{"id":150,"date":"2026-08-05T09:00:00","date_gmt":"2026-08-05T09:00:00","guid":{"rendered":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/vitamin-d-how-much-is-actually-enough-in-winter\/"},"modified":"2026-08-05T09:00:00","modified_gmt":"2026-08-05T09:00:00","slug":"vitamin-d-how-much-is-actually-enough-in-winter","status":"publish","type":"post","link":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/vitamin-d-how-much-is-actually-enough-in-winter\/","title":{"rendered":"Vitamin D: how much is enough in a Boston winter?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Taking vitamin D blind is common and mostly harmless, but testing first tells you the right dose, and whether you need one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aug 5, 2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5 min read<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dr. Rohan Desai<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From October to March, anyone living above about 40\u00b0 latitude, Boston included, makes almost no vitamin D from sunlight. Summer stores drain through the winter, and by February many people are genuinely low.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The number worth knowing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">We aim for 25-hydroxyvitamin D above 30 ng\/mL, ideally between 40 and 60. Under 20 is a deficiency worth treating properly. Over 100 is not better; it pushes calcium up and adds nothing useful.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dose follows the result<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Someone at 18 ng\/mL needs a different plan from someone at 34, and body weight changes both. That is the case for testing before supplementing: the same capsule does very different things in two people.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recheck twelve weeks after you start. If the number hasn\u2019t moved, the problem is absorption rather than dose, and that is worth looking into.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Dr. Rohan Desai<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Internal medicine, Tinsdale<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Taking vitamin D blind is common and mostly harmless, but testing first tells you the right dose, and whether you need one.<\/p>\n","protected":false},"author":1,"featured_media":77,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-150","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biomarkers"],"_links":{"self":[{"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/posts\/150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/comments?post=150"}],"version-history":[{"count":0,"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/posts\/150\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/media\/77"}],"wp:attachment":[{"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/media?parent=150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/categories?post=150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/demo.iamavi.com\/portfolio\/tinsdale-health\/wp-json\/wp\/v2\/tags?post=150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}