Vitamin D3 with Sea-Iodine 5000 60 Capsules by Life Extension combines 125 mcg (5,000 IU) of vitamin D3 as cholecalciferol with 1,000 mcg of iodine from a proprietary Sea-Iodine complex to support bone density, immune function, thyroid function, and healthy inflammatory response in a single daily capsule.
Key Benefits of Vitamin D3 and Sea-Iodine Complex Ingredients
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Vitamin D3 as Cholecalciferol (125 mcg / 5,000 IU) - Supports calcium absorption, bone density, cell differentiation, and immune system function at a clinically relevant daily dose
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Sea-Iodine Complex (1,000 mcg Iodine) - Delivers iodine from a blend of organic kelp extract, bladderwrack extract, and potassium iodide to support healthy thyroid hormone production and thyroid function
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Dual-Nutrient Thyroid and Bone Support - Vitamin D3 and iodine address two distinct but complementary nutritional needs, supporting both skeletal integrity and thyroid hormone synthesis in a single capsule
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Immune Function Support - Vitamin D3 plays a central role in modulating immune cell activity and supports a healthy immune response across multiple immune system pathways
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Healthy Inflammatory Response - Maintaining optimal vitamin D levels supports a balanced inflammatory response and promotes healthy endothelial function
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Cognitive and Neurological Support - Adequate vitamin D status is associated with supporting cognitive function and neurological health across the lifespan
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Iodine Sufficiency Support - Sea-Iodine addresses the common gap in iodine intake associated with reduced consumption of iodized salt and seafood in modern dietary patterns
Why This Formula Matters
Vitamin D deficiency and iodine insufficiency are two of the most prevalent micronutrient gaps in modern populations, yet they are rarely addressed together in a single, well-dosed formula. Life Extension's Vitamin D3 with Sea-Iodine delivers 5,000 IU of D3, a dose that research suggests many adults require to maintain optimal serum 25-hydroxy vitamin D levels, alongside a meaningful 1,000 mcg iodine dose from organic sea algae sources. The Sea-Iodine complex uses both whole-food algae extracts and potassium iodide to provide iodine in complementary forms, supporting thyroid hormone synthesis and overall iodine status.
Dietary & Quality Standards
- Non-GMO
- Gluten-free
- Vegetable cellulose capsule (suitable for vegetarians)
- Sea-Iodine from organic kelp and bladderwrack extracts plus potassium iodide
- No artificial colors, flavors, or preservatives
- 60 capsules per bottle (60-day supply at 1 capsule daily)
Frequently Asked Questions
What is Sea-Iodine and how does it differ from standard iodine supplements?
Sea-Iodine is a proprietary iodine complex that combines organic kelp extract, bladderwrack extract, and potassium iodide. This multi-source approach delivers iodine from both whole-food sea algae and a purified mineral salt form, providing complementary iodine sources in a single serving rather than relying on a single synthetic iodine compound.
Who may benefit from 5,000 IU of vitamin D3 daily?
Many adults require higher vitamin D3 doses to maintain optimal serum 25-hydroxy vitamin D levels, particularly those with limited sun exposure, darker skin tones, or higher body weight. Individuals consuming more than 2,000 IU daily should periodically monitor serum vitamin D levels. Consult your healthcare practitioner to determine the appropriate dose for your individual status.
Is this product appropriate for individuals with thyroid conditions?
Individuals with a thyroid condition or those taking antithyroid medications should consult their healthcare practitioner before using this product due to its iodine content. Do not use without professional guidance in these cases.
How should this product be taken?
Take one capsule daily with food, or as recommended by a healthcare practitioner. Do not exceed 10,000 IU of vitamin D per day from all sources unless directed by a physician. Vitamin D supplementation is not recommended for individuals with elevated blood calcium levels.
Can this product be taken alongside a multivitamin?
If you are already taking a multivitamin or other supplements containing vitamin D or iodine, review your total daily intake of both nutrients before adding this product. Consult your healthcare practitioner to avoid unintended overlap, particularly at higher vitamin D doses.
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
