ESSENTIAL · IMMUNE & BONE
Vitamin D3 + K2
HIGH-POTENCY VITAMIN D3 WITH K2 (MK7) · 100 SERVINGS · ONCE-DAILY CAPSULE
Form
Capsule
Servings
100
D3 Dose
5000 IU
K2 Form
MK7
$27.99
$0.28 per serving · 100-day supply
Vitamin D3 paired with the bioactive MK7 form of vitamin K2 — the two fat-soluble vitamins that work together to support healthy calcium metabolism, bone integrity, and immune function. 5000 IU of D3 (cholecalciferol) and 180mcg of K2 (Stabilized vitaMK7® by Gnosis) per once-daily capsule.
⚠ Contains:
No added sugar, starch, preservatives, artificial colors, flavors, additives, wheat, yeast, soy, or dairy.
Great for
- Adults with limited sun exposure or who live above 35° latitude
- Office workers, indoor athletes, and night-shift workers
- Older adults supporting healthy bone density
- Anyone taking calcium and wanting to direct it to the right places
- Use alongside resistance training and adequate dietary protein
Not ideal for
- Pregnant or breastfeeding individuals without medical guidance
- Those under 18 years of age
- People taking blood-thinning medications (consult your doctor about K2)
- Anyone with hypercalcemia or kidney conditions
FDA-Registered Facility
Made Under cGMP
Identity Verified
Free Shipping
Manufactured in the USA. Vitamin K2 sourced as vitaMK7® from Gnosis S.p.A.
Non-GMO
Gluten Free
Vegetarian
Made Under cGMP
FDA-Registered Facility
EVERYTHING YOU NEED TO KNOW
Full transparency. Full ingredient disclosure.
Two vitamins. One purpose. D3 directs calcium absorption; K2 directs that calcium to bone. Taken alone, D3 can leave the system imbalanced — together they're synergistic.
| Ingredient | Dose | Purpose |
|---|---|---|
|
Vitamin D3
As Cholecalciferol
|
5000IU | Vitamin D3 supports normal calcium absorption, immune function, and muscle function. The cholecalciferol form is identical to what your skin produces from sunlight exposure. |
|
Vitamin K2
As Menaquinone-7 (MK7) — Stabilized vitaMK7® by Gnosis
|
180mcg | K2 (MK7) supports the activation of proteins that direct calcium to bone tissue. MK7 is the long-chain bioactive form of vitamin K2, with a longer half-life and steadier blood levels than the shorter MK4 form. |
|
Vegetarian Capsule
Hypromellose, Purified Water
|
— | Plant-based capsule shell. No animal-derived gelatin. |
|
Rice Flour
Inactive ingredient
|
— | Used as a natural filler to ensure consistent capsule fill weight. |
Vitamin D3
As Cholecalciferol
5000IU
Vitamin D3 supports normal calcium absorption, immune function, and muscle function. The cholecalciferol form is identical to what your skin produces from sunlight exposure.
Vitamin K2
As Menaquinone-7 (MK7) — Stabilized vitaMK7® by Gnosis
180mcg
K2 (MK7) supports the activation of proteins that direct calcium to bone tissue. MK7 is the long-chain bioactive form of vitamin K2, with a longer half-life and steadier blood levels than the shorter MK4 form.
Vegetarian Capsule
Hypromellose, Purified Water
—
Plant-based capsule shell. No animal-derived gelatin.
Rice Flour
Inactive ingredient
—
Used as a natural filler to ensure consistent capsule fill weight.
How this product is made and what we verify before it ships.
FDA-Registered Manufacturing
Produced in a US manufacturing facility registered with the FDA for dietary supplement production. The registration is independently maintained and subject to federal inspection.
Made Under cGMP Standards
Production adheres to current Good Manufacturing Practices, the federal framework that governs identity, purity, strength, and composition of every batch. All processing happens in dedicated clean rooms designed to prevent cross-contamination.
Branded K2 Source
The MK7 used here is Stabilized vitaMK7® from Gnosis — a documented, naturally-fermented form of vitamin K2 with stability and purity specifications backing every batch, not a generic K2 blend.
Raw Materials Tested for Identity & Heavy Metals
Each incoming raw material batch is verified against identity and purity protocols before production begins. Heavy metals screening is part of the standard intake process.
Microbial Safety Checks
Both the production environment and the finished product are tested for microbial hazards. Contamination controls are monitored throughout holding, processing, and packaging.
D3 + K2 Together, As Designed
D3 and K2 are paired in a single capsule for synergy and convenience. Buying separate D3 and K2 supplements often leads to inconsistent dosing — here they're balanced and combined.
We don't cite studies to impress — we cite them so you can verify. Each finding maps to peer-reviewed, publicly available research.
D3 + K2 Synergy
Vitamins D and K work synergistically in calcium metabolism and skeletal health, with combined supplementation producing more favorable bone outcomes than either alone.
van Ballegooijen et al., 2017. The synergistic interplay between vitamins D and K for bone and cardiovascular health: a narrative review. International Journal of Endocrinology, 2017:7454376.
