The vitamin pair that directs calcium to bone and away from arteries. 80% of Spanish adults in winter are below the optimal 25-OH-D range. The DO-HEALTH trial (Nature Aging 2025) demonstrated epigenetic slowing with supplementation.
9Vitamin D3 + K2 appears in 9 protocols personalizable→D3 (cholecalciferol) is a steroid pro-hormone regulating +2,000 genes · K2 (MK-7) directs calcium to bone. Together, preventing arterial calcification without sacrificing bone density.
Vitamin D3 (cholecalciferol) isn't a vitamin in the strict sense · it's a steroid pro-hormone the body synthesizes in skin exposed to UVB. Its receptors (VDR) are in nearly all tissues: regulates expression of over 2,000 genes, modulates immune system, bone mineralization, muscle function and insulin sensitivity.
Vitamin K2 (menaquinone, especially MK-7) activates two key proteins: osteocalcin (carries calcium to bone) and matrix Gla protein / MGP (prevents calcium deposit in arteries). Without sufficient K2, high-dose D3 may paradoxically accelerate coronary arterial calcification.
The D3 + K2 pairing is practically mandatory when you supplement D3 above 2,000 IU/day. It's the canonical formula of the AVADEC study (Knapen et al · Thromb Haemost 2015) that reduced progression of coronary arterial calcification 22% vs placebo.
5 pivotal studies with DOI · meta-analyses + RCTs + cardinal trials from the latest cycle. Mapped to Hallmarks López-Otín 2023.
| Study | Finding | Hallmarks |
|---|---|---|
DO-HEALTH · D3 + omega-3 + exercise · epigenetic slowing Bischoff-Ferrari et al · Nature Aging 2025 | 3-year RCT · n=2,157 adults >70 · D3 (2,000 IU) + omega-3 + exercise combo slowed epigenetic clocks (PhenoAge −2.9 m, GrimAge2 −3.3 m, DunedinPACE −3.8 m) vs placebo. Additive not synergistic effects. | Epigen.Inflamm. |
AVADEC · K2 MK-7 and coronary arterial calcification Knapen et al · Thromb Haemost 2015 | 3-year RCT · n=244 postmenopausal women · 180 µg MK-7/day reduced arterial stiffness progression vs placebo. D3+K2 subgroup: −22% CAC score (Agatston) progression. | Calcif.CV |
VITAL · D3 and cancer mortality Manson et al · NEJM 2019 | 5.3-year RCT · n=25,871 · 2,000 IU D3/d no effect on total cancer incidence · but 25% reduction cancer mortality in 7-year extended follow-up · effect only in low BMI quintiles. | CancerImmune |
Meta D3 + falls and fractures in older adults Manson et al · Ann Intern Med 2022 | Meta 81 RCTs · n=53,537 adults >60 · 800-2,000 IU/day reduces non-vertebral fractures 16% and falls 13%. Greatest effect in baseline deficient (<20 ng/mL). | BoneMuscle |
D deficiency in Spanish adults Mateo-Pascual et al · Nutrients 2014 | Spanish cohort n=2,519 adults · 87% below 30 ng/mL in winter · 50% below 20 ng/mL frank deficiency. High latitude + excessive sun protection + poor fatty fish diet. | SpainPrevalence |
My Protocol generates 3 personalized plans with exact form, dose and combos based on your profile. No commitment.
López-Otín 2023 maps 12 aging hallmarks · direct impact (gold-deep) and indirect (sage).
Protocol based on initial 25-OH-D · 8-12 week ramp-up to target 40-60 ng/mL · K2 mandatory at sustained >2,000 IU.
Before supplementing, know current 25-OH-D (~25 € private analytic). The protocol changes drastically if starting from 12 ng/mL vs 35 ng/mL. Without prior measurement you're blind.
Only if baseline 25-OH-D <20 ng/mL. Take with fatty meal (boosts absorption 30%). Re-measure at 8 weeks.
Once in 40–60 ng/mL range, lower to maintenance. Spain's latitude requires sustained >1,000 IU almost always because endogenous skin synthesis doesn't cover winter.
The 40-60 ng/mL target isn't fixed for everyone · adjust by levels. If you rise to 70+ ng/mL lower dose. If you drop to <30 ng/mL raise.
D3 (cholecalciferol) raises 25-OH-D 87% more than D2 (ergocalciferol). MK-7 has 72h half-life vs MK-4 1-2h. Only two combinations work in humans at useful doses.
3 tiers · D3+K2 combo in a single capsule is most convenient · avoid K2 MK-4 versions (short half-life) and D2 (lower efficacy).
Dose: 2,000 IU D3 + 90 µg K2 MK-7
Form: D3 cholecalciferol + K2 MK-7 (MenaQ7®)
Cert.: GMP · cGMP · NSF · third-party tested
Fillers: Zero · extra virgin olive oil for absorption
Dose: 1,000 IU D3 + 100 µg K2 MK-7
Form: D3 cholecalciferol + fermented K2 MK-7
Cert.: ISO 9001 · batch analysis
Fillers: Sunflower oil · SiO₂ (minimal)
Dose: 5,000 IU D3 + 100 µg K2 MK-7
Form: D3 cholecalciferol + K2 MK-7
Cert.: GMP · Informed Sport
Fillers: Safflower oil · Mg stearate
My Protocol recommends form + brand + exact dose based on your age, budget and biomarkers. No commitment · 3 minutes.
1 mandatory biomarker (25-OH-D) + 2 secondary to ensure correct dose without accumulation.
25-OH-D (calcidiol). Main marker · target 40–60 ng/mL (100–150 nmol/L). It's the long half-life circulating form · reflects body stock. ~22 € in Spanish private analytics (Synlab · Cerba · Echevarne). DON'T request 1,25-OH-D (active form short half-life · not useful for evaluating supplementation).
PTH (parathyroid hormone). Secondary marker · when 25-OH-D rises, PTH falls (inverse relation). Verifies supplementation is working metabolically · not just raising serum. ~12 € additional.
Corrected calcium + albumin. Verify no hypercalcemia with sustained high doses. Especially important if you combine D3 with Ca or have history of kidney stones.
We verify clinics in-situ · analytics with clinical interpretation · no markups. Full panel (D + PTH + Ca + RBC Mg) recommended in a single extraction.
Cases where supplementation requires medical supervision · high-dose D3 has real toxicity risk.
4 combos with cardinal RCT · D3 without its active cofactors doesn't reach real potential.
Mg is cofactor of hepatic (CYP2R1) and renal (CYP27B1) hydroxylation of D3. Without sufficient Mg, supplementing D3 does NOT raise 25-OH-D adequately · most studied combo in longevity.
DO-HEALTH 2025 demonstrated additive D3 + omega-3 effect on epigenetic slowing (PhenoAge −2.9 m over 3 years). Both modulate inflammaging through complementary pathways.
VDR (D receptor) and RXR (A receptor) heterodimerize to activate transcription · A:D 1:1 to 2:1 ratio avoids over-activation of single receptor. Especially relevant for immune system.
Boron reduces urinary excretion of Mg + D3 + Ca · forgotten trace element · 3 mg/day with D3+K2 improves mineral retention in postmenopausal women (Naghii 2011).
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