamin D and weak daytime melanopic light plus evening screen excess. Mitigate with morning outdoor light, workplace daylight, oral D when indicated—not tanning beds.
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Light & Recovery
Sunlight and Vitamin D Guidelines: WHO, AAD, and Endocrine Society 2024 Compared
Compatible stack: protect skin (WHO/AAD), no intentional UV for vitamin D (AAD), empiric oral D for selected groups without routine screening in healthy adults (ES 2024).
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Light & Recovery
Safe Sunlight Exposure Patterns: Vitamin D, UV Index, and Protection Balance
You cannot prescribe universal “minutes for vitamin D.” UV dose depends on latitude, season, skin, time, and area exposed. AAD rejects intentional UV for D; oral D is an option.
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Light & Recovery
Windows and Glass: UV Filtering, Vitamin D, and UVA Leak
Ordinary glass blocks UVB (no vitamin D). UVA often still gets through.
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Light & Recovery
Vitamin D: Sunlight Synthesis vs Supplements—What Authorities Prefer
UVB makes cutaneous D₃—but AAD and Endocrine Society 2024 favor oral repletion over intentional UV for endocrine goals.
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Light & Recovery
Sunlight Benefits and Risks: A Photobiology Balance Guide
Vitamin D, circadian light, UVA vascular claims, and cancer risk—pathway by pathway, without tan-for-health myths.
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