{"product_id":"nutra-bio-vitamin-d-5000-iu-90-caps","title":"NutraBio Vitamin D3 — 5,000 IU Per Capsule, 90 Capsules","description":"\u003ch2\u003eNutraBio Vitamin D3\u003c\/h2\u003e\n\u003cp\u003e5,000 IU of vitamin D3 (cholecalciferol) per capsule, 90 capsules. Single ingredient, no fillers.\u003c\/p\u003e\n\u003ch3\u003eThis is one of the few supplements where deficiency is genuinely widespread\u003c\/h3\u003e\n\u003cp\u003eWe are sceptical of most \"everyone is deficient\" claims. \u003cstrong\u003eVitamin D is the exception\u003c\/strong\u003e, and the reason is structural rather than dietary.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYour body makes vitamin D from sunlight\u003c\/strong\u003e — specifically UVB striking bare skin. Several things get in the way of that:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLatitude.\u003c\/strong\u003e Above roughly 37°N — which includes all of Pennsylvania — the sun sits too low from about October to March for meaningful UVB to reach the ground. You can stand outside all day in January and make almost none\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndoor life.\u003c\/strong\u003e Most people work indoors, and glass blocks UVB entirely\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSunscreen\u003c\/strong\u003e blocks the wavelength responsible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkin tone.\u003c\/strong\u003e Melanin is protective against UV, which also means darker skin requires substantially longer exposure to produce the same amount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAge.\u003c\/strong\u003e The skin's capacity to synthesise vitamin D declines over time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAnd food does not fill the gap.\u003c\/strong\u003e Very few foods contain meaningful vitamin D — oily fish, egg yolks and fortified dairy are essentially the list, and you would need to eat oily fish most days.\u003c\/p\u003e\n\u003ch3\u003eWhy it matters beyond bone health\u003c\/h3\u003e\n\u003cp\u003eVitamin D is usually filed under bone health, and that is real — it governs calcium absorption, and without it dietary calcium is largely wasted.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBut vitamin D functions more like a hormone than a vitamin.\u003c\/strong\u003e Receptors for it appear in tissues throughout the body, which is why the research spans:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImmune function.\u003c\/strong\u003e The most active area, and part of why deficiency is associated with more frequent respiratory infections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMuscle function and strength.\u003c\/strong\u003e Vitamin D receptors are present in muscle tissue, and deficiency is associated with weakness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTestosterone.\u003c\/strong\u003e Low vitamin D status is associated with lower testosterone — correcting a deficiency can help, though supplementing beyond sufficiency will not\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMood.\u003c\/strong\u003e The seasonal pattern of low mood overlaps closely with the seasonal pattern of vitamin D status\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e⚠ Three things worth knowing before you take it\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e1. It is fat-soluble, so take it with a meal containing fat.\u003c\/strong\u003e Taking vitamin D on an empty stomach or with a low-fat breakfast substantially reduces absorption. This is the most common mistake, and it is free to fix.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Consider pairing it with vitamin K2.\u003c\/strong\u003e Vitamin D increases calcium absorption; vitamin K2 helps direct that calcium into bone rather than soft tissue. The two are increasingly taken together for that reason, and at 5,000 IU it is worth considering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Test rather than guess.\u003c\/strong\u003e This is the one supplement where a blood test is genuinely worth it, because it is fat-soluble and stored in the body rather than excreted. 25-hydroxyvitamin D is a cheap, standard test. Sufficiency is generally cited above 30 ng\/mL, with many practitioners targeting 40–60.\u003c\/p\u003e\n\u003ch3\u003eOn the 5,000 IU dose\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e5,000 IU is a therapeutic dose, not a maintenance one.\u003c\/strong\u003e The RDA sits at 600–800 IU, and the tolerable upper intake level for adults is generally cited at 4,000 IU daily from all sources.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThat does not make 5,000 IU unreasonable\u003c\/strong\u003e — it is a very commonly used correction dose, and many people with confirmed deficiency are advised higher still. But it does mean two things:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt is worth confirming you are low\u003c\/strong\u003e rather than assuming\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCount your other sources.\u003c\/strong\u003e Multivitamins, fish oil products and greens powders frequently contain vitamin D\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVitamin D toxicity is rare but real\u003c\/strong\u003e, and because it accumulates, it comes from sustained very high intake rather than one large dose. Retesting after three months of supplementation is sensible.\u003c\/p\u003e\n\u003ch3\u003eD3 rather than D2\u003c\/h3\u003e\n\u003cp\u003eWorth knowing when comparing products. \u003cstrong\u003eD3 (cholecalciferol) is the form your skin produces\u003c\/strong\u003e and the form in animal foods. D2 (ergocalciferol) comes from plant and fungal sources.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eD3 raises and maintains blood levels more effectively than D2\u003c\/strong\u003e, which is the reason it is the standard choice. If a label says only \"vitamin D\", check which.