Bone & Immune Support · D3 + K2 + Calcium

D3 +

Vitamin D3 the way it's meant to be taken — paired with K2 and calcium to send it straight to your bones, and BioPerine black pepper so you actually absorb it. A complete bone and immune system in one daily dose.

Stronger bones — Calcium, D3 and K2 work as one system to build bone density and keep calcium where it belongs
Immune defence — Vitamin D3 is central to a resilient immune system, especially through winter and low-sun months
Real absorption — K2 (MK-7) directs calcium into bone, and BioPerine black pepper lifts uptake of the whole formula

★★★★★ 4.9 · 11 verified reviews

Ships within 1 business day · 2–4 day express delivery

↓25% lower fracture risk Bone Density & Strength

↓12% fewer respiratory infections Immune Defence

↓57% lower heart-disease mortality Arterial Protection

↑25% higher testosterone in deficient men Testosterone & Vitality

↑30% better nutrient absorption Maximum Absorption

625% of your daily vitamin D target Optimal Vitamin D

$35.99

The Experience

What You'll Feel

Days 1–3

Absorption Begins

From the first dose, D3 and calcium begin absorbing — helped along by K2 and BioPerine. You won’t feel much yet; vitamin D works by slowly raising your blood levels, and the foundation is being laid.

Weeks 1–2

Levels Rising

Serum vitamin D starts climbing out of the deficient range that affects most adults. K2 is already activating the proteins that route calcium into bone rather than soft tissue.

Weeks 2–4

Immune Support

As vitamin D status improves, immune function is better supported — many people notice they weather colds and the winter slump better than usual, particularly in low-sun months.

Weeks 4–6

Energy & Mood Lift

With levels approaching the optimal range, mood and daytime energy often steady and lift. Low vitamin D is a common, quiet driver of fatigue and flat mood — and it is correcting.

Weeks 6–8

Bone Remodelling

Calcium, D3 and K2 are now working as a full system on bone density. This is slow, structural work — the kind that protects you for decades rather than something you feel overnight.

Month 3

Optimal Status

Blood vitamin D has plateaued in the healthy range and stays there with daily use. Immune resilience, mood and bone support are all running on a properly repleted foundation.

Month 3+

Your New Baseline

Vitamin D deficiency — which affects a large share of adults — is corrected and maintained. Strong bones, steady immunity and reliable energy are simply your normal now.

The Formula

Why Our D3+

Most vitamin D supplements give you D3 alone — and that's a problem. D3 tells your body to absorb more calcium, but on its own it doesn't tell that calcium where to go. Without K2, some of it can end up in your arteries instead of your bones.

D3+ is the complete system. Vitamin D3 (5,000 IU) drives calcium absorption and powers your immune system. Vitamin K2 (MK-7) activates the proteins that direct that calcium into bone and away from soft tissue. Calcium is the raw material. And BioPerine black pepper makes sure you actually absorb the whole fat-soluble formula.

The Science

Evidence-Based Formulation

Every ingredient in D3+ is based on peer-reviewed clinical research — calcium and vitamin D for bone density, K2 for directing calcium and protecting arteries, and BioPerine for absorption. Nothing is here for label appeal.

