Life Extension

Life Extension Vitamins D and K with SeaIodine Bone Brain Thyroid Arterial Support Non GMO Once Daily Gluten

4.7(4,336)

50+ bought in the past month

$14.97$24.00

About this item

STRONG BONES, HEALTHY HEART – This formula provides a potent 125 mcg of vitamin D3 which helps promote healthy cognitive function. Vitamin D, along with vitamin K, helps get calcium into your bone matrix to maintain strong, healthy bones and teeth. Vitamin D also plays a critical role in healthy immune function and vitamin K helps inhibit calcium buildup in your arteries.
CHANCES ARE YOU’RE NOT GETTING ENOUGH VITAMIN K – You can get vitamin K1 and K2 from your diet, but most people don’t get enough K-rich foods, such as leafy greens, cheese, or eggs daily. This formula provides a potent dose, 2100 mcg of Vitamin K1 and two forms of vitamin K2.
HEALTH BENEFITS OF TABLE SALT, WITHOUT THE SODIUM – Iodine is essential to thyroid health. So much so, it has been added to table salt for almost 100 years. But many people avoid salt for health reasons, which can lead to inadequate iodine intake from your diet. Our formula delivers iodine from sea vegetables.
INGREDIENTS MATTER -Sourced using only the finest raw ingredients with the purityand potency your body deserves. The majority of our products are non-GMO, gluten-free and manufactured in the USA—and a Certificate of Analysis is available for every product we produce.
LIVE YOUR HEALTHIEST LIFE - For over 40 years, we’ve been developing advanced, effective formulas made with the highest standards and based on the latest scientific findings. We believe the answers to a healthier, richer life are within reach, and that rigorous scientific research is the path to get us there. Our formulations are created using the ingredients and dosages used in the studies that inspired them, ensuring that maximum bioavailability and efficacy is achieved.

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Product details

Brand	Life Extension
Item Form	Whole Bean
Primary Supplement Type	Iodine, Vitamin D3, Vitamin K
Diet Type	Gluten Free
Flavor	Unflavored

Technical specifications

is_discontinued_by_manufacturer	No
product_dimensions	2.09 x 2.09 x 3.73 inches; 1.6 ounces
item_model_number	02040
date_first_available	October 4, 2017
manufacturer	Life Extension
best_sellers_rank	#2,837 in Health & Household ( See Top 100 in Health & Household ) #37 in Vitamin D Supplements

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Customer reviews

4.74,336 ratings

Customers say

Customers find this vitamin supplement effective for bone and thyroid health, with a perfect vitamin D level and good value.

★★★★★

Vitamin D & K with Sea-Iodine

Zark—April 22, 2025

I’ve been using Life Extension Vitamins D and K with Sea-Iodine for a couple of months, and I’m very pleased with the results. The combination of vitamin D3, multiple forms of vitamin K, and iodine makes this supplement stand out, as it supports not only immune and bone health but also thyroid function and overall wellness. I appreciate that the capsules are small and easy to swallow, with no noticeable taste, which makes them convenient for daily use. Since starting this supplement, I’ve noticed improvements in my energy levels and a general sense of well-being, which I attribute to the balanced blend of nutrients. My vitamin D levels, which were previously low, have returned to normal, and my nails and hair also seem healthier. The inclusion of sea-iodine is a thoughtful touch, especially for those who don’t get enough iodine from their diet. Overall, this is a high-quality, non-GMO, and gluten-free product that delivers on its promise to support immune, bone, arterial, and thyroid health. Read more

★★★★★

Best Vitamin D with K for a Reasonable Price- Reordered 5 Times Already

Kat McDonald—December 22, 2025

Life Extension Certainly did Not let Us down with this Vitamin D with K Supplement. Excellent Quality with no bad smell or taste. BUT It is quite a Large Solid Oval Pill (in case Swallowing is an issue for the intended User.) It has become a staple in Our Family Supplement regimen! Read more

★★★★★

As usual good enough

joonred—October 18, 2025

I subscribe this one. good enough i satisified this D&K with iodine. Read more

★★★★★

Helps with bones and thyroid function. Not synthetic, gentle on stomach.

Elizabeth C.—October 31, 2025

According to my labs now my vitamin D LEVEL is perfect. Since I have osteoporosis and live in the Northeast with lack of sunlight unless it’s summer, I ordered this to stay healthy in my senior years. I also have low thyroid and take synthroid. Those levels have been great too. I don’t drink milk and have GI absorption issues so needed one gentle on the gut. This item checked off all the boxes. Highly recommend. Read more

★★★★☆

Good combo vitamin.

Jenny from Philly—May 27, 2025

Good product Read more

★★★★★

Great Combination of D3 and K2 for Better Absorption

Kevin—July 21, 2025

This D3 and K2 vitamin supplement is a great addition to my daily routine. I like that it combines both vitamins, as they work together to help with calcium absorption and support bone and heart health. The capsules are a good size and easy to swallow. I also appreciate that the ingredients are high quality, and there’s no unpleasant aftertaste. Read more

★★★★★

Subscriber

Kate—January 12, 2026

Take daily. Great value for price. Read more

★★★★★

Blood tests show they work.

cj—December 4, 2025

My D levels were low, shown on blood test, so my dr put me on it. I bought these and took them for 3 months, retested w blood test, and levels are normal. So they work, at least for me! Also you do need some exposure to natural sunlight for your body to be able to utilize D. Read more