Vitamins D and K and calcium metabolism
Nutrition reviews describe vitamin D3 and K2 as synergistic partners — D3 increases calcium absorption while K2 activates proteins that direct calcium deposition to bone and away from vasculature.
About this product
Support your wellness routine with Monthlees CardioCal Strips, a convenient and easy-to-take oral supplement formulated with Vitamin D3 and Vitamin K2. These essential nutrients play complementary roles in helping to maintain normal calcium absorption and supporting the body’s natural bone health processes.
Vitamin D3 and Vitamin K2 work together to support the body’s natural calcium utilization and bone maintenance functions. These essential nutrients play complementary roles in helping to maintain healthy calcium metabolism and contribute to the support of strong bones and teeth.*
Suggested use
About monthlees
The supplement industry is built on inflated pricing, confusing labels, and aggressive marketing.
Monthlees exists to fix that.
We believe:
- Supplements should be clinically dosed
- Pricing should be transparent
- Testing should be independent
- And customers shouldn't pay for influencer commissions or retail margins
Instead of hiding costs inside the product price, we use a simple membership model — so you pay what supplements actually cost to make.
Shipping & returns
• Shipping: Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days depending on your location.
• Returns: You may return or exchange products within 30 days of receiving your order. Items must be in original condition with proof of purchase.
If your item is defective or damaged due to manufacturing issues, we’ll gladly replace it at no additional cost.
30 Day Money Back Guarantee
FDA Disclaimer
What's in CardioCal™ Strips?
- 2,000 IU vitamin D3 (250% DV)
- 120 mcg vitamin K2 (100% DV)
- Fast-dissolving oral strip (100 mg)
- Raspberry flavor · stevia sweetened
- 1 strip · 30 servings
- No water required
Supplement Facts
CardioCal™ Strips
Supplement Facts
Serving Size 1 Oral Strip (100 mg)
Servings Per Container 30
Amount Per Serving
% DV
Vitamin D3 (Cholecalciferol)
2000 IU
250%
Vitamin K2 (Menaquinone)
120 mcg
100%
Other Ingredients: Pullulan, cellulose, erythritol, pectin, raspberry flavor, malic acid, lecithin, sorbitol syrup, steviol glycosides.
Free of
- D3 without K2
- Bulky calcium tablets
- Water-required formats
Diet friendly
- D3 + K2 paired on label
- 2,000 IU + 120 mcg disclosed
- Fast-dissolving strip
- Raspberry · stevia sweetened
Bone support — made effortless.
-
Calcium absorption
2,000 IU vitamin D3 supports normal calcium absorption and helps maintain healthy serum calcium levels — disclosed at 250% DV per strip.*
-
Smart calcium use
120 mcg vitamin K2 (menaquinone) helps direct calcium toward bones while supporting vascular balance — paired with D3 on every label.*
-
Bone & teeth support
Coordinated D3 + K2 supports healthy calcium metabolism and contributes to the maintenance of strong bones and teeth as part of daily wellness.*
-
Portable delivery
Fast-dissolving raspberry strip — no water, no swallowing, no cooler bag. Keep strips in a purse, desk drawer, or travel kit.*
How it works
-
Step 1: Dissolve
Place one strip on your tongue — it dissolves in seconds without water. Portable D3 + K2 support for mornings, travel, or on-the-go routines.
-
Step 2: Absorb
Vitamin D3 (2,000 IU) supports intestinal calcium absorption and helps maintain normal serum calcium levels — as listed on the supplement facts panel.
-
Step 3: Direct
Vitamin K2 (120 mcg menaquinone) activates proteins that help direct calcium toward bones and away from soft tissues — the pairing D3-only products often miss.*
Supplement facts
D3 + K2 synergy — bone and calcium support in a fast strip.
Vitamin D3 (Cholecalciferol)
—
2000 IU
250%
** Percent Daily Values are based on a 2,000 calorie diet.
Vitamin K2 (Menaquinone)
—
120 mcg
100%
Consult your provider if taking anticoagulant medications. ** Percent Daily Values are based on a 2,000 calorie diet.
Evidence-based ingredients
The science behind the ingredients
CardioCal Strips disclose 2,000 IU vitamin D3 and 120 mcg vitamin K2 on every label — not a mystery vitamin stack. Explore the research on calcium metabolism, bone health, and oral strip delivery.*
2,000 IU
Vitamin D3
120 mcg
Vitamin K2
30
Strips per box
Menaquinone and cardiovascular health
Reviews of menaquinone supplementation discuss its role in activating matrix Gla-protein — supporting arterial elasticity and cardiovascular integrity as part of calcium metabolism.
Vitamin D and bone mineral density
Controlled trials report that vitamin D3 supplementation supports calcium absorption and bone mineral density in adults with suboptimal vitamin D status.