\u003c\/p\u003e\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVitamin D3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5,000 IU (cholecalciferol) per capsule\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCapsules\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther ingredients\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone beyond the capsule\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLabel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFully disclosed, no proprietary blends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTesting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThird-party tested, published at checkmysupps.com\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eHow to take it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne capsule daily with a meal containing fat.\u003c\/strong\u003e This matters more than people realise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMorning or evening is fine\u003c\/strong\u003e, though some people find vitamin D late in the day affects sleep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery day.\u003c\/strong\u003e Levels build gradually over weeks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsider adding K2\u003c\/strong\u003e, particularly at this dose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetest after about three months\u003c\/strong\u003e and adjust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYou may need less in summer\u003c\/strong\u003e if you spend real time outdoors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAnyone living at northern latitudes through autumn and winter — that is all of Pennsylvania\u003c\/li\u003e\n\u003cli\u003ePeople who work indoors\u003c\/li\u003e\n\u003cli\u003eAnyone with darker skin, who needs substantially more sun exposure for the same synthesis\u003c\/li\u003e\n\u003cli\u003eOlder adults, whose skin synthesises less\u003c\/li\u003e\n\u003cli\u003ePeople with confirmed low vitamin D on a blood test\u003c\/li\u003e\n\u003cli\u003eAthletes — vitamin D receptors are present in muscle tissue\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho this is not for\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAnyone who has not checked their level and already takes vitamin D in a multivitamin.\u003c\/strong\u003e Add up your total first.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnyone with high blood calcium, sarcoidosis or certain kidney conditions\u003c\/strong\u003e — speak to your doctor, as vitamin D increases calcium absorption.\u003c\/p\u003e\n\u003cp\u003eIf you spend substantial time outdoors in summer with bare skin, you may need less during those months.\u003c\/p\u003e\n\u003cp\u003eIf you take digoxin or thiazide diuretics, check with your doctor — both interact with calcium levels.\u003c\/p\u003e\n\u003cp\u003eNot for anyone under 18, pregnant or nursing without medical advice.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStack it with:\u003c\/strong\u003e vitamin K2, \u003ca href=\"\/products\/nutra-bio-reacted-magnesium\"\u003emagnesium\u003c\/a\u003e — which is required for vitamin D metabolism — and \u003ca href=\"\/products\/nutra-bio-zinc-chelate\"\u003ezinc\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eShould I take vitamin D with food?\u003c\/strong\u003e\u003cbr\u003eYes, with a meal containing fat. It is fat-soluble, and taking it on an empty stomach substantially reduces absorption.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs 5,000 IU too much?\u003c\/strong\u003e\u003cbr\u003eIt is a correction dose rather than a maintenance one — the upper intake level from all sources is generally cited at 4,000 IU. It is very commonly used, but worth confirming you are low and counting other sources.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if I am deficient?\u003c\/strong\u003e\u003cbr\u003eA 25-hydroxyvitamin D blood test. Sufficiency is generally cited above 30 ng\/mL, with many practitioners targeting 40–60.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy can't I just get it from the sun?\u003c\/strong\u003e\u003cbr\u003eAbove roughly 37°N, which includes Pennsylvania, the sun is too low from around October to March for meaningful UVB to reach the ground.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between D2 and D3?\u003c\/strong\u003e\u003cbr\u003eD3 is the form your skin makes and is more effective at raising and maintaining blood levels. D2 comes from plant and fungal sources.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I take K2 with it?\u003c\/strong\u003e\u003cbr\u003eIt is worth considering, particularly at 5,000 IU. Vitamin D increases calcium absorption; K2 helps direct that calcium into bone.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I take too much?\u003c\/strong\u003e\u003cbr\u003eYes. Vitamin D is stored rather than excreted, so toxicity comes from sustained high intake. Retest after about three months.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it raise testosterone?\u003c\/strong\u003e\u003cbr\u003eCorrecting a deficiency can help, since low vitamin D status is associated with lower testosterone. Supplementing beyond sufficiency will not.\u003c\/p\u003e","brand":"NutraBio","offers":[{"title":"90cap 5000iu","offer_id":1567726731293,"sku":"4990851446","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1009\/8986\/files\/UnboundSupplementsTESTElevateYourGymGameUnleashyourfullpotentialwithUnboundTEST_theelitenaturaltestosteroneboosterdesignedforseriousathletes.Whetheryou_reaseasonedlifter_2.png?v=1722964593","url":"https:\/\/www.coalitionnutrition.com\/products\/nutra-bio-vitamin-d-5000-iu-90-caps","provider":"Coalition Nutrition","version":"1.0","type":"link"}