My Supplement Boost · Daily Essentials
Vitamin D3 2,000 IU
The honest version: the real doses, the evidence graded for what it’s worth, and who should skip this one.
Vitamin D3 2,000 IU · 100 softgels
The biggest trial ever run used exactly this dose.
One ingredient, the better of the two forms, above the RDA and half the ceiling. And the landmark trial that tested it on 25,871 people — printed on the page rather than left for you to find.
Everything on the label
What's actually in it.
One softgel, one active ingredient: 2,000 IU of vitamin D3 as cholecalciferol — 50 micrograms. That's it. Everything else in the capsule exists to hold the D3 and keep it stable, which for a fat-soluble vitamin means oil.
Two things about this product are worth knowing before you add it to the basket, and neither is printed prominently on the bottle.
The softgel shell is gelatin — animal-derived. The carrier oils are soybean oil and corn oil. If you avoid animal products, or you avoid soy, this is not your vitamin D. Vegan D3 from lichen exists and we'd rather point you at it than sell you the wrong bottle.
- Gelatin, glycerin, water
- The softgel shell. Gelatin is collagen from animal sources — this is what makes the product non-vegan and non-vegetarian.
- Soybean oil, corn oil
- The carrier. Vitamin D is fat-soluble, so it has to be suspended in a fat to be absorbed properly. Soy is one of the major declared allergens.
Made in the USA in an FDA-registered facility. 100 softgels — a little over three months at one a day.
* Percent Daily Value based on the FDA's 20 mcg (800 IU) Daily Value for vitamin D.
Other Ingredients: Softgel (gelatin, glycerin, water), Soybean Oil, Corn Oil.
The evidence
What the research actually shows.
Vitamin D has the strangest evidence base of anything we stock: rock solid for one thing, and repeatedly disappointing for the long list of things it got famous for. Both halves are below.
Bone and muscle function — settled
Vitamin D's core job isn't in dispute. It's required for calcium absorption in the gut, and without enough of it your body cannot maintain normal bone mineralisation. Severe deficiency causes rickets in children and osteomalacia in adults. Vitamin D also plays a documented role in normal muscle function and immune function. This is textbook physiology, not a claim we're making.
Deficiency is common — in specific groups
The people most likely to be short are the ones you'd expect: adults with little sun exposure, people who cover their skin, those with darker skin (melanin reduces vitamin D synthesis), older adults (skin synthesis declines with age), people with fat-malabsorption conditions, and anyone living at a northern latitude through winter. If none of those describe you, your odds of being deficient are lower than the marketing implies.
The threshold nobody agrees on
Here's the part almost no supplement page tells you. Authorities genuinely disagree about how much blood vitamin D is "enough." The National Academies set sufficiency at 20 ng/mL; the Endocrine Society has used 30 ng/mL. That single difference decides whether millions of people are classified as deficient or perfectly fine. It's an unresolved scientific disagreement, and anyone who tells you the answer is obvious is selling something.
VITAL — the trial that changed the story
The largest randomised trial of vitamin D ever run gave 25,871 adults 2,000 IU a day — this exact dose — for a median 5.3 years. Cancer incidence: hazard ratio 0.96, P = 0.47. Major cardiovascular events: hazard ratio 0.97, P = 0.69. Neither result was statistically significant. A follow-on analysis found no reduction in fractures in generally healthy adults either. We're putting the trial of our own product's dose on our own product page, because you deserve to see it.
Mood, immunity and the winter story
You'll see vitamin D tied to winter mood, immune resilience and a dozen other things. The honest position is that observational studies keep finding associations and randomised trials keep failing to confirm them. Low vitamin D travels with a lot of conditions; that doesn't establish which way the arrow points. We're not going to build a sales pitch on it.
The biggest trial ever run on vitamin D used exactly this dose for five years and missed its endpoints. We put it on the page rather than hoping you'd never look it up.
Our standard
How to take it
One softgel. With food.
With a meal containing fat
Vitamin D is fat-soluble. Taken with a meal that has some fat in it, absorption is meaningfully better than on an empty stomach.
