One nutrient. One company.
D3X is a single-product supplement brand, started in 2024 in New Jersey. We make one thing: liquid vitamin D3 + K2 in organic olive oil, in a glass bottle, made in the USA and third-party tested.
One product, because 70% of Americans are low on vitamin D1 and most don't know it.
“I found out I was low from a blood test. I had no idea. Then I found out a huge part of the country was in the same spot.”
Tim Goldschmidt, Founder
Why I started D3X
I came from pharma, on the finance side. You learn quickly where the industry's money goes, and where it doesn't.
Roughly 3% of US healthcare spending goes toward prevention.2 Most of the system operates downstream, after people are already sick.
My own blood test made it personal. Low vitamin D, no symptoms I would have connected to it, and no doctor had ever mentioned it. Once I started reading, the number got bigger than me: about 70% of Americans are low too.1
Vitamin D behaves more like a hormone than a vitamin.3 It's also not usually included in a standard blood panel, so most people never find out.
Then I went looking for something to take.
Plastic bottles. Seed oil bases. Fillers and proprietary blends. Everything on that shelf was built like vitamin D was a side project.
That's when it clicked.
The supplement aisle is crowded with products that are great at branding and thin on research. Vitamin D is the opposite: one of the most studied nutrients there is, and low vitamin D is one of the most common nutritional gaps in the country.
But it doesn't have an obvious owner.
You can't patent vitamin D itself, so pharmaceutical companies don't have the same incentive to build an entire category around it. And most supplement brands treat it as one product out of hundreds.
It was big enough to deserve a company of its own.
So we built one.
One product, made properly, with a company focused entirely on vitamin D. If we can help even a fraction of those people pay attention to their vitamin D and make it part of their daily routine, that's meaningful.
That's the mission.
Tim GoldschmidtFounder and CEO, D3XFive reasons the gap exists
Most people are low for more than one of these at once.
One bottle. Three ingredients.
Liquid, because a dropper is easy to build into a daily routine. Olive oil, because vitamin D is fat-soluble and we wanted a simple oil base. Glass, because we didn't see a reason to put it in plastic. D3 with K2 as MK-7, made in the USA and tested batch by batch.
That's the whole product. No second SKU, no line extension, no greens powder. If we get this one thing right, that's the company.
Vitamin D isn't a cure for anything, and we'll never tell you it is. But it's a basic nutrient, and too many people are low without knowing it.
Questions about us
Product questions live on the FAQ page.
Who makes D3X?
D3X LLC, based in New Jersey. D3X was started in 2024 by Tim Goldschmidt, who came from the finance side of pharma, with co-founder Golan Cohen.
Where is D3X made?
In the United States, in a cGMP facility, bottled in amber glass with a 1 mL dropper. Every batch is third-party tested for potency and heavy metals before it ships.
Is D3X third-party tested?
Yes. Every batch is third-party tested for D3 and K2 potency and screened for heavy metals before it ships. Email team@d3x.health with "Lab report" in the subject and we'll send you the certificate of analysis for the current batch. You shouldn't have to take our word for what's in the bottle.
Why only one product?
Because roughly 70% of American adults are low on vitamin D and most never find out. One product means every decision, from the carrier oil to the subscription timing, gets made around that one problem.
Time to get serious about your D.
Three ingredients. One dropper a day. Every bottle ships with a fold-out guide.
Shop D3X$22.40/bottle on the 3-month plan · 75¢ a day
Sources4
- 1Vitamin D deficiency and insufficiency among US adults: prevalence, predictors and clinical implicationsLiu et al. · British Journal of Nutrition · 2018View study
- 2What do we know about spending related to public health in the U.S. and comparable countries?Peterson-KFF Health System Tracker · 2020View source
- 3Vitamin D DeficiencyHolick MF · New England Journal of Medicine · 2007View study
- 4Sunlight and Vitamin D: A global perspective for healthWacker & Holick · Dermato-Endocrinology · 2013View study