Core Longevity's Top 3 Vitamin D3 +K2 Supplements
At Core Longevity, we carefully selected our Top 3 Vitamin D3 + K2 supplements using the principles that guide every product we review: Quality, Purity and Purpose.
For this category, we looked beyond simply choosing the highest dose. Instead, we focused on the forms of Vitamin D and K2 used, ingredient quality, overall formulation, unnecessary additives and evidence of manufacturing or quality-testing standards.
Our Top 3 — Together Health, Time Health and British Supplements — were chosen because each offers a different approach while remaining closely aligned with our focus on clean and purposeful supplementation.
Together Health Vitamin D3 + K2 takes our number-one position because of its particularly thoughtful approach to sourcing and quality. It combines vegan Vitamin D3 from lichen with Vitamin K2 in the MK-7 form from fermented chickpeas, alongside coconut oil, which serves a clear purpose within the formulation. Together Health also makes batch-testing information available, strongly supporting our focus on transparency and verified quality.
Time Health Vitamin D3 + K2 earns its place because of its high-strength, plant-based formula. The product provides Vitamin D3 alongside Vitamin K2 in the MK-7 form while avoiding synthetic bulking and anti-caking agents. It is also manufactured to GMP standards and made in the UK, making it a strong option for those looking for a clean, higher-strength formulation.
British Supplements Vitamin D3 + K2 completes our Top 3 because of its strong commitment to avoiding fillers, binders and other unnecessary additives. Its formula takes a significantly higher-potency approach and also includes MSM as an active ingredient. We included it as an option for those specifically looking for a high-strength product, while recognising that a higher dose does not automatically make a supplement better or more appropriate for everyone.
For Core Longevity, the goal is not simply to find the strongest product or the most expensive product. We want to understand exactly what is inside each supplement, why each ingredient is included and whether the overall formula reflects our principles of Quality, Purity and Purpose.
Together, these three products give consumers a choice between natural sourcing and transparent testing, a clean high-strength plant-based formula and a high-potency option without unnecessary fillers.
Our aim is simple: to find supplements that support the foundations of long-term everyday health while keeping ingredients transparent and unnecessary extras to a minimum.
together health VITAMIN D3 & K2
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At Core Longevity, we chose Together Health Vitamin D3 + K2 as our number-one choice because it closely reflects the principles that guide all of our supplement selections: Quality, Purity and Purpose.
Each capsule provides 3,000 IU (75μg) of Vitamin D3 and 100μg of Vitamin K2 in the MK-7 form. What particularly stands out is the sourcing: the Vitamin D3 is derived from lichen, while the Vitamin K2 is sourced from fermented chickpeas. The formula also includes coconut oil, which has a clear purpose because Vitamins D and K are fat-soluble.
Purity is another major reason we selected this product. Together Health avoids artificial additives and processing aids, while keeping the formula focused on ingredients with a clear role. The product uses a vegetable capsule and is suitable for those looking for a plant-based Vitamin D3 + K2 option.
Quality assurance is where Together Health particularly stands out. The company states that every batch is independently tested by accredited third-party laboratories, and batch reports are made available to consumers. A recent Certificate of Analysis for this specific product confirmed that the stated levels of Vitamin D3 and Vitamin K2 conformed to the product specification.
For Core Longevity, this is exactly what we look for: transparent ingredients, purposeful sourcing, a clean formulation and evidence of independent quality testing. Rather than simply providing a high dose, Together Health has created a formula in which each ingredient has a clear reason for being included.
Overall, its combination of plant-based sourcing, MK-7 Vitamin K2, a purposeful coconut-oil base, minimal unnecessary ingredients and independently available batch testing makes it one of the strongest Vitamin D3 + K2 supplements we found.
Core Longevity Rating
Purity: ★★★★★ 10/10
Clean Formula: ★★★★★ 9.8/10
Price & Value: ★★★★★ 9.5/10
Verified Quality: ★★★★★ 10/10
Purpose: ★★★★★ 10/10
Overall: ★★★★★ 9.9/10
Core Longevity Verdict:
A high-quality, clean and thoughtfully formulated Vitamin D3 + K2 supplement that strongly reflects the Core Longevity principles of Quality, Purity and Purpose.
We particularly like the use of plant-based Vitamin D3 from lichen, Vitamin K2 in the highly researched MK-7 form and coconut oil as a purposeful carrier for the fat-soluble vitamins. Every ingredient has a clear role, while the absence of unnecessary artificial additives is a major positive.
The strongest feature, however, is Together Health's commitment to independent batch testing and transparency. The availability of batch reports gives us additional confidence that the product's quality claims are supported by independent verification.
Overall, Together Health offers an excellent combination of thoughtful sourcing, clean formulation, transparent ingredients and verified quality, making it a particularly strong fit with the Core Longevity principles.
TIME HEALTH D3 + K2
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At Core Longevity, we chose Time Health Vitamin D3 + K2 as one of our Top 3 because of its strong focus on high-quality ingredients, clean formulation and purposeful dosing.
Each capsule provides 4,000 IU (100μg) of Vitamin D3 as cholecalciferol alongside 100μg of Vitamin K2 as K2VITAL® MK-7. We particularly like the use of the MK-7 form of Vitamin K2 and the clearly stated amounts of both active ingredients, making it easy to understand exactly what the product provides.
