LifeExtension
LifeExtension Vitamin D3 with K2 and Iodine
78/100
SUPPIE SCORE
88/100
EFFICACY
Medium
SAFETY
88/100
CLEANLINESS
What Does LifeExtension Vitamin D3 with K2 and Iodine Do?
Excellent high-potency formula supports bone, arterial, immune, and thyroid health with optimal D3/K2 synergy. Medium safety due to elevated iodine and vitamin D doses requiring monitoring.
What are the benefits of combining vitamins D3 and K2 for bone health?
Is 1,000 mcg of iodine safe for daily use?
How does MK-7 vitamin K2 differ from K1 in arterial health support?
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What Are the Benefits of LifeExtension Vitamin D3 with K2 and Iodine?
Based on proven scientific research
Bone HealthVery strong
Arterial HealthStrong
Immune FunctionStrong
Thyroid SupportModerate
Cognitive HealthModerate
Good For:
What Are the Side Effects of LifeExtension LifeExtension Vitamin D3 with K2 and Iodine?
Always consult your health practitioner if in doubt.
RiskMedium Risk
Overview
•High vitamin D3 (125 mcg/5000 IU) dosage exceeds RDA but within safe UL (100 mcg); monitor serum levels to avoid hypercalcemia.
•Total 2100 mcg vitamin K safe for most; high doses may interact with warfarin—consult physician if on anticoagulants.
•Iodine at 1000 mcg exceeds RDA (150 mcg) but below UL (1100 mcg); risk of thyroid dysfunction in susceptible individuals.
•Sea-Iodine Complex from organic kelp/bladderwrack may contain trace heavy metals; third-party testing recommended.
•Gluten-free, non-GMO; suitable for most adults but not recommended during pregnancy without medical advice.
•Long-term high-dose use requires periodic thyroid and calcium monitoring.
Potential Side Effects
Negative Interactions
Allergens
Seaweed (kelp, bladderwrack)Iodine (shellfish cross-reactivity)
Inactive Ingredients
Microcrystalline cellulose
Low RiskVegetable cellulose (capsule)
Low RiskMaltodextrin
Low RiskFood starch-modified
Low RiskDicalcium phosphate
Low RiskStearic acid
Low RiskSilica
Low RiskWhat Are the Ingredients in LifeExtension LifeExtension Vitamin D3 with K2 and Iodine?
Vitamin D3 (as cholecalciferol)
125 mcg
Vitamin K1 (as phytonadione)
1000 mcg
Vitamin K2 (as menaquinone-4)
1000 mcg
Vitamin K2 (as trans menaquinone-7)
100 mcg
Iodine (from Sea-Iodine Complex Blend (organic kelp and bladderwrack extracts, potassium iodide))
1,000 mcg
microcrystalline cellulose
vegetable cellulose (capsule)
maltodextrin
food starch-modified
dicalcium phosphate
stearic acid
silica
Dosage & Bioavailability
How the active doses and forms in LifeExtension Vitamin D3 with K2 and Iodine compare to the research.
•Vitamin D3 (as cholecalciferol) is listed at 125 mcg per serving; without a source-specific reference range, dose adequacy cannot be graded.
•Vitamin K1 (as phytonadione) is listed at 1000 mcg per serving; without a source-specific reference range, dose adequacy cannot be graded.
Frequently Asked Questions
Common questions about LifeExtension LifeExtension Vitamin D3 with K2 and Iodine