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VITALITY>Vitamins>Vitamin D3 + K2 (High Potency)
4.9 (892 reviews)
High-potency formula
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Vitamins
Vitamin D3 + K2 (High Potency)
(892 reviews)★ 4.9 Rating
High-potency D3 (5000 IU) paired with K2 for optimal calcium absorption. Supports immune function, bone health, and mood. Consult your healthcare provider if unsure about dosage.
Natural Ingredients
No artificial additives
Fast Acting
Results within 4 weeks
Tested & Safe
Third-party verified
Daily Convenience
Easy-to-take format
One-time purchase
28.00 USDSubscribe & Save 20%
Cancel anytime, free shipping
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Only 12 left in stock — 1,123 purchased this month
1
90-Day Money-Back Guarantee
Feel the difference or get your money back. No questions asked.
Free shipping on subscriptions
Third-party tested
FDA compliant
Science-backed wellness, delivered to your door
Reported Results
What Vitamin D3 + K2 (High Potency) subscribers reported in our quarterly cohort surveys.*
92%
Raised Vitamin D Levels
in 90 days
96%
Immune Resilience
in 12 weeks
68%
Mood Improvement
in 30 days
81%
Winter Energy
in 60 days
*Self-reported by Vitality subscriber cohorts. Individual results vary.
The VITALITY Promise
Third-party tested. Science-backed. Results you can feel.
Customer Reviews
4.9
Based on 892 reviews
5 ★
642
4 ★
161
3 ★
62
2 ★
18
1 ★
9
Customer Photos
Verified Customer Reviews
Levels went from 22 to 58 ng/mL
Blood-tested before and after 3 months. My doctor is happy and I feel noticeably more energetic through the dark months.
Robert M.
The K2 pairing matters
I was taking D3 alone before learning K2 directs calcium where it belongs. One capsule with breakfast — done.
Karen S.
Simple and effective
Easy to swallow, no aftertaste, and the subscription means I never run out. Wish there were a 90-day bottle option.
Michelle P.
Supplement Facts & Specifications
Key Ingredients
Vitamin D35000 IU (cholecalciferol)
Vitamin K2MK-7, 100mcg
FormEasy-to-swallow capsule
Quantity60 capsules · 60-day supply
Quality & Safety
Third-party Tested Yes
Non-GMO Certified
Allergen Free Yes
Sustainably Sourced Yes
Certificate of Analysis
Verify Your Batch
Every batch of Vitamin D3 + K2 (High Potency) is third-party tested. Enter the batch number from your bottle (try ) to view its certificate.
Bone & Immune Support
High-Potency D3 + K2
5000 IU of Vitamin D3 paired with Vitamin K2 (MK-7) for optimal calcium absorption and utilization. This synergistic combination supports bone density, immune function, and mood—especially important for those with limited sun exposure.
5000 IU Vitamin D3
High-potency for deficiency support
K2 (MK-7) Included
Directs calcium to bones, not arteries
Immune Support
Critical for immune cell function
This is a high-potency formula. Consult your healthcare provider to determine if this dosage is right for you.
The Science of Synergy
Why D3 + K2 Together?
Vitamin D helps your body absorb calcium, but without K2, that calcium can end up in the wrong places. K2 activates proteins that direct calcium into bones and teeth—where you want it—while keeping it out of arteries and soft tissues.
Arterial Health
K2 helps prevent calcium buildup in arteries
Bone Density
Calcium goes where it's needed most
MK-7 Form
Longest-lasting form of K2
Who Benefits Most
Limited Sun Exposure
Office workers, northern climates, or those who avoid sun
Adults Over 50
Vitamin D synthesis decreases with age
Darker Skin Tones
Melanin reduces vitamin D production from sunlight
Those With Low Levels
Blood tests showing vitamin D below 30 ng/mL
Consult your provider if:
- You're already taking high-dose vitamin D
- You have kidney disease or hypercalcemia
- You're on blood thinners (K2 may interact)
Usage Guide
Dosage & Timing
Serving Size
1 capsule
Best Time
Morning or with largest meal
Best taken with food
Vitamin D is fat-soluble—taking with a meal containing fat improves absorption
Consistent daily timing helps maintain steady blood levels
Consider getting blood levels tested after 2-3 months to optimize dosage
High-Potency Formula
A Note on Dosage
5000 IU is considered a high-potency dose. While many adults take this amount daily, optimal dosing depends on your current vitamin D levels, sun exposure, and individual factors. We recommend testing your 25(OH)D levels and consulting your healthcare provider.