Any time of day
Morning, evening, doesn't matter. Consistency matters more than timing — it's a level you build, not a dose you feel.
Count everything you take
Multivitamins, calcium-plus-D, fortified milk. The 4,000 IU upper limit applies to your total, not to this bottle alone.
The only way to know if you need this is a blood test. It's a cheap, ordinary test your doctor can add to routine bloodwork, and it turns this from a guess into a decision. If you're low, correcting it is worthwhile and this dose will do it. If you're already sufficient, taking more does not make bones stronger or immunity better — it just raises a number that was already fine. We'd rather you spend $20 on the test than $19.90 on a bottle you don't need.
Before you buy
Who should skip this one.
Vitamin D is fat-soluble, which means it accumulates. Unlike vitamin C, your body doesn't flush the excess. Sustained high intake raises blood calcium, and that is the real risk with this vitamin — nausea, weakness, frequent urination, kidney stones and kidney damage at the far end. The tolerable upper limit for adults is 4,000 IU a day from all sources. This bottle is 2,000.
Talk to your doctor before taking this if you:
- Have high blood calcium, hyperparathyroidism, or sarcoidosis — these conditions change how your body handles vitamin D entirely.
- Have kidney disease or a history of kidney stones — the calcium effect matters more for you.
- Take thiazide diuretics, digoxin, or steroid medication — all interact with vitamin D or calcium handling.
- Take a statin, orlistat, or a bile acid sequestrant — these can affect absorption in either direction.
- Are pregnant, nursing, or under 18 — get a dose recommendation rather than guessing.
Not suitable for vegans or vegetarians. Not suitable if you avoid soy. Worth saying twice, because it's the kind of thing people find out after the bottle arrives.
Straight answers
Vitamin D questions, answered.
Is 2,000 IU too much?
No. It's above the 600 IU RDA and at half the 4,000 IU upper limit — a common, well-tolerated supplemental dose, and the one used in the big VITAL trial. Just count anything else you take that contains D.
Then why bother, if VITAL was negative?
Fair question and we'd rather answer it than dodge it. VITAL tested whether extra vitamin D helps generally healthy, mostly sufficient adults avoid cancer and heart disease. It didn't. That is a different question from whether correcting an actual deficiency is worthwhile — it is. This is a supplement for people who are short, not a shield for people who aren't.
Can't I just get it from the sun?
Often, yes — that's the primary source for most people. But synthesis depends on latitude, season, time of day, skin tone, age and how much skin is exposed. Above roughly 37° north, winter sunlight is too weak for meaningful production regardless of how long you stand in it.
D3 or D2?
D3. It's the form your own skin produces and it raises and sustains blood levels more effectively than D2. D2 is typically the plant/fungal-derived form used in vegan products and in some prescriptions.
Is there a vegan version?
Not this one — it's gelatin. Vegan D3 is made from lichen and is widely available. We'd rather tell you that than have you find out from the ingredient panel.
Should I take vitamin K2 with it?
You'll see this recommended constantly. The theory — that K2 directs calcium to bone rather than arteries — is biologically plausible and genuinely interesting. The human outcome evidence is not yet strong enough for us to tell you it's necessary. If you want it, take it; we're not going to pretend it's settled.
Our standard
Why we stock it.
A single-ingredient, correctly-formed vitamin at a sensible dose — for the specific people who are actually short of it.
There's nothing clever about this product and that's the point. One active ingredient, the better of the two forms, a dose above the RDA and well under the ceiling. What we won't do is imply it does more than the evidence supports, or let you buy a gelatin softgel without knowing it's gelatin.
Sources. Vitamin D — Health Professional Fact Sheet, NIH Office of Dietary Supplements. · Manson J.E. et al., Vitamin D Supplements and Prevention of Cancer and Cardiovascular Disease, N Engl J Med 2019;380:33–44. · LeBoff M.S. et al., Supplemental Vitamin D and Incident Fractures in Midlife and Older Adults, N Engl J Med 2022;387:299–309.