If you are looking to support your bone density, immune function, and calcium metabolism, vitamin D3 plus K2 is a powerhouse combination. Two of the most popular options on the market today are the Sports Research Vegan D3 + K2 line and the Life Extension Vitamins D and K with Sea-Iodine line. Each brand takes a distinct approach: Sports Research focuses on a clean, plant-based formula with coconut MCT oil, while Life Extension offers a more comprehensive blend that includes iodine and multiple forms of vitamin K. This guide will compare the two head-to-head so you can decide which fits your lifestyle best. For another detailed comparison, check out our analysis of Sports Research versus NOW D3 K2.
Pros
- Plant-based D3 from lichen, suitable for vegans and those with lanolin sensitivities.
- Moderate 2500 IU dose ideal for daily maintenance without the risk of over-supplementation.
- Includes vitamin K2 to direct calcium to bones and support heart health.
- Formulated with MCT oil for enhanced absorption of fat-soluble vitamins.
- Free from common allergens and artificial additives, with third-party testing for purity.
Cons
- The 60-count size may require more frequent repurchasing for those who prefer larger value sizes.
- Some users may find the softgels larger and harder to swallow, though this is subjective.
- The moderate 2500 IU dose may be too low for individuals with a diagnosed vitamin D deficiency needing higher therapeutic doses.
Sports Research Vegan Vitamin D3 + K2 offers a well-rounded, plant-based approach to daily wellness. This supplement is specifically designed for individuals following a vegan or vegetarian lifestyle, or anyone who prefers to avoid animal-derived ingredients like lanolin. It's also a great choice for those seeking a moderate, maintenance-level dose of vitamin D3 without the high amounts found in many other supplements.
The standout feature is its use of vitamin D3 sourced from wild-crafted lichen, a sustainable and truly vegan alternative. Combined with vitamin K2 and organic coconut MCT oil, this formula is designed for optimal absorption, ensuring you get the most benefit from each softgel. In real-world use, this translates to reliable daily support for immune function, bone health, and overall vitality, making it a simple addition to a health-conscious routine.
In terms of design, the Plantgels™ are easy to swallow and have a minimal aftertaste, which is a plus for those sensitive to supplements. The packaging is clean and functional, clearly listing all ingredients and certifications. The product is also Non-GMO Project Verified and free from common allergens like gluten and soy, which adds to its appeal for those with dietary restrictions.
While the 60-count bottle is convenient, heavy users might find themselves reordering frequently. Additionally, the 2500 IU dose is on the lower end, so those with a known deficiency should consult a healthcare provider for a higher-potency option. However, for everyday maintenance and preventive support, this strength is often ideal.
Overall, Sports Research Vegan Vitamin D3 + K2 is a high-quality, transparently sourced supplement that delivers on its promises. It's a fantastic choice for vegans, vegetarians, and anyone seeking a clean, effective daily D3 and K2 combo. The brand's commitment to third-party testing and clean ingredients makes it a trustworthy option in a crowded market.
Pros
- Combines four key nutrients (D3, K1, K2, iodine) in one capsule for simplified daily supplementation.
- High vitamin D3 dose (5000 IU) suitable for those with deficiency or limited sun exposure.
- Includes both forms of vitamin K2 (MK-4 and MK-7) for balanced cardiovascular support.
- Sea-iodine sourced from kelp provides natural trace mineral support for thyroid.
- Pack of two bottles offers long-lasting value and convenience.
Cons
- Capsules may be large for some individuals to swallow easily.
- High vitamin D3 dose (5000 IU) exceeds the daily recommended intake for most adults; consult a healthcare professional before use.
- Contains iodine, which can be problematic for those with thyroid conditions or iodine sensitivity.
Life Extension Vitamins D and K with Sea-Iodine is a comprehensive supplement designed to support bone strength, heart health, and thyroid function. It is ideal for adults who want a convenient once-daily capsule that delivers vitamin D3, vitamins K1 and K2, and iodine in one formula.