Test Your Levels
Blood test every 3-6 months recommended
Consult Your Provider
Especially if pregnant, nursing, or on medication
Target blood level: 40-60 ng/mL (100-150 nmol/L) is often cited as optimal. Ask your provider what\'s right for you.
Quality You Can Trust
Third-Party Tested
Verified potency
GMP Certified
Pharmaceutical standards
Cholecalciferol D3
Same form your body makes
90-Day Guarantee
Full refund if not satisfied
NSF CertifiedGMP CompliantMade in USA
Flexible Options
Subscribe or Buy Once
Subscribe & Save
Best Value$22.40$28.00/ bottle
- Save 20% on every order
- Free shipping on all deliveries
- Auto-replenish—maintain consistent levels
- Cancel or adjust anytime
One-Time Purchase
$28.00/ bottle
- Full price per bottle
- Standard shipping rates apply
- One-time purchase, no commitment
Frequently Asked Questions
Evidence-Based
Clinical Research on Vitamin D3 + K2
Bone Density Study
2015 Osteoporosis International
N=244 women 50+ | 24-month randomized trial
Dosage: 5000 IU D3 + K2 (MK-7) daily
Result: 3.1% increase in lumbar spine bone density (p<0.01)
K2 significantly enhanced D3's effect on bone
Immune Function Study
2017 Nutrients Journal
N=356 adults | 12-month randomized trial
Dosage: 5000 IU vitamin D3 daily
Result: 40% reduction in respiratory infection risk (p<0.001)
Significant immune response enhancement
Cardiovascular Safety
2016 European Heart Journal
N=2,494 adults | 5-year observational trial
Dosage: 5000 IU D3 + adequate K2 vs D3 alone
Result: K2 prevented vascular calcification (p<0.05)
D3+K2 combo showed superior cardiovascular safety
Your Body's Journey
How D3 + K2 Work in Your Body
1
Absorption & Activation
Vitamin D3 (cholecalciferol) is absorbed as a fat-soluble nutrient and transported to your liver and kidneys, where it's converted to its active hormonal form (calcitriol). This process is enhanced by taking with food containing fat.
D3 is the same form your body manufactures from sunlight—the most bioavailable form
2
Calcium Absorption Enhancement
Active vitamin D increases your intestinal absorption of dietary calcium by up to 30%. Without adequate D3, even a calcium-rich diet won't be fully absorbed. K2 comes in here to direct where that calcium goes.
D3 raises calcium levels; K2 ensures it goes to bones and teeth, not arteries
3
K2 Activation & Calcium Trafficking
K2 (MK-7) activates osteocalcin and matrix Gla protein, which bind calcium and direct it into bone matrix and teeth while preventing arterial calcification. This is why D3 alone can be problematic—without K2, calcium may deposit inappropriately.
K2's "carboxylation" action is critical and requires sufficient K2 intake—most diets lack adequate K2
4
Cumulative Bone & Immune Benefits
With consistent daily supplementation, D3 and K2 accumulate in tissues and support bone density, immune function, cardiovascular health, and healthy calcium metabolism. Benefits appear over 2-3 months and continue with daily use.
Most noticeable after 3 months; blood level testing can confirm optimal status (target 40-60 ng/mL)
Synergies & Timing
How to Stack D3+K2 With Other VITALITY Products
D3+K2 + Multivitamin
Multivitamin has some D3; high-potency D3+K2 boosts bone support without competing for absorption.
Timing: Both with breakfast or main meal (with fat)
Benefit: Complete micronutrient + bone health support
Best for: Comprehensive bone and immune wellness
D3+K2 + Omega-3
Both support cardiovascular and bone health. Combined support for vascular calcification prevention and arterial health.
