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Measure To Know Bundle (2 Blood Tests + Daily Essentials)

Sale price€132,00 Regular price€165,00
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We believe that measuring is knowing. That’s why we created this subscription bundle to help you understand your vitamin levels before and during your supplement journey.

This bundle includes 2 blood tests and 1 Starter Kit for a subscription, giving you the tools to track your progress.

We recommend taking your first blood test before you start. In collaboration with the independent lab mijnlabtest.nl, your vitamin B12 and vitamin D levels will be tested from the comfort of your own home.

Once you've done the test, you can start with the Daily Essentials. You will receive refills every 6 weeks. After some time, you decide when it’s right to take the second blood test to see how your levels have changed. We recommend at least 3 months.

Enjoy 15% off the tests, 30% off the Starter Kit with this bundle.
Note: With your purchase, you’re subscribing to the Daily Essentials (€44 per 6 weeks). Pause or cancel anytime.

Subscribe & save

  • Extra discount on subscription
  • Flexible edits or swaps anytime
  • Easy, no-cost cancellation
Why test Vitamin B12 and D?

These vitamins play a pivotal role in AM+PM - The Essentials, forming the cornerstone of your supplement regimen. As this is our first product launch, we are exclusively concentrating on blood tests measuring these vitamins. With future product launches, we will introduce accompanying blood tests.

A deficiency in Vitamin B12 can lead to symptoms such as fatigue, memory loss, or difficulty concentrating. Additionally, one in three individuals in the Netherlands has a Vitamin D deficiency. Optimal Vitamin D levels are crucial for the immune system, calcium absorption, and muscle function. Regular testing of your Vitamin B12 and D levels is, therefore, beneficial.

How it works

The Vitamin B12 & D Blood Test offered by THE CORE* is provided in partnership with Mijnlabtest.nl. Upon receiving your package, carefully read and follow the instructions. Take the test easily in the comfort of your home and return it free of charge. Securely receive your personalized results within 6 business days. This test allows you to self-collect the sample, eliminating the need to visit a collection center. The results are processed by an ISO 15189 certified European laboratory and validated by a biochemist. *THE CORE does not have access to your test results.

What do the sprays taste like

The sprays feature natural flavours. The AM Spray tastes like just water, while The PM Spray offers a natural lemon taste. Both are free from artificial flavourings and sugars, and the lemon is 95% derived from fruits.

Why subscribe

Our products are designed for long-term use to support a consistent vitamin level. To make it easy for you and more sustainable, we offer free delivery to your home every 6 weeks with an additional 20% discount. Plus, you'll receive a Health Plan worth €120 for free!

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Founded by Louise Lagendijk, to empower Women's health.

Louise Lagendijk, medical doctor and integrative medicine specialist, and founder of THE CORE, believes that integrative medicine is the future of healthcare and that prevention comes before intervention. Her mission is to empower people to take control of their health and live in balance with their body, mind and environment.
Measure To Know Bundle (2 Blood Tests + Daily Essentials)
Measure To Know Bundle (2 Blood Tests + Daily Essentials) Sale price€132,00 Regular price€165,00
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Frequently asked questions

Use the FAQ section to answer your customers' most frequent questions.

How does the blood test work?

The Vitamin B12 & D Blood Test offered by THE CORE* is provided in partnership with Mijnlabtest.nl. Upon receiving your package, carefully read and follow the instructions. Take the test easily in the comfort of your home and return it free of charge. Securely receive your personalized results within 6 business days. This test allows you to self-collect the sample, eliminating the need to visit a collection center. The results are processed by an ISO 15189 certified European laboratory and validated by a biochemist. The blood tests will be shipped directly to you by Mijnlabtest.nl in a mailbox-friendly package, so you don't need to stay at home to receive it. *THE CORE does not have access to your test results.

Why only test Vitamin B12 & D?

These vitamins play a pivotal role in AM+PM - The Essentials, forming the cornerstone of your supplement regimen. As this is our first product launch, we are exclusively concentrating on blood tests measuring these vitamins. With future product launches, we will introduce accompanying blood tests.

Why test your Vitamin B12 & D levels?

A deficiency in Vitamin B12 can lead to symptoms such as fatigue, memory loss, or difficulty concentrating. Additionally, one in three individuals in the Netherlands has a Vitamin D deficiency. Optimal Vitamin D levels are crucial for the immune system, calcium absorption, and muscle function. Regular testing of your Vitamin B12 and D levels is, therefore, beneficial.

Why are there 2 separate sprays?

We keep our sprays clean by separating water- and oil-soluble vitamins, avoiding the need for emulsifiers. The AM spray is water-soluble and packed with vitamins that help boost energy, improve mood, and reduce stress throughout the day. The PM spray, on the other hand, is oil-based and supports immunity and promotes brain health overnight.

Which ingredients are in the sprays?

Both the AM and the PM Spray contain carefully selected, high-quality ingredients tailored to your needs. The AM spray contains water soluble Folate, Vitamin B12, Iodine and Biotin. The PM spray contains fat soluble vitamins: vitamin D, vitamin K and MCT Oil. All our sprays are free from sugar and unnecessary additives, filler and binders.

10,000+ happy sprayers

Thousands of women have already made the switch to smarter, easier vitamins — and feel the difference every day.

9x faster absorption

Because every woman deserves vitamins that fit her lifestyle — not the other way around.

100% clean and traceable

Because every woman deserves vitamins that fit her livestyle — not the other way around.

10K+

Satisfied customers with 5 star reviews

9x

Up to 9x easier absorption

100%

Ingredient traceability with patented formulas

40%

Of adults struggle with pills, we make it effortless.

Drs. Louse Lagendijk
Meet the founder

Founded by Louise Lagendijk, The Core We Care is the result of her pursuit to empower women to take control of their health

Integrative medical doctor and former Harvard researcher dr. Louise Lagendijk founded The Core combining years of scientific research with a passion for preventive and integrative women's health. She founded The Core We Care to make smarter, cleaner, and more effective nutrition accessible to women and their families — without the pills, pressure, or complexity.

Step 01

Subscribe and save 20%

Keep both your Starter Kit and Refills in your cart.

Your 12-week Health Plan - A comprehensive digital document (75+ pages) with health tips, meal plans, recipes, workouts, and integrative medicine insights. Weekly email guidance included.
Step 02

Download your Health Plan

Take the quiz and receive personalized weekly emails for 12 weeks.

Step 03

Use daily for 6 weeks

3 Sprays under the tongue for both the AM and PM.

Step 04

Refill

After 6 weeks your refills will automatically land on your doormat.