vitd-sunMYCIN kept an explanation facility because a rule you cannot inspect is a rule you cannot argue with. This is that facility.
Vitamin D — strength 0.5 on a scale where 1.0 would be certainty, which no rule here reaches or claims.
Skin synthesis from midday sun is the main source for most people; months without it is the main route to deficiency.
Educational only. This is a frame for thinking about food, not medical or dietary advice, and it does not replace a clinician or a pharmacist. Where a state names a drug interaction, the mechanism and its citations live in interactions-data.mjs — read those before relying on any of it.
This is a screener, not a diagnosis, and it cannot establish any medically determinable impairment. It produces a list of questions and specific tests to bring to a clinician. Nothing here is a finding, a clearance, or a result. If any page renders this as a conclusion about a person, that page is wrong.