Life Extension Vitamin D3 and K with Sea-Iodine, 60 Capsules — Immune, Bone & Thyroid Support

Life Extension Vitamins D and K with Sea-Iodine combines vitamin D3, multiple forms of vitamin K, and iodine in a once-daily capsule to help support immune balance, healthy bones, and thyroid nutrient needs.

Many diets fall short on three nutrients that work together: vitamin D, vitamin K, and iodine. This Life Extension formula delivers vitamin D3 alongside vitamin K1 plus two forms of K2, and iodine sourced as Sea‑Iodine, in a convenient daily capsule. The blend is designed for people seeking a single supplement that addresses calcium balance and thyroid nutrient intake while contributing to the body’s normal immune and metabolic processes.

How does this supplement help maintain bone health?

Vitamin D3 supports calcium absorption, while vitamin K directs calcium into bone tissue rather than soft tissues. Including both vitamins helps preserve bone mineralization as part of an overall diet and lifestyle strategy.

• Vitamin D3 to promote calcium uptake from the gut
• Vitamin K1 and two K2 forms to support proper calcium utilization
• Once-daily capsule for consistent dosing

Why include iodine, and how does Sea-Iodine fit in?

Iodine is a trace nutrient needed for the body’s thyroid-related processes. Sea-Iodine provides a bioavailable source of iodine to help cover dietary shortfalls, particularly for those who avoid iodized salt or certain seafoods.

• Sea-Iodine as a concentrated iodine source
• Helps fill common dietary gaps in iodine intake
• Formulated to accompany vitamin D and K for complementary nutritional support

What forms of vitamin K are included and why does that matter?

This product contains vitamin K1 plus two types of vitamin K2 to provide a broader range of activity. Different K vitamers circulate and act in tissues differently; combining them supports comprehensive calcium management across the body.

• Vitamin K1 for standard dietary K support
• Two K2 forms (menaquinones) for extended tissue coverage
• Synergistic pairing with vitamin D3 for bone and calcium support

How should I use these capsules and what can I expect?

Take the capsule as directed on the label, typically once a day with food to enhance fat-soluble vitamin absorption. Results depend on baseline nutrient status, diet, and lifestyle; supplements are part of a broader approach to health.

• Once-daily dosing, ideally with a meal containing fat
• Manufactured in the USA with globally sourced ingredients
• Non-GMO and gluten-free majority of product line; Certificates of Analysis available

Who is this for: Life Extension Vitamins D and K with Sea-Iodine is suited for adults looking to support normal immune function, maintain bone mineral balance, and ensure adequate iodine intake for thyroid nutrient needs. It’s appropriate for people who want a combined, science-informed supplement rather than separate pills, especially those with lower dietary iodine or limited vitamin K and D exposure. As with any dietary supplement, consult a healthcare professional before starting if you are pregnant, nursing, taking medication, or have a medical condition.

Ingredients

Vitamin D3 (as cholecalciferol) 125 mcg Vitamin K activity from: 2100 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)] 1000 mcg Other ingredients: microcrystalline cellulose, vegetable cellulose (capsule), maltodextrin, food starch-modified, dicalcium phosphate, stearic acid, silica. Non-GMO