Evidence-based articles about vitamin D, sun exposure, and health optimization.
95 articles
Seasonal affective disorder and low vitamin D both peak in winter months. Here's what randomized trials and longitudinal data reveal about whether supplementing actually helps.
Low vitamin D appears consistently in people with psoriasis, and topical D analogues are already first-line treatment. Here's what trials and mechanistic data show about the systemic link.
Low vitamin D appears consistently alongside thyroid disorders, from Hashimoto's to hypothyroidism. Here's what trials and mechanistic data actually reveal.
The liver performs a critical step in vitamin D activation — and liver disease quietly disrupts it. Here's what the clinical evidence shows about 25(OH)D levels and liver function.
Night-shift nurses and ER workers face some of the lowest vitamin D levels in any occupation. Here's what the evidence shows and what to do about it.
Can you get vitamin D from the sun after 4 PM? The honest answer depends on your latitude, season, and UV index — not the clock. Here's what the data shows.
Large randomized trials, including VITAL, now show vitamin D supplementation cuts new autoimmune diagnoses by around 22%. Here's what the evidence actually says.
Shift workers have some of the lowest vitamin D levels in occupational research — and irregular sleep timing makes the problem worse. Here's what the evidence shows.
Taking D3 daily without K2 may move calcium into the wrong tissues. Here's what the evidence says about arterial calcification, bone quality, and when the combination actually matters.
People with obesity consistently test lower for vitamin D even with similar sun exposure. Here's what the sequestration evidence shows and how to close the gap.