The standout feature is the inclusion of both MK-4 and MK-7 forms of vitamin K2, which are known to help direct calcium to bones and away from arteries. Combined with 5000 IU of vitamin D3, this formula optimizes calcium utilization. The addition of sea-iodine from kelp provides a natural source of this essential nutrient for thyroid hormone production.
Life Extension is a reputable brand that emphasizes quality control. Each batch undergoes testing and a Certificate of Analysis is available. The supplements are gluten-free and non-GMO, manufactured in the USA. The pack of two 90-capsule bottles ensures a long-lasting supply without frequent reordering.
Potential drawbacks include the large capsule size, which may be difficult for some people to swallow. The 5000 IU dose of vitamin D3 is higher than the standard 600-800 IU recommended for most adults, so medical guidance is advised. Additionally, those with iodine sensitivities or thyroid disorders should consult a doctor before use.
Overall, Life Extension Vitamins D and K with Sea-Iodine is a well-rounded formulation that addresses multiple health concerns with a single daily pill. The quality ingredients and transparent manufacturing add to its appeal. It is a solid choice for those seeking targeted nutritional support for bones, heart, and thyroid.
Vitamin D3: 125 mcg (5,000 IU)
Vitamin K1: 1,000 mcg
Vitamin K2 (MK-4): 1,000 mcg
Vitamin K2 (MK-7): 100 mcg
Sea-Iodine: 1,000 mcg
Servings Per Bottle: 90 (90 capsules)
Pack Size: 2 bottles (180 capsules total)
Pros
- Combines three often-deficient nutrients in one capsule: vitamin D, vitamin K, and iodine.
- Includes multiple forms of vitamin K for better absorption and bone health benefits.
- Backed by a reputable brand with a focus on scientific formulation and quality testing.
- Non-GMO, gluten-free, and manufactured in the USA.
- Suitable for those following a low-salt diet who may lack iodine from table salt.
Cons
- Capsules may be larger than some users prefer; check size before swallowing.
- Contains iodine, which may not be suitable for individuals with thyroid conditions without medical advice.
- Some users might need to take additional vitamin D if they have higher requirements; check with a healthcare provider.
The Life Extension Vitamins D and K with Sea-Iodine is a targeted daily supplement designed for adults who want to fill common nutritional gaps. It combines vitamin D3, vitamin K (K1 plus two forms of K2), and iodine from seaweed, making it a convenient all-in-one solution for immune, bone, and thyroid health.
What sets this formula apart is its inclusion of both vitamin K1 and two types of vitamin K2 (MK-4 and MK-7). This combination helps ensure calcium is properly directed to bones and teeth rather than accumulating in arteries, a key factor for long-term cardiovascular and skeletal wellness. The addition of sea-iodine supports thyroid hormone synthesis, which regulates metabolism and energy levels.
Each capsule is manufactured in the USA with non-GMO, gluten-free ingredients. Life Extension provides a Certificate of Analysis for every batch, so you can trust the potency and purity. The capsules have a beige color and are moderately sized; they may be a bit large for some, but they are easy to swallow with water.
One potential drawback is the iodine content: individuals with hyperthyroidism or those on certain medications should consult a doctor before use. Also, while 60 capsules offer a two-month supply at one capsule per day, users with higher vitamin D needs may need an additional supplement.
Overall, this is a well-researched, high-quality supplement that delivers three essential nutrients in one dose. It is ideal for anyone looking to support their immune system, bone density, and thyroid function without taking multiple pills. For the price, it offers excellent value and peace of mind from a trusted brand.
Pros
- Vegan-friendly formulation using lichen-derived D3 and fermented chickpea K2.
- Includes coconut MCT oil to enhance absorption of fat-soluble vitamins.
- Third-party tested and certified Non-GMO and Vegan.
- Convenient once-daily dosage with high potency (5000 IU D3, 100 mcg K2).
- Free from common allergens like gluten and soy.
