Seeking Health Vitamin D3 + K2 (60 CAPS)
$38.50
Vitamin D and K2 supplement: 5,000 IU vitamin D3 (cholecalciferol) with 100 mcg vitamin K2 as vitaMK7® (MK-7 form).
Seeking Health capsule formulation using the long-acting MK-7 form of K2.
In stock
Ships same business day from Melbourne (orders before 2pm)
What is Seeking Health Vitamin D3 + K2 and who is it for?
Seeking Health Vitamin D3 + K2 is a high-potency combination supplement providing 5,000 IU of vitamin D3 alongside 100 mcg of vitamin K2 as vitaMK7® in a single small capsule. It’s designed for adults and children aged 4 and up who want to maintain adequate vitamin D levels, particularly those with limited sun exposure, darker skin tones, indoor-focused lifestyles, or those over 50 where vitamin D status becomes increasingly relevant.
The reason D3 and K2 are paired together comes down to how these two nutrients work in the body. Vitamin D3 is involved in calcium absorption from the gut, while vitamin K2 plays a role in directing where that calcium ends up in the body. Using the MK-7 form of K2 (rather than MK-4) means it remains active for significantly longer, making once-daily dosing practical. This is a well-established combination that practitioners commonly recommend as part of foundational nutrition support.
Fairfield Nutrition Thoughts
Vitamin D insufficiency is genuinely common in Australia, particularly among people who work indoors, use sunscreen consistently, have darker skin, or are over 50. Despite the sunny climate, many Australians don’t reach adequate levels through sun exposure alone. The pairing with K2 as MK-7 reflects a sensible formulation choice: vitamin D3 increases calcium absorption, and K2 helps the calcium be directed toward bone tissue rather than soft tissue.
Why This Formulation / How It Works
Most vitamin D supplements on the market either use D3 alone or pair it with the shorter-acting MK-4 form of K2. This formulation uses vitaMK7®, a patented MK-7 form that remains active in the body for approximately 72 hours compared to the 1-2 hours of MK-4. That extended activity means once-daily dosing is genuinely sufficient, and you’re not relying on precise timing to maintain consistent levels. The 5,000 IU dose is meaningfully higher than many standard supplements, which is relevant given how common vitamin D insufficiency is in people with limited sun exposure.
The capsule is small, free from common allergens, and suitable for a wide range of people including those who are pregnant, breastfeeding, methyl-sensitive, or following a vegetarian diet. Capsule contents can also be opened and mixed with food for children who can’t yet swallow capsules.
Role of Vitamin D3 in Calcium Metabolism
Vitamin D3 (cholecalciferol) is converted in the liver and kidneys to its active hormonal form, calcitriol. Calcitriol acts on the intestinal lining to increase calcium absorption from food and plays a role in calcium reabsorption in the kidneys. Vitamin D receptors are found in most tissues in the body, including immune cells, which reflects the breadth of physiological processes this nutrient is involved in.
Role of Vitamin K2 (MK-7) in Calcium Direction
Vitamin K2 activates proteins involved in calcium regulation, most notably osteocalcin (which anchors calcium into bone matrix) and matrix Gla-protein (which is found in vascular tissue). The MK-7 form is fat-soluble and has a longer half-life than MK-4, making it more suitable for once-daily supplementation. The vitaMK7® trademark reflects a specific fermentation-derived form with documented stability and bioavailability data.
When to Consider This
This supplement makes sense if you’re:
- Someone with limited sun exposure due to indoor work, consistent sunscreen use, or living at higher latitudes where UV levels are lower in winter months.
- Over 50, as the skin’s ability to synthesise vitamin D from sunlight decreases with age.
- Someone with darker skin, which requires more sun exposure to produce equivalent vitamin D levels compared to lighter skin tones.
- Someone whose blood testing has identified low or borderline vitamin D levels and whose healthcare provider has recommended supplementation.
- A parent looking to support bone and immune wellness in children aged 4 and up, particularly during growth phases or winter months.