The formula is also exceptionally simple. The active ingredients are contained in a pullulan capsule derived from tapioca, and Time Health states that the product contains no synthetic bulking or anti-caking agents. The product is also vegan, gluten-free and manufactured to GMP standards in the UK.
For Core Longevity, one of the biggest strengths of this product is that every ingredient has a clear purpose. There are no flavourings, added sugars or unnecessary complex blends. Instead, the formula focuses on providing a high-strength combination of Vitamin D3 and Vitamin K2 in a clean, straightforward capsule.
The product also uses branded ingredients, including CULTAVIT® Vitamin D3 and K2VITAL® MK-7, which adds further transparency around the specific forms and sources of the active ingredients.
For us, Time Health earns its place in the Top 3 because it combines meaningful doses, recognised ingredient forms, a minimalist formulation and UK GMP manufacturing. It is a particularly strong choice for people looking for a high-strength Vitamin D3 + K2 supplement without unnecessary extras.
As always, we would emphasise that higher strength does not automatically mean better or more appropriate for everyone. Vitamin D supplementation should be considered in the context of individual needs and dietary intake.
to the formulation.
Core Longevity Rating
Purity: ★★★★★ 9.5/10
Clean Formula: ★★★★★ 10/10
Price & Value: ★★★★★ 9.5/10
Verified Quality: ★★★★★ 9.5/10
Purpose: ★★★★★ 10/10
Overall: ★★★★★ 9.7/10
Core Longevity Verdict:
A clean, high-strength and purpose-driven Vitamin D3 + K2 supplement that strongly reflects the Core Longevity principles of Quality, Purity and Purpose.
We particularly like the simple ingredient list, transparent dosing and absence of unnecessary fillers or synthetic bulking agents. The use of branded Vitamin D3 and MK-7 Vitamin K2 ingredients also provides additional transparency around the specific forms used in the formula.
The main consideration is the 4,000 IU (100μg) dose of Vitamin D3, which is higher than many standard daily supplements. Higher strength does not automatically mean a product is better or more appropriate for everyone, and individual requirements can vary. For those specifically looking for a higher-strength D3 + K2 formulation, however, Time Health offers a particularly clean and straightforward option.
BRITISH SUPPLEMENTS CLEAN VITAMIN D3 + K2
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At Core Longevity, we chose British Supplements Vitamin D3 + K2 as one of our Top 3 because of its strong focus on high potency and a clean, no-unnecessary-extras formulation.
Each capsule provides 10,000 IU (250μg) of Vitamin D3, 438μg of Vitamin K2 in the MK-7 form and 478mg of MSM. The Vitamin D3 is sourced from lanolin, while the Vitamin K2 is derived from natto.
One of the biggest reasons this product fits the Core Longevity principles is the company's commitment to avoiding unnecessary ingredients. British Supplements states that the formula contains no fillers, binders, anti-caking agents, artificial colours, flavourings or sweeteners. Instead, the formula focuses on three clearly identified active ingredients, with MSM included as a purposeful part of the formulation rather than simply being used as an inactive bulking ingredient.
For Core Longevity, this makes British Supplements an interesting option for those specifically looking for a high-strength Vitamin D3 + K2 formula with an additional active ingredient. However, we also believe it is important to recognise that more is not always better.
The 10,000 IU (250μg) Vitamin D3 dose is significantly higher than that found in many everyday Vitamin D supplements, meaning this product is better viewed as a high-potency option rather than a general-purpose choice for everyone. Individual requirements vary, and high-dose Vitamin D supplementation should be approached thoughtfully.
Overall, British Supplements earns its place in our Top 3 because of its transparent high-potency formulation, clean ingredient list and commitment to avoiding unnecessary fillers and additives, while its exceptionally high Vitamin D3 dose is an important consideration when comparing it with our other choices.
Core Longevity Rating
Purity: ★★★★★ 9.5/10
Clean Formula: ★★★★★ 9.5/10
Price & Value: ★★★★★ 9.5/10
Verified Quality: ★★★★½ 9/10
Purpose: ★★★★★ 9.5/10
Overall: ★★★★★ 9.4/10
Core Longevity Verdict:
A clean and high-strength formula that strongly reflects the Core Longevity preference for avoiding unnecessary fillers and additives.
We particularly like the use of Vitamin K2 as MK-7, the transparent ingredient list and British Supplements' clear commitment to keeping unnecessary binders, fillers and other additives out of the formula. The addition of MSM also provides another active ingredient with a clear purpose rather than simply using an inactive bulking agent.
The main consideration is the very high 10,000 IU (250μg) dose of Vitamin D3. For this reason, we see it as a more specialised high-strength option rather than automatically the best choice for everyday use. Higher dosage does not necessarily mean a supplement is better, and individual requirements can vary.
Important Information & Disclosure
Medical Disclaimer
The information provided on Core Longevity is for general educational and informational purposes only and should not be considered medical advice. Supplements are not intended to diagnose, treat, cure or prevent any disease. Always speak with a qualified healthcare professional before starting a new supplement, particularly if you are pregnant, breastfeeding, taking medication or have an existing medical condition.
Affiliate Disclosure
Some links on Core Longevity may, in the future, be affiliate links. This means that if you choose to purchase a product through one of these links, Core Longevity may earn a small commission at no additional cost to you. Our reviews and product selections are based on our independent assessment of Quality, Purity and Purpose, not simply on whether a company offers an affiliate programme.
We believe in being transparent with our readers and will always disclose affiliate relationships where they exist.