Cons
- Price is higher than some synthetic D3+K2 supplements.
- Softgel size may be large for those who have difficulty swallowing pills.
- 5000 IU D3 may be too high for individuals with certain health conditions; consult a healthcare provider.
Sports Research Vegan Vitamin D3 + K2 combines two essential fat-soluble vitamins in a plant-based softgel. This formula is designed for vegans and anyone seeking a clean, high-quality supplement that supports bone density, immune function, and cardiovascular health.
The standout feature is the sourcing: vitamin D3 comes from lichen (a vegan alternative to lanolin), and vitamin K2 (as MK-7) is derived from fermented chickpeas. The addition of coconut MCT oil aids absorption, making these nutrients more bioavailable. Each softgel provides 5000 IU of D3 and 100 mcg of K2, a potent once-daily dose.
In terms of quality, Sports Research has third-party tested each batch and earned Vegan and Non-GMO certifications. The softgels are free from gluten, soy, carrageenan, and artificial fillers. The product is manufactured in a cGMP-compliant facility in the USA.
A potential drawback is the cost, which is higher than many synthetic D3+K2 supplements. Also, the 5000 IU D3 dose may be excessive for those with lower requirements. The softgel size is average but may still be challenging for some users.
Overall, this is an excellent choice for vegans and health-conscious individuals who want a transparent, plant-based D3+K2 supplement. It delivers clinical-strength dosing with clean ingredients, making it a reliable addition to a daily wellness routine.
Color: No Color
Size: 120 Count (Pack of 1)
Dimensions: 2.4 x 2.13 x 4.2 inches
Weight: 0.18 pounds
Product Group: Drugstore
Binding: Health and Beauty
Pros
- 100% vegan vitamin D3 from lichen, not lanolin
- Combines D3 and K2 for synergistic bone and heart benefits
- Coconut oil base enhances absorption of fat-soluble nutrients
- Free from common allergens and artificial additives
- Trusted brand with third-party testing
Cons
- Limited customer reviews available to gauge long-term satisfaction
- Price may be higher compared to synthetic vitamin D3 supplements
- Requires consistent daily use to see noticeable benefits
The Sports Research Vegan Vitamin D3 + K2 with Coconut Oil is a plant-based dietary supplement designed for individuals seeking a clean, effective way to support bone density, immune function, and cardiovascular health. This product is ideal for vegans, vegetarians, or anyone avoiding animal-derived ingredients, as it uses vitamin D3 from lichen rather than the traditional lanolin source.
Standout features include the combination of vitamin D3 (2,500 IU per serving) and vitamin K2 as MK-7 (100 mcg), which work together to optimize calcium utilization. The addition of organic coconut oil in the Plantgels helps improve absorption of these fat-soluble vitamins, making each dose more effective. The capsules are small and easy to swallow, which is a plus for daily compliance.
In terms of design and build quality, Sports Research has a reputation for third-party testing and clean manufacturing. The Plantgels are free from gluten, soy, and GMOs, aligning with a clean-label philosophy. The bottle contains 60 servings at the recommended dosage, providing a two-month supply.
A potential drawback is the lack of customer reviews at launch, making it harder to assess real-world performance. Additionally, the price point is slightly higher than synthetic alternatives, though the premium ingredients justify the cost for those prioritizing vegan sourcing. As with any supplement, results require consistent use over time.
Overall, the Sports Research Vegan Vitamin D3 + K2 with Coconut Oil is a well-formulated, trustworthy choice for anyone seeking a plant-based D3 and K2 combo. Its thoughtful ingredient synergy and clean profile make it a strong contender in the supplement market, especially for health-conscious vegans and those with dietary restrictions.
Buying Guide
Form and Dietary Suitability
If you follow a vegan or plant-based diet, the source of vitamin D3 matters. Sports Research derives its D3 from wild-crafted lichen, making it genuinely vegan. It also uses organic coconut MCT oil to improve absorption. In contrast, Life Extension uses standard D3 from lanolin, which is not suitable for vegans. Each brand offers clean labels, but Sports Research is the clear winner for plant-based consumers.