Oral dissolving strip delivery
Pharmaceutical reviews describe oral dissolving film technology as enabling rapid buccal absorption and convenient dosing — supporting strip-format vitamin delivery.
Compare D3 + K2 strip formats
How Monthlees CardioCal Strips stacks up
Many D3 products skip K2 entirely — leaving calcium direction unaddressed. CardioCal Strips pair 2,000 IU D3 and 120 mcg K2 in a fast-dissolving raspberry strip with every dose on the label.
Typical D3 supplement |
||
|---|---|---|
|
Vitamin K2 included
|
120 mcg on label
|
Often omitted
|
|
Vitamin D3 dose
|
2,000 IU (250% DV)
|
Often 25–50 mcg
|
|
No water required
|
Fast-dissolving strip
|
Capsule or softgel
|
|
Member pricing available
|
Yes — Monthlees members
|
No
|
Insider access to the world's best labs & supplement manufacturers.
Membership allows us to sell products for a fraction of the typical industry retail price. Think of it as an insider access pass to the warehouses of the supplement industry.
Monthlees members don't pay for:
- Middlemen
- Marketing & influencer costs
- Retailer markups
- Distributor margins
Stop overpaying for incomplete D3 stacks.
Buying separate D3 and K2 bottles often costs $35–$60/month with inconsistent dosing. CardioCal Strips and Monthlees membership keep coordinated bone and cardiovascular support affordable.
| Treatment | Other guys | Monthlees |
|---|---|---|
| CardioCal Strips monthly supply 30 strips — 1 strip daily | $50.00 | $20.77 |
| Separate D3 + K2 bottles Retail-priced vitamin stack | $35–$60/mo | One strip, both actives |
| D3 without K2 Incomplete calcium pairing | Missing K2 | 120 mcg on label |
Start your monthlees health journey with complete support
Your membership gives you access to better pricing, personalized guidance, and everything you need to build a healthy supplement & personal care routine that effortlessly fits your life.
- Unlock member pricing of 50-80% off on every product
- Get your personalized Starter Routine Kit
- Use flexible subscriptions to save on repeat orders
- Manage everything easily from your Monthlees account
- 30-day money back guarantee on all product purchases
- Automatic savings applied at checkout
- 100% flexible. Update, pause, or cancel anytime
Member trust
Confidence built into every order
From clear member pricing to flexible subscriptions and responsible product standards, Monthlees is built to help you shop with confidence — without inflated markups, hidden tiers, or checkout surprises.
-
Transparent product pricing
Every product shows clear pricing for guests and members, so you can compare your savings before you buy.
-
Member savings applied automatically
When you’re signed in as a member, your eligible discounts are applied automatically at checkout.
-
Subscriptions that stay flexible. Cancel anytime.
Start, pause, skip, or adjust product subscriptions from your account — without hidden hoops or confusing rules.
Frequently asked questions
Everything you need to know about Monthlees member pricing, subscriptions, and how checkout works.
Why pair vitamin D3 with vitamin K2?
Vitamin D3 increases calcium absorption, while vitamin K2 activates proteins that help direct calcium to bones and away from soft tissues. CardioCal Strips deliver 2,000 IU D3 and 120 mcg K2 (menaquinone) per strip — the coordinated pairing recommended for intelligent calcium metabolism.
How are CardioCal Strips different from CardioCal™ capsules?
They are separate SKUs with different supplement facts panels. CardioCal™ capsules deliver calcium, D3, K2 MK-7, and BioPerine® in a veggie capsule (60 servings). CardioCal Strips deliver 2,000 IU D3 and 120 mcg K2 in a fast-dissolving oral strip (30 servings) — no calcium or BioPerine®. Choose strips for portable D3 + K2 convenience; choose capsules for the full calcium-inclusive formula.
Can I take CardioCal Strips with blood thinners?
Consult your healthcare provider before use if you take warfarin or other anticoagulant medications. Vitamin K2 can interact with blood-thinning drugs by affecting vitamin K-dependent clotting factors.
Why I created monthlees...
When I was 19 years old, I was diagnosed with a brain tumor. That experience forced me to start asking deeper questions about how the human body actually works.
Over the next 18 months, I immersed myself in studying health, nutrition, and neuroscience — eventually earning my degree in Neuroscience from Duke University. Along the way, I discovered something powerful: the body is incredibly resilient & inherently self-healing when it’s given the right support.
Strategic nutrition and supplementation became a major part of my own health journey. And over the last two decades, I’ve devoted my life to helping millions of people around the world take a more proactive role in their health.
That experience completely changed how I thought about health — and ultimately shaped the way Monthlees was built.
I created Monthlees because I was tired of seeing people pay premium prices for supplements that were under-dosed, over-marketed, and difficult to trust.
My goal is simple: build the kind of brand I would want for myself and my family — with better ingredients, transparent formulas, meaningful dosages, and a business model built on long-term trust.
— Chris Walker, Founder of Monthlees