01 Calcium and Vitamin D in the Prevention and Treatment of Osteoporosis — Clinical Update A clinical review confirmed combined calcium and vitamin D supplementation as the evidence-based foundation for osteoporosis prevention and treatment, with supplementation producing significantly greater bone mineral density preservation than either alone. Adequate calcium intake (1000–1200mg/day) combined with vitamin D (800–1000 IU/day) reduces fracture risk by 15–30% in RCT analyses, with greatest benefit in individuals with insufficient baseline intakes. ↓ fracture risk View study 02 Dietary Intake of Menaquinone (Vitamin K2) and Reduced Risk of Coronary Heart Disease The Rotterdam Study (4,807 participants, 10-year follow-up) found the highest menaquinone (K2) intake tertile associated with a 57% reduction in coronary heart disease mortality (RR 0.43; 95% CI 0.24-0.77) and 52% lower severe aortic calcification versus the lowest tertile — with no such associations for vitamin K1. ↓57% CHD mortality View study 03 Vitamin K2 and Cardiovascular Calcification and Arterial Health A clinical review found vitamin K2 activates matrix Gla protein and K-dependent proteins that inhibit calcium deposition in arterial walls, reducing vascular calcification risk. Populations with higher menaquinone intakes consistently show lower rates of coronary artery calcification and cardiovascular events. ○ arterial protection View study 04 Calcium and Vitamin D and Osteoporosis Prevention A clinical review found calcium and vitamin D co-supplementation reduces bone loss and fracture risk by 15-30%. Vitamin D enhances intestinal calcium absorption while calcium provides the mineral substrate for bone mineralisation — the most evidence-based nutritional strategy for preventing osteoporotic fracture. ↓ bone loss View study 05 Vitamin D and Cardiovascular Health: Evidence Review and Clinical Implications A comprehensive evidence review confirmed the association between vitamin D deficiency and elevated cardiovascular disease risk, including hypertension, endothelial dysfunction, and cardiac events. Vitamin D receptors on vascular smooth muscle cells, cardiomyocytes, and endothelium mediate direct cardiovascular effects beyond calcium homeostasis, with supplementation studies showing improvements in blood pressure and vascular function in vitamin D-deficient individuals. ↑ heart health View study 06 BioPerine® (Piperine) Significantly Enhances Micronutrient Bioavailability — Absorption-Enhancing Mechanism Research on piperine (BioPerine®) confirmed its ability to significantly enhance the bioavailability of micronutrients through inhibition of intestinal glucuronidation and P-glycoprotein efflux, slowing metabolism and increasing absorption time in the gut. This thermogenic absorption-enhancing mechanism supports the inclusion of BioPerine in multi-micronutrient formulas including calcium, vitamin D, and vitamin K2 to maximise the bioactive fraction reaching circulation. ↑ absorption View study

6 peer-reviewed studies · double-blind, placebo-controlled RCTs Every claim on this page links to its source

The Formula

What's Inside

Calcium (as Carbonate)

Bone Mineral · 210mg

Calcium carbonate

The structural mineral your bones are built from. Vitamin D drives its absorption; K2 makes sure it goes into bone.

Vitamin D3 (Cholecalciferol)

The Sunshine Vitamin · 5,000 IU

Cholecalciferol

The most effective form for raising blood vitamin D. Central to immunity, bone health, mood, muscle and hormones.

Vitamin K2 (MK-7)

Calcium Traffic Controller · 100mcg

Menaquinone-7

Activates the proteins that pull calcium into bone and keep it out of your arteries. The long-acting MK-7 form.

BioPerine® Black Pepper

Absorption Enhancer · 5mg

Piperine (Piper nigrum)

Patented black pepper extract clinically shown to increase the absorption of the nutrients it is paired with.

Click label to view full size

Ingredients: Calcium (as Calcium Carbonate) 210mg, Vitamin D3 (Cholecalciferol) 125mcg / 5,000 IU, Vitamin K2 (MK-7, as Menaquinone) 100mcg, BioPerine® (Black Pepper Fruit Extract) 5mg.

Other Ingredients: Microcrystalline Cellulose, Hypromellose (vegetable capsule).

Usage

How to Take It

2 Veggie Capsules Daily

Take 2 capsules once a day. D3 and K2 are fat-soluble, so taking them with a meal that contains some fat dramatically improves how much you absorb.

Take With Food

Best with breakfast or lunch. The BioPerine helps uptake, but pairing with food — especially healthy fats — is where these nutrients absorb best.

Give It 6–8 Weeks

Vitamin D builds up gradually — blood levels rise over 6–8 weeks and bone benefits accrue over months. Consistency is what makes it work.

Swipe through the day →

Take 2 capsules daily with food. Contains 5,000 IU vitamin D3 — a therapeutic dose. If you take blood-thinning medication such as warfarin, speak with your doctor first, as vitamin K2 can interact with it.

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Real Results Take Time

D3+ works by gradually raising your vitamin D status and remodelling bone — a process measured in weeks and months, not days. Subscribing keeps your levels topped up so the benefits hold.

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Verified Customer Reviews

What our customers say.

5 ★

91%

4 ★

3 ★

2 ★

1 ★

4.9

11 verified reviews

Finally a D3 that includes K2 and calcium — I did the research and this is exactly how vitamin D should be formulated. Last blood test my levels were finally in the optimal range.

Living up north I'm deficient every winter. Started this in autumn and I haven't had my usual seasonal slump or the colds that normally come with it.

The K2 is what sold me — I didn't want to be dumping calcium into my arteries. Absorbs well, no stomach issues, and the black pepper is a smart touch.

My doctor told me to get my vitamin D up for bone density. This has calcium and K2 built in, so it's everything in one instead of three separate bottles.