Many D3+K2 formulas provide only half the K2 dose and a small supply. We tested five popular brands and ranked them by K2 dosage, D3 potency, supply per bottle, and daily cost. One formula ranked first in every category.
Best Vitamin D3 and K2 Supplements - 2026 Quick Picks
Dr. Berg D3+K2 — unique cofactor formula with zinc, B6 & magnesium
🏅 Best Pharmacy Pick
Nature Made D3+K2 — widely available, #1 Pharmacist Recommended brand
Many D3+K2 supplements provide only 100mcg of K2. This is lower than the 180mcg dose used in notable clinical research on bone health.
We tested five popular vitamin D3 and K2 supplements for 2026. Each product was ranked by K2 dosage, D3 potency, supply per bottle, and daily cost.
Here is the full breakdown.
Why Vitamin D3 Becomes More Important as You Age
Low vitamin D may affect energy, mood, bone strength, muscle function, and overall health.
Your vitamin D needs may change with age. Sun exposure, diet, lifestyle, medication, and existing health conditions can also affect your vitamin D level.
20s–30s
ENERGY, MOOD & DAILY ROUTINE
Indoor work, limited sunlight, stress, and poor sleep may contribute to low vitamin D levels. Low vitamin D may be linked to tiredness, reduced energy, and changes in mood.
Consistent vitamin D intake · Healthy daily routine
40s
CHANGING HEALTH NEEDS
Your body may process nutrients differently as you age. Lifestyle changes and reduced sun exposure may also affect vitamin D levels. You may begin to notice changes in energy, mood, sleep, and recovery.
High-potency D3 · K2 for normal calcium use
50s
BONE & HEART HEALTH
Bone density may naturally decline with age. Vitamin D supports calcium absorption. Vitamin K2 helps activate proteins involved in using calcium throughout the body.
D3 for calcium absorption · MK-7 K2 support
60+
BONE DENSITY & MOBILITY
Older adults have a higher risk of low vitamin D, reduced bone density, and mobility problems. Regular testing can help show whether you need a maintenance dose or a higher doctor-supervised dose.
Consistent intake · Regular bloodwork · Professional guidance
The Full Reviews — Ranked #1 to #5
Scored on 6 criteria · verified specs · real customer reviews
Highest K2 dose in the comparison - 200mcg MK-7 vs 100mcg across every other brand tested. That's the difference between reaching the clinical threshold and falling short.
Built to correct deficiency, not maintain it - 10,000 IU is the therapeutic dose when bloodwork is flagged low. The 2,000–5,000 IU used by most competitors won't move your numbers if you're already deficient.
Up to 6× more supply than Thorne per bottle - 180 softgels vs Thorne's 30-serving bottle. One Microlabs purchase replaces 6 Thorne purchases, with no supply gaps and no routine-breaking reorders.
Support for Energy, Mood and General Wellness -Vitamin D plays a role in many important functions throughout the body. Maintaining a healthy vitamin D level may support normal energy, mood, immune function, muscle function, and overall health.
Coconut oil absorption in every softgel - Fat-soluble vitamins require a fat carrier to absorb properly. Microlabs uses coconut oil in every softgel — same absorption profile as physician-grade alternatives at under $0.25/day.
30-day direct refund guarantee - Not a marketplace return. A brand-direct, no-questions refund if you don't notice a difference in 30 days. Sports Research, Dr. Berg, Nature Made, and Thorne do not offer equivalent direct guarantees.
VERIFIED CUSTOMER RESULTS
★★★★★ "My vitamin D levels were critically low at 17 and after 12 weeks I'm now at 70."
— Micheal D., Verified Buyer · themicrolabs.com | D Level: 17 → 70 ng/mL
★★★★★ "My blood tests always result in low Vitamin D until I switched to this brand. Finally holding a normal range."
— Ava M., Verified Buyer · themicrolabs.com | Bloodwork normalised
★★★★★ "Noticed the difference in my sleep and energy within the first month. Doctor confirmed my levels came up significantly."
1,000 IU per drop · Adjustable dosing · NSF Certified for Sport
1,000 IU
D3 PER DROP
Varies
K2 PER USE
~2 months
AT 5,000 IU/DAY
NSF ✓
CERTIFIED FOR SPORT
Liquid
DROPPER FORMAT
NSF Certified for Sport — highest testing cert available · used by healthcare practitioners
10,000 IU = counting 10 drops daily — frustrating and error-prone
No fixed K2 dose — varies every use
Premium price point · no direct guarantee
vs Microlabs: Right pick for doctor-supervised protocols requiring NSF certification. For independent daily use, Microlabs wins on fixed dosing, supply, and cost.