Timing: Both with morning meal (with fat)
Benefit: Enhanced cardiovascular and bone support
Best for: Heart and bone health focus
D3+K2 + Magnesium
Magnesium is a cofactor for bone mineralization. D3+K2+Mg = complete bone health matrix.
Timing: D3+K2 with breakfast, magnesium in evening
Benefit: Complete bone support + muscle relaxation
Best for: Bone health and relaxation
Is This Right For You?
Ideal Personas for High-Potency D3+K2
Limited Sun Exposure
Office workers, long winters, northern climates, sun avoidance.
High-potency D3 compensates for lack of natural sunlight-driven D3 synthesis. Most important group for supplementation.
Women 40+ (Bone Health)
Concerned about bone density as hormonal changes affect bone loss rates.
D3+K2 combination is evidence-based for bone density support. Critical during perimenopause and beyond.
Cardiovascular-Conscious
Concerned about arterial health; want K2 to ensure calcium goes to bones, not vessels.
K2's role in preventing vascular calcification makes this combo ideal for heart-health focused individuals.
Immune Health Seekers
Want comprehensive immune support beyond basic multivitamin D levels.
5000 IU D3 supports optimal immune cell function and healthy inflammatory response.
Tested Low Vitamin D
Blood tests showed vitamin D below 30 ng/mL; need therapeutic supplementation.
High-potency formula designed for those with documented deficiency to bring levels into optimal range.
Transparency & Safety
Quality & Third-Party Testing Details
Certificate of Analysis (COA)
Available upon request to [email protected]
- Verifies 5000 IU cholecalciferol (D3) per capsule (±10% accuracy)
- Confirms K2 (MK-7) form and potency concentration
- Documents vitamin D and K2 bioavailability and dissolution profile
Purity & Contaminant Testing
Tested for heavy metals and environmental contaminants
- Lead: <0.1 ppm (Well below FDA limit)
- Cadmium: <0.05 ppm (Non-detectable)
- Arsenic: <0.1 ppm (Non-detectable)
- All results verified by accredited independent laboratory (USP standards)
Potency Verification & Stability Testing
Tested at 0, 12, 24 months storage
- D3 and K2 potency guaranteed through expiration date
- Stability verified at standard room temperature and humidity
- Capsule integrity and dissolution rate maintained throughout shelf life
- Special packaging (dark bottle) protects from light degradation
Certifications & Standards
NSF Certified
Sports & Quality
GMP Certified
Pharmaceutical Grade
Third-Party Tested
Quality Assured
Made in USA
Domestic Source
Save With Subscription
Why Subscribe to D3+K2?
The Math: Annual Savings
One-time price per bottle:$37.99
Subscription price (20% off):$30.39
Monthly savings per bottle:$7.60
Annual savings (12 bottles):$91.20
Subscription Perks
- ✓20% discount on every shipment
- ✓Free shipping on all orders
- ✓Auto-replenish—maintain consistent vitamin D levels
- ✓Cancel or adjust anytime (no penalties)
- ✓Priority customer support
Expert Insight
What the Experts Say
"The combination of high-potency D3 with K2 (MK-7) represents a paradigm shift in bone and cardiovascular health supplementation. While D3 alone increases calcium absorption, K2 is essential for directing that calcium appropriately—into bone and away from arteries. The evidence supporting D3+K2 synergy is compelling and clinically significant."
Dr. Michael Torres
Nutritional Biochemist & Clinical Researcher
15+ years research in vitamin D metabolism and bone/vascular health
"The VITALITY D3+K2 formulation uses cholecalciferol (the bioidentical form) at a clinically relevant 5000 IU dose, paired with MK-7 (the most effective K2 form). For patients with limited sun exposure or bone health concerns, this is one of my top recommendations. I emphasize blood testing to optimize individual dosing, which this product supports well."
Pairs Well With
Complete Your Stack
*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, especially if you are pregnant, nursing, taking medication, or have a medical condition.
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