Why D3X · Liquid Vitamin D3 + K2 with Olive Oil, Made in the USA

Premium liquid
Vitamin D,
done right.

Three ingredients in glass. Made by a company that only focuses on Vitamin D. Designed around the one thing most supplements get wrong: helping you actually take it every day.*

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Made in USA
Third-Party Tested
cGMP Facility
3 Ingredients
No Sweeteners
Olive Oil Base
Glass Bottle
Made in USA
Third-Party Tested
cGMP Facility
3 Ingredients
No Sweeteners
Olive Oil Base
Glass Bottle

Not all
Vitamin D
is the same

Most Vitamin D supplements look similar on the surface. The differences are what's in the bottle, what the bottle is made of, and what happens after you buy it.

 
Typical D brand
D3X
Format
Pills, gummies, or powders with fillers, sugars, or dyes
Liquid drops · 3 ingredients
Carrier
Soybean, sunflower, or canola oil
Organic olive oil
Bottle
Plastic
Glass
K2 form
MK-4 (shorter half-life) or no K2 at all
MK-7 · long-acting
Focus
One of dozens of products on a shelf
Vitamin D is the entire company
After
You buy a bottle and you're on your own
Bottle plus fold-out daily-ritual guide

Vitamin D supplementation only works if you actually take it. Every day, for long enough to matter.* D3X is built around that one fact.

Only three
simple
ingredients

No fillers. No sweeteners. No proprietary blends. Just the three things that actually matter.

01

Vitamin D3
D3X bottle on a travertine slab with a golden droplet falling from the dropper

The star of D3X. D3 behaves more like a hormone than a typical vitamin and influences a wide range of processes in the body.2* We use D3 because it's the form your body naturally makes from sunlight, and it's generally more effective than D2 at raising and maintaining Vitamin D levels.3*

2000 IU per serving
02

Vitamin K2 (MK-7)
Olive branch shadow on warm cream plaster

Helps D3 do its job cleanly. D3 helps your body absorb and use calcium, and K2 helps guide where that calcium gets utilized, supporting proper distribution and balance.5* We chose MK-7 because it stays active longer than other forms,4 a better fit for consistent daily use.

100 mcg per serving
03

Organic olive oil
Bowl of golden-green olive oil on cream plaster with olive branch and ripe olives

Vitamin D is fat-soluble, so it absorbs best with fat.2* We use olive oil as a clean, food-based carrier, naturally rich in antioxidants and a better choice than the seed oils and synthetic carriers most supplements rely on.

Cold-pressed · organic

No sugar, sweeteners, artificial flavors or colors, fillers, dyes, or unnecessary additives. What's on the label is what's in the bottle.

Bottle and a
blueprint

Two things ship in every box. The product, and the fold-out guide that helps you stay consistent. Because consistency is the whole point.*

D3X liquid Vitamin D3 + K2 glass bottle with dropper
The bottle
30 servings · glass · 1 fl oz
2000 IU Vitamin D3, 100 mcg K2 (MK-7), organic olive oil. One full dropper a day.
D3X fold-out daily-ritual guide
The blueprint
Fold-out guide · daily ritual
A fold-out guide tucked into every box. It covers how to take D3X, why consistency matters, and how to make the habit stick. Almost no supplement brand bothers including one. We do, because a bottle in the cupboard does nothing.*

A habit
that sticks

01
1 mL, once a day
Drop it into your coffee, shake, food, or straight under your tongue. Takes three seconds and works all the same.
02
Same time, every day
Pick a moment in your routine and pair it there. Morning coffee, pre-workout, breakfast. Whatever you're already doing works.
03
Keep it going
Consistency is where D3X actually works.* If you haven't subscribed yet, the 3-month plan is the move. It shows up automatically so you never have to think about it.

No hype.
Just research.

More than 70% of Americans don't have enough Vitamin D.1 Why it matters, who's most affected, and what modern life has to do with it. Long-form reading from the D3X library.

01
Research
Why Consistency Is the Hard Part of Vitamin D
→
02
Research
What's Actually in Your Vitamin D Supplement
→
03
Research
Can You Get Enough Vitamin D From the Sun?
→
The Science →

Sources

Every health claim on this page is backed by peer-reviewed research. Tap any reference to read the original study.

Show all sources
  1. 1
    Vitamin D deficiency and insufficiency among US adults: prevalence, predictors and clinical implications
    British Journal of Nutrition · 2018
    View study →
  2. 2
    Vitamin D Deficiency
    Holick MF · New England Journal of Medicine · 2007
    View study →
  3. 3
    Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis
    Tripkovic et al. · American Journal of Clinical Nutrition · 2012
    View study →
  4. 4
    MK-7 and Its Effects on Bone Quality and Strength
    Sato et al. · Nutrients · 2020
    View study →
  5. 5
    Dietary intake of menaquinone is associated with a reduced risk of coronary heart disease: the Rotterdam Study
    Geleijnse et al. · Journal of Nutrition · 2004
    View study →

Time to get
serious about
your D.

Three ingredients. One daily habit. A bottle and a blueprint, shipped free.

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