Vitamin D3 with Sea-Iodine, 125 mcg (5,000 IU): Strong Immunity, Healthy Bones and Teeth, Hormonal Balance and Thyroid Support – Advanced Formula with Cholecalciferol and Organic Marine Iodine

Vitamin D3 with Sea-Iodine, 125 mcg (5,000 IU), Life Extension is a premium dietary supplement designed to support two of the body's most important regulatory systems: immunity and metabolic-hormonal balance. The formula combines vitamin D (as cholecalciferol) in high dose, 125 µg (5,000 IU), with iodine in precise concentration, 1,000 mcg, derived from the Sea-Iodine™ complex blend (organic kelp and bladderwrack extracts, supplemented with potassium iodide). This association is not coincidental: vitamin D3 is a major regulator of gene expression involved in immune defense, bone health and muscle function, and iodine is a key element in thyroid hormone synthesis, which controls metabolic rate, thermoregulation, energy and overall vitality state.

In modern lifestyle, reduced sun exposure, predominantly indoor work and constant use of photoprotection can limit cutaneous vitamin D production. In parallel, iodine intake can vary significantly depending on diet, quality of marine sources and use of iodized salt. An optimal level of vitamin D and adequate iodine availability can make the difference between a body functioning "on emergency mode" and one that responds efficiently to challenges: cold season, stressful periods, increased physical effort, restrictive diets or special metabolic needs. Through this concentrated formula, Life Extension offers targeted support for maintaining homeostasis, that state of internal balance in which body systems communicate efficiently and adjust quickly.

Vitamin D3 (cholecalciferol) is the preferred form for supplementation due to its biological efficiency and direct role in maintaining blood 25(OH)D levels. It influences calcium and phosphorus absorption, supports bone remodeling and contributes to normal muscle function. At the same time, vitamin D acts as an immunomodulatory "hormone", helping the body maintain balanced immune response: active enough for protection, but without tendency to deregulate into persistent inflammation.

Iodine from the Sea-Iodine™ complex completes the formula by supporting the thyroid. Thyroid hormones, T3 and T4, are built on iodine's backbone and influence almost every cell: oxygen consumption, energy production, body temperature, lipid and glucose metabolism, mood and concentration capacity. The presence of organic kelp and bladderwrack extracts (marine sources) brings a "whole-food" dimension, meant to offer a more complex profile of marine compounds, while potassium iodide contributes to dosing precision.

Detailed Benefits of Vitamin D3 with Sea-Iodine

• Supporting immunity and body's defense response

The immune system needs clear signals to recognize and manage environmental challenges. Vitamin D3 contributes to normal immune cell function and to maintaining balanced immune response.

✅ support for immunity during cold season and demanding periods
✅ supporting adaptive and innate immune response
✅ support for body's inflammatory balance

• Bone health, teeth and efficient mineral absorption

Vitamin D is essential for calcium and phosphorus absorption, fundamental minerals for bone density and tooth strength. Adequate intake supports maintaining bone structure and normal mineralization processes.

✅ support for bone mineral density
✅ maintaining teeth health and skeletal structure
✅ supporting calcium-phosphorus balance, important in all life stages

• Muscle function, mobility and physical recovery

Vitamin D has a direct role in muscle function. Optimal levels are associated with better contractility, coordination and better muscle tone support, which matters both for active people and for those who want to maintain long-term mobility.

✅ support for strength and muscle control
✅ supporting mobility and postural stability
✅ support for recovery after effort and maintaining vitality

• Thyroid support and metabolism regulation through iodine intake

Iodine is indispensable for thyroid hormone synthesis, which dictates metabolism "speed". Adequate iodine intake supports normal thyroid function, influencing energy level, mental clarity and thermoregulation.

✅ supporting thyroid hormone synthesis
✅ support for metabolic rate and daily energy
✅ contribution to maintaining endocrine balance

• Energy balance and mental clarity through D3 + iodine synergy

"Diffuse" fatigue can have multiple causes, and two of the most common functional bases are vitamin D insufficiency and inadequate iodine intake. Their association in a concentrated formula targets both the immune-muscular component and the metabolic-thyroid component.

✅ more consistent energy and resilience during busy periods
✅ supporting mental clarity and concentration
✅ support for adapting to daily stress, by optimizing basic functions

• Support for cardiovascular health and inflammatory balance

Vitamin D is involved in endothelial function and in regulating some inflammatory processes, and thyroxine and triiodothyronine influence lipid metabolism and energy use at cellular level. Maintaining optimal levels contributes to a more stable metabolic profile.

✅ supporting vascular function and general balance state
✅ contribution to maintaining healthy metabolism
✅ support for body in context of low-intensity inflammation associated with modern lifestyle

Vitamin D3 with Sea-Iodine, 125 mcg (5,000 IU), Life Extension is a complete formula for those pursuing immunity support, bone and muscle health, plus well-defined thyroid support, in a combination designed for metabolic performance and body balance in modern life's rhythm.



 

Directions for Use

Read the entire label and carefully follow directions before use.
Take one (1) capsule daily with food or as recommended by a healthcare practitioner.
Do not exceed recommended dose.



 

Other Ingredients

Microcrystalline cellulose, vegetable cellulose (capsule), maltodextrin, modified food starch, silica, stearic acid.

Warnings

Individuals consuming more than 50 mcg (2,000 IU)/day of vitamin D (from diet and supplements) should obtain periodic serum measurement of 25-hydroxy vitamin D. Do not exceed 10,000 IU per day unless recommended by your healthcare practitioner. Vitamin D supplementation is not recommended for individuals with high blood calcium levels. If you have a thyroid condition or are taking antithyroid medications, do not use without consulting your healthcare practitioner.
Keep out of reach of children.
Do not purchase if outer seal is broken or damaged.
When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.
Keep tightly closed in a cool, dry place.