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Vitamins D and K with Sea-lodine

Life Extension
4.8
★ ★ ★ ★ ★
(22731 ratings)
Iodine 1000 mcg
Vitamin K 2100 mcg
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Score90

A potent mix of Vitamins D, K, and iodine for comprehensive metabolic and bone health support.

How scoring works
Quantity:60 Capsule(s) • (60 servings)
Goals:
General Health
Anti-Aging
Bone Health
Heart Health
Cardiovascular Support
Energy
Metabolism Boost

Score 90

A potent mix of Vitamins D, K, and iodine for comprehensive metabolic and bone health support.

How scoring works
$16.50($0.27 per serving)
Vitacost
$ 18.00
Pure Formulas
$ 18.00
Amazon
$ 16.50
iHerb
$ 18.00
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Analysis

This formula delivers a strong dose of 5000 IU of Vitamin D3 and 2100mcg of Vitamin K, along with iodine from a sea-complex. These nutrients work together to support bone density and ensure that calcium is properly managed in the body.

The sea-iodine complex also helps support healthy thyroid function, which regulates your metabolic rate. It is a highly bioavailable and affordable way to cover several important nutritional gaps in one capsule.

Pros

  • High-dose Vitamin D3 and K
  • Sea-sourced iodine for thyroid support
  • Excellent price for the potency
  • Only one small capsule per day

Cons

  • Iodine dose is very high for standard maintenance
  • Vitamin K subtypes are not fully disclosed
  • May be too potent for those with high iodine intake

Warnings

  • Consult a professional if you have thyroid concerns
  • High iodine doses should be monitored regularly

Nutrient quality

85 Highest impact

High concentrations of Vitamin D3 and K provide robust systemic support, though the aggressive Iodine dose should be monitored. Bioavailability appears strong for the fat-soluble vitamins and sea-sourced mineral complex.

Ingredient transparency

87 Highest impact

Labeling clearly specifies the source of iodine but lacks detailed transparency for the Vitamin K subtype. Dosage information for active components is provided, though more specificity for K2 would improve evaluability.

Customer satisfaction

96 Highest impact

Exceptional average ratings from a massive review count demonstrate widespread consumer satisfaction and trust. Repetitive complaints are virtually non-existent, indicating a very reliable user experience over time.

Value for money

95 Highest impact

Extremely low cost per serving makes this formula an outstanding value for basic nutrient replenishment. Category competitiveness is high due to the combination of potent dosages and affordable pricing.

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Goals

Impact
Highest effect
A Goal FitA Strength of SupportB+ CoverageA+ Formula Quality

Vitamin D3, Vitamin K2 (Menaquinone-7), and Iodine from the Sea-Iodine complex provide a robust foundation for metabolic and cardiovascular health. Ingredients are meaningfully dosed to address common nutritional gaps in daily vitality and systemic resilience.

This targeted combination appears well-aligned with requirements for long-term mineral balance and metabolic rate regulation. The synergy between fat-soluble vitamins and essential trace elements ensures a high degree of biological utility for foundational health systems.

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Impact
Highest effect
A Goal FitA Strength of SupportB CoverageA+ Formula Quality

This formula provides 2100mcg of Vitamin K and 5000 IU of Vitamin D3 to support cardiovascular flexibility and hormonal maintenance. Vitamin K2 is critical for preventing arterial calcification, a hallmark of biological aging, by ensuring proper calcium distribution.

The addition of iodine supports metabolic health and thyroid function, key aspects of systemic vitality. It represents a coherent and meaningfully dosed strategy for addressing foundational drivers of physiological decline.

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Impact
Highest effect
A+ Goal FitA+ Strength of SupportB CoverageA Formula Quality

High-potency transport vitamins D3 and K2 provide the primary signaling required for efficient calcium metabolism and skeletal deposition. The inclusion of cholecalciferol and menaquinone-7 ensures that dietary minerals are effectively directed away from soft tissues and into the bone matrix.

A significant dose of sea-sourced iodine provides auxiliary support for thyroid health, which is a key metabolic regulator of bone remodeling. This formula excels at providing the high-value regulatory nutrients needed to manage mineral transport safely and effectively.

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Impact
Highest effect
A- Goal FitA- Strength of SupportC+ CoverageA+ Formula Quality

Vitamin K2 and Vitamin D3 provide focused support for arterial health by preventing calcium buildup in the vasculature. This combination appears well aligned with maintaining cardiovascular structure and function.

Providing a clinical dose of Vitamin K2 within a 2100mcg total complex offers robust support for heart health. The inclusion of iodine provides secondary metabolic support that may contribute to overall cardiovascular well-being.

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Impact
Highest effect
A Goal FitB+ Strength of SupportC CoverageA+ Formula Quality

This multi-nutrient formulation provides a potent dose of vitamin K and 125mcg of vitamin D3 to support cardiovascular and mineral health. Vitamin K, including the bioavailable MK-7 form, is essential for directing calcium away from the vascular walls, supporting arterial flexibility.

The inclusion of a significant iodine complex provides additional metabolic support, making this a comprehensive option for systemic health. With an exceptional price per serving, this formulation offers high value for individuals focused on long-term arterial and cardiovascular wellness.

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Impact
Highest effect
B+ Goal FitA- Strength of SupportD+ CoverageA Formula Quality

Ingredients include Vitamin D3, Vitamin K, and Sea-Iodine Complex. This combination focuses on foundational metabolic health and thyroid support.

Iodine is critical for the synthesis of thyroid hormones that regulate the body's basal metabolic rate. Vitamin D3 supports mitochondrial oxidative capacity, which appear well aligned with preventing systemic energy drain.

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Impact
High effect
B+ Goal FitA- Strength of SupportD CoverageB+ Formula Quality

Iodine is meaningfully dosed at 1,000 mcg to support thyroid hormone synthesis and resting energy expenditure. These hormones provide a baseline control for the body's entire metabolic system.

The supplement focuses on thyroid and bone health cofactors but does not address thermogenic or glycemic pathways. It provides focused support for those seeking to maintain healthy thyroid hormone levels through a potent iodine source.

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Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
125 mcg
Vitamin K
2100 mcg
Iodine (Sea-Iodine Complex Blend)
1000 mcg
Gluten Free Adults 18–50
Report overview
A- Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyB+ Value
This vitamin combination provides 1,000 mcg of iodine from a sea-iodine complex to support thyroid health alongside vitamins D and K. It is a potent dose that stays within safety limits but is above the RDA for standard maintenance.
Vitamin K · 2100 mcg OverallScore78
B+ Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyA+ Value
Life Extension's Vitamin D and K with Sea-Iodine is a highly bioavailable and cost-effective supplement. It uses high-quality Vitamin K forms but lacks full subtype transparency in its basic listing.
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