Potency and Nutrient Profile
Sports Research offers two strengths: a 2500 IU version (60 count) and a 5000 IU version (60 or 120 count). Both include 100 mcg of vitamin K2 as MK-7, the most bioavailable form. Life Extension’s formulas are more complex: their standard product delivers 5000 IU of D3, 1000 mcg of K1, 1000 mcg of K2 as MK-4, and 100 mcg of K2 as MK-7, plus 1000 mcg of iodine from sea-iodine. This makes Life Extension a better choice for those wanting broader nutrient support, especially for thyroid health. However, the higher K1 and MK-4 amounts may not be necessary for everyone.
Quality Certifications and Purity
Both brands emphasize quality. Sports Research is Non-GMO Project Verified, Vegan Certified, and free of carrageenan, gluten, and soy. Their manufacturing is cGMP compliant and third-party validated for purity. Life Extension uses non-GMO, gluten-free ingredients and offers a Certificate of Analysis for each batch. Both are trustworthy, but Sports Research carries additional vegan and non-GMO certifications that may appeal to strict plant-based users. For another look at top-tier supplement quality, read our comparison of Sports Research and Thorne D K2.
Dosing Simplicity vs. Comprehensive Coverage
Sports Research keeps it simple: one softgel per day delivers a moderate or high dose of D3 plus K2. Life Extension requires one capsule per day but provides a more complex mix of multiple K vitamins and iodine. If you prefer a streamlined supplement or already take a separate iodine source, Sports Research may be less redundant. If you want to cover more bases with a single pill, Life Extension is more thorough. Always check your existing supplement stack to avoid overloading on iodine or vitamin K.
When considering cardiovascular support, proper calcium metabolism is key. Both D3 and K2 help direct calcium to bones rather than arteries. For more on circulation and vascular health, see our guide on supplements for healthy blood flow and natural circulation support strategies.
Final Thoughts
Choosing between Sports Research and Life Extension ultimately comes down to your dietary preferences and nutrient needs. For vegans or anyone wanting a pure, plant-sourced D3 plus K2 with a clean ingredient list, the Sports Research Vegan Vitamin D3 + K2 w/Coconut is your best bet. For those who want a more comprehensive formula that also supports thyroid function with iodine and includes multiple K forms, the Life Extension Vitamins D and K with Sea-Iodine covers more ground in a single capsule. Both are high-quality choices that can support your bone, immune, and cardiovascular health throughout 2026.
Frequently Asked Questions
What is the difference between vitamin D3 and vitamin K2?
Vitamin D3 helps your body absorb calcium from food, while vitamin K2 directs that calcium into your bones and teeth rather than allowing it to deposit in soft tissues like arteries. They work together synergistically for optimal bone and heart health. Many supplements now combine them.
Can I take vitamin D3 and K2 without additional iodine?
Absolutely. Iodine is a separate nutrient important for thyroid hormone production. If you already get iodine from sea vegetables, iodized salt, or a multivitamin, you can choose a D3+K2 formula without iodine, such as Sports Research. Life Extension includes iodine for those who want a combined product. Assess your total iodine intake before deciding.
Which is better for vegans in 2026?
Sports Research is the only vegan option between the two because its D3 is sourced from lichen rather than lanolin. Life Extension uses lanolin-derived D3. If you follow a strict plant-based diet, go with Sports Research. For a deeper look at plant-based nutrition, explore our natural circulation support advice.
How do I choose between 2500 IU and 5000 IU of vitamin D3?
Your choice depends on your current vitamin D levels, sun exposure, and health goals. A 2500 IU daily dose is generally sufficient for maintenance and mild deficiency. A 5000 IU dose is better if you have low levels or need a higher amount. Always consult your healthcare provider to determine the right potency for you, especially if you take other medications.