Supplement strategy: This is a foundational supplement that fits well alongside other daily essentials such as omega-3s and magnesium. Dr. Ben Lynch recommends pairing it with magnesium, as magnesium is involved in vitamin D metabolism. Periodic vitamin D blood testing is worth doing to ensure levels remain in a sensible range, particularly at this dose.
⚠️ Not suitable for: Children under 4 years old. Pregnant or breastfeeding individuals should check whether their prenatal supplement already provides adequate D3 and K2 before adding this product. Do not use if taking warfarin or other anticoagulant medications without medical supervision.
How to Use
The suggested use is 1 capsule with food, any time of day or night, or as directed by your healthcare professional. Each capsule provides 5,000 IU of vitamin D3 and 100 mcg of vitamin K2 as MK-7.
For children aged 4-8: the safe upper intake level for this age group is 3,000 IU daily, so every other day dosing (rather than daily) keeps intake within that range. For children aged 9 and up, the upper intake level is 4,000 IU daily, so the same every-other-day approach applies. If a child can’t swallow the capsule, the contents can be opened and mixed into a small amount of food.
Seeking Health notes that magnesium is involved in vitamin D metabolism. If you’re not already getting magnesium through diet or another supplement, it’s worth considering alongside this product.
Ingredients
Per 1 capsule:
Vitamin D3 (as cholecalciferol) — 5,000 IU (125 mcg)
Vitamin K2 (as vitaMK7®, menaquinone-7) — 100 mcg
vitaMK7® is a registered trademark of Gnosis S.p.A.
Other ingredients: Hydroxypropyl methylcellulose (capsule shell), microcrystalline cellulose, medium chain triglycerides.
Allergen information: Free from common allergens. Suitable for vegetarians.
Common Questions
Why does this include K2, not just vitamin D3?
Vitamin D3 increases calcium absorption from the gut, and K2 plays a role in where that calcium ends up in the body. The two nutrients are commonly paired in practitioner formulations for this reason. Using K2 without D3 (or vice versa) means you’re missing part of the picture.
Why MK-7 rather than MK-4?
MK-7 stays active in the body for around 72 hours, while MK-4 is cleared in 1-2 hours. For once-daily supplementation, MK-7 provides more consistent coverage. The vitaMK7® form used here is a well-researched, fermentation-derived MK-7 with documented stability.
Is 5,000 IU too high for daily use?
For most adults, 5,000 IU daily is a common therapeutic dose, particularly for those with limited sun exposure or low baseline levels. That said, vitamin D is fat-soluble and accumulates, so periodic blood testing is sensible to keep levels in an appropriate range. Your healthcare provider can advise on what’s right for your situation.
Can I take this if I’m pregnant or breastfeeding?
Seeking Health’s own prenatal supplements already include 4,000 IU of D3 and 100 mcg of K2 per serving, so additional supplementation may not be necessary. Check your prenatal formula first, and discuss with your healthcare provider before adding more.
Can I take this if I’m on blood thinners?
Vitamin K2 affects clotting pathways, which can interact with warfarin and similar anticoagulant medications. If you’re taking any anticoagulant, speak with your prescribing doctor before using this product.
Warnings & Storage
Do not use if: Inner tamper seal is damaged. Do not use if taking warfarin or anticoagulant medications without medical supervision.
Cautions: At 5,000 IU per capsule, periodic monitoring of vitamin D blood levels is recommended. High vitamin D levels can contribute to elevated blood calcium; if your levels test high, ask your doctor to check blood calcium as well. Children aged 4-8 should not take this daily at full dose (see dosing guidance above). Seek medical advice before use during pregnancy or breastfeeding if already taking a prenatal supplement containing D3 and K2.
Storage: Store in a cool, dry place, away from direct sunlight, and out of reach of children.
Always consult your healthcare professional before use if you have any pre-existing conditions or are taking medications.
| Weight | 0.034 kg |
|---|---|
| Dimensions | 5.2 × 5.2 × 8.2 cm |