#1 Pharmacist Recommended · widely available in-store
D3+K2 SKU not third-party tested · 100mcg K2 · 30-day supply max
No brand-direct guarantee
vs Microlabs: Strong brand trust. Weak formula for deficiency correction — half the K2, fraction of the supply, no testing on this specific SKU.
OUR EVALUATION FRAMEWORK
What We Looked for in Every Formula
CRITERION
WHY IT MATTERS
WHAT WE REQUIRED
K2 dose (MK-7)
Directs calcium into bones, not arteries. The Knapen 2013 trial used 180mcg. Most brands provide only 100mcg.
180–200mcg MK-7 minimum
D3 potency
Maintenance doses may not improve flagged bloodwork. A diagnosed deficiency may need a therapeutic dose under medical guidance.
5,000 IU minimum; 10,000 IU preferred
Supply per bottle
30 servings = 12 reorders per year. Each gap is a chance to fall off the routine.
90+ servings
Daily cost
Physician-grade brands at $0.50–$1.00/day cost $180–$360 more per year for the same result.
Under $0.35/day at full dose
Oil-based delivery
D3 and K2 are fat-soluble. No oil carrier = poor absorption.
Coconut oil or MCT softgel
Direct guarantee
Marketplace listings route returns through the retailer. A brand-direct guarantee signals confidence.
Brand-direct 30-day refund
Scorecard — All 5 Brands
BRAND →
Microlabs
Sports Research
Thorne D3+K2
Dr. Berg D3+K2
Nature Made
K2 DOSE
10/10
6/10
4/10
6/10
6/10
D3 POTENCY
10/10
6/10
8/10
10/10
6/10
SUPPLY
10/10
6/10
6/10
8/10
3/10
DAILY COST
10/10
6/10
3/10
6/10
6/10
ABSORPTION
10/10
10/10
8/10
8/10
8/10
GUARANTEE
10/10
4/10
4/10
6/10
2/10
TOTAL /60
60
38
33
44
31
Ingredient Comparison
BRAND
Microlabs
Sports Research
Thorne D3+K2
Dr. Berg D3+K2
Nature Made
200MCG K2
✓
✗
Varies
✗
✗
10,000 IU D3
✓
✗
Adjustable
✓
✗
6+ MO SUPPLY
✓
✗
At low dose
✗
✗
<$0.30/DAY
✓
✗
✗
✗
At low dose
OIL-BASED
✓
✓
✓
✓
✓
DIRECT GUARANTEE
✓
✗
✗
Brand only
✗
FREQUENTLY ASKED QUESTIONS
Questions to Ask Before Buying
What's the difference between K2 as MK-7 and MK-4?
MK-7 and MK-4 are two forms of vitamin K2. MK-7 stays in the body longer than MK-4. This allows it to support more stable blood levels with once-daily use.
Why do I need K2 if I'm already taking D3?
D3 increases calcium absorption from the gut into your bloodstream. Without K2, that circulating calcium doesn't have clear direction — it can deposit in soft tissue and arteries instead of bone. K2 activates proteins that direct calcium into the bone matrix and away from arterial walls. Taking D3 without K2 over a long period may increase arterial calcification risk.
How long does it take to notice a difference?
The time can vary from person to person. If your vitamin D level is low, you may notice changes in energy, mood, or general well-being after several weeks. Measurable changes in blood levels may take around 8–12 weeks.
Is 10,000 IU of D3 safe for daily use?
The NIH tolerable upper intake level for vitamin D is 4,000 IU/day for general adults, but this is a conservative guideline. Many healthcare providers prescribe 10,000 IU specifically for patients with confirmed deficiency. At therapeutic doses, regular bloodwork monitoring is advisable. Consult your doctor if you have concerns about your specific situation or are on any medications.
Why do many brands provide only 100mcg of K2?
Brands use different amounts based on their formulas, target customers, manufacturing costs, and serving recommendations. One notable clinical study involving MK-7 used 180mcg per day. Microlabs provides 200mcg per softgel. This does not mean everyone needs 200mcg. Individual needs may vary.
OUR 2026 VERDICT
Microlabs Is Our Best Overall D3+K2 Supplement
No other product in this comparison combines 200mcg of K2, 10,000 IU of vitamin D3, 180 softgels, and a direct 30-day guarantee at under $0.25 per day.
No other product in this comparison combines 200mcg of K2, 10,000 IU of vitamin D3, 180 softgels, and a direct 30-day guarantee at under $0.25 per day.
No other product in this comparison combines 200mcg of K2, 10,000 IU of vitamin D3, 180 softgels, and a direct 30-day guarantee at under $0.25 per day.
This article is sponsored content / an advertorial. Links to products may be affiliate links. This content is for informational purposes only and does not constitute medical advice. Consult a healthcare professional before starting any new supplement. These statements have not been evaluated by the Food and Drug Administration.