View on PubMed → (opens in new tab)
Vitamin D Status
Vitamin D inadequacy is highly prevalent in the United States, with significant populations falling below thresholds associated with optimal bone, immune, and muscle function.
Holick, 2007. Vitamin D deficiency. New England Journal of Medicine, 357(3):266-281.
View on PubMed → (opens in new tab)
MK7 Bioavailability
Long-chain menaquinones (MK7) demonstrate longer half-lives and more sustained serum activity than vitamin K1 or shorter menaquinones, supporting steadier daily activation of K-dependent proteins.
Schurgers et al., 2007. Vitamin K-containing dietary supplements: comparison of synthetic vitamin K1 and natto-derived menaquinone-7. Blood, 109(8):3279-3283.
View on PubMed → (opens in new tab)
Bone & Muscle
Adequate vitamin D status is associated with maintained muscle function and reduced risk of falls and fractures in older adults.
Bischoff-Ferrari et al., 2009. Fall prevention with supplemental and active forms of vitamin D: a meta-analysis of randomised controlled trials. BMJ, 339:b3692.
View on PubMed → (opens in new tab)
Take 1 capsule daily with food, ideally a meal containing some fat (D3 and K2 are both fat-soluble — absorption is significantly improved when taken with dietary fat). Best taken consistently rather than occasionally; benefits build with stable blood levels over weeks.
Serving Size
1 capsule
Servings Per Container
100
Best With
A meal containing dietary fat
Storage
Cool, dry place. Keep tightly sealed.
Form
Vegetarian capsule
Honest expectations. Here's what consistent daily use typically looks like.
Weeks 1–4
Building Up
Daily intake gradually raises serum 25(OH)D levels — the marker your doctor measures. Most people start to see meaningful changes in blood levels within 4 weeks of consistent dosing.
Months 2–3
Steady State
Serum D3 plateaus at a stable level matched to your daily intake. K2 (MK7) reaches stable activity around the same window. This is when the synergistic effects on calcium metabolism are most evident.
Long-Term
Maintenance
D3 + K2 work as a daily maintenance pair. Skipping doses causes levels to drop predictably — consistent intake matters more than perfect timing.
Every MAXIS product is designed to work alongside the others. Here's how Vitamin D3 + K2 pairs with what we carry.
Pairs with
Magnesium
Magnesium is required to activate vitamin D in the body — paired intake supports both.
Pairs with
Omega-3 Fish Oil (EPA + DHA)
D3 and omega-3 both support normal cardiovascular and immune function.
Pairs with
Grass-Fed Whey Protein (Vanilla)
D3 supports muscle and bone function; protein provides the substrate for tissue maintenance.
D3 helps your body absorb calcium. K2 helps direct that calcium to bone tissue rather than soft tissue or arteries. Taking D3 alone — especially at higher doses — can leave your system without the K2 it needs to manage the calcium D3 mobilizes. Pairing them is a more complete approach to bone and cardiovascular support.
5000 IU is a common adult dose, well above the RDA (600–800 IU) and well within the dose ranges studied for individuals working to correct low D3 status. The official Tolerable Upper Limit is 4000 IU/day, though many physicians and recent reviews support higher daily doses for adults with documented insufficiency. If you're unsure of your status, a 25(OH)D blood test from your doctor can guide whether this dose is right for you.
MK7 is the long-chain bioactive form of vitamin K2 with a longer half-life — once-daily dosing produces stable blood activity. MK4 has a much shorter half-life and typically requires multiple daily doses to maintain activity. We use Stabilized vitaMK7® from Gnosis for confirmed potency.
Whichever you'll remember consistently. Take it with a meal containing some fat — both D3 and K2 are fat-soluble vitamins, and absorption can drop substantially without dietary fat present.
Yes — that's part of the rationale for D3+K2. They direct calcium where you want it (bone) rather than where you don't (arteries, soft tissue). If you take a calcium supplement, taking D3+K2 with it is a sensible pairing.
If you take warfarin (Coumadin) or another vitamin-K-sensitive anticoagulant, do not start K2 without talking to your prescribing physician. K2 can affect how these medications work, and dose adjustments may be needed. Most modern blood thinners (like apixaban or rivaroxaban) are not affected by vitamin K, but always check with your doctor.
Some people can — adults living in lower latitudes, spending significant unprotected time outdoors year-round. For most US adults, especially those living north of about the 35th parallel or working primarily indoors, dietary and skin-synthesized D3 falls short of optimal levels. Vitamin K2 in MK7 form is also rare in standard Western diets — fermented foods like natto are the main source.
COMPLETE YOUR STACK
Products that pair with Vitamin D3 + K2.
Magnesium
Magnesium is required to activate vitamin D in the body — paired intake suppo...
$29.99
Omega-3 Fish Oil (EPA + DHA)
D3 and omega-3 both support normal cardiovascular and immune function.
$29.99
Grass-Fed Whey Protein (Vanilla)
D3 supports muscle and bone function; protein provides the substrate for tiss...
$39.99
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen. Individual results may vary.
Vitamin D3 + K2
$27.99