Heart Stress

with vitamin E, B6, magnesium

Our functional blend to support heart health with vitamin B1 thiamine, developed in close cooperation with Christian W. Engelbert, specialist in general medicine. The complex includes 16 selected nutrients, coenzyme Q10 as ubiquinone, as well as valuable secondary plant substances and extracts, such as rhodiola rosea, birch leaf, curcuma, ginko bilboa, dandelion root and green oats. Vegan. 120 capsules
  • Premium complex blend with 16 selected vitamins, minerals, and trace elements, coenzyme Q10, and valuable secondary plant compounds and extracts
  • Developed in collaboration with Christian W. Engelbert, a specialist in general medicine and author of the book "Heart Balance: How to Support and Strengthen your Heart and find your Inner Balance"
  • Contains thiamin (vitamin B1) to support normal heart function
  • Includes vitamin B6 and magnesium for normal functioning of the nervous system, normal psychological function, and energy metabolism
  • Contains zinc, copper, and manganese to protect cells from oxidative stress
  • Wide range of proven plant compounds and extracts, such as rhodiola rosea, lemon balm, turmeric, ginkgo biloba and oats
  • Enclosed in highly pure HPMC capsules for easy dosage
  • Recommended intake: Take 2-3 capsules twice daily with 200ml of water during a meal.
120 capsules

Delivery : 1-3 business days

Incl. VAT, excl. Shipping

€224.51 / 1kg
In stock

Premium Bioactive Ingredients

  • Uniquely broad blend of valuable active plant compounds and extracts
  • Original premium Rhodiola rosea extract with 3% rosavines and 1% salidrosides in the optimal ratio of 3:1
  • Sourced from wild collection in the Siberian Altai Mountains
  • Curcuma extract with full-spectrum curcuma matrix achieved through a special triple extraction process
  • Full synergy of high-dose curcuminoids, valuable essential oils, and over 200 valuable compounds from the curcuma root in patented PNS technology
  • 45:1 premium extract from ginkgo biloba, rich in ginkgolides, obtained through gentle water-ethanol extraction
  • Premium dandelion root extract with a highly pure 10:1 extraction process using water only
  • Green oat extract from whole seeds in a highly pure 10:1 extraction using water and ethanol only
  • Birch leaf extract obtained through pure water extraction, lemon balm extract, and powdered lavender essential oil
  • L-carnitine in its nature-identical, bioactive form L-carnitine tartrate
  • Coenzyme Q10 as ubiquinone, the bioidentical, oxidised form
  • Vitamin B6 in its direct bioactive coenzyme form P5P (pyridoxal-5-phosphate)
  • Trace elements as amino acid chelates: zinc as zinc lysinate and copper as copper bisglycinate with particularly high bioavailability
  • Manganese as manganese gluconate
  • Two organic magnesium compounds: magnesium taurate and magnesium glycinate

How are we different?

Our Heart Stress functional blend is carefully developed to support normal heart function and protect cells from oxidative stress. It consists of 16 specially selected vitamins, minerals, trace elements, antioxidants, and plant compounds. The blend was co-developed with Christian W. Engelbert, a general practitioner and author of the book "Heart Balance: How to Support and Strengthen Your Heart and Find Your Inner Balance."

This premium complex contains a wide range of carefully chosen valuable plant compounds and extracts, including rhodiola rosea extract with 3% rosavines and 1% salidrosides, lemon balm extract, curcuma extract with full-spectrum curcuma matrix, ginkgo biloba extract with ginkgolides, green oat and birch leaf extracts, dandelion root extract, and valuable powdered lavender essential oil.

In addition, the premium blend includes essential selected nutrients: vitamin B1 as thiamine hydrochloride in high-purity quality, vitamin B6 in its direct bioactive coenzyme form P-5-P (pyridoxal-5-phosphate), magnesium as a combination of the two organic magnesium forms magnesium taurate and magnesium glycinate, zinc and copper bound to amino acids as high-quality zinc lysinate and copper bisglycinate for optimal bioavailability, and manganese as manganese gluconate. This complex is complemented by coenzyme Q10 as ubiquinone, the oxidized form that can also be produced by the body, and L-carnitine as nature-identical, bioactive L-carnitine tartrate.

For the capsule shells we use custom-made HPMC capsules that, unlike most other HPMC and pullulan capsules on the market, are 100% free from controversial additives such as carrageenans and PEG. We then package this product in environmentally friendly amber glass.


  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners


Daily Requirement

Take 2-3 capsules daily with 200ml water at mealtimes.

Food Supplement

Do not exceed recommended dose. Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle. Keep out of the reach of children. Store in a cool, dark and dry place.


Store in a cool, dry place away from direct sunlight.


Magnesiumtaurate, Magnesiumglycinate, L-Carnitine tartrate, Birch leaf extract, Rhodiola rosea powder (Rhodiola rosea extract, bulking agent: gum arabic), Coenzyme Q10, Lemon balm extract, Curcuma extract, Ginkgo biloba extract, Green oat extract, Dandelion root extract, Lavender oil powder (Inulin, Lavender oil), Zinc lysinate, Manganese gluconate, Pyridoxal-5'-phosphate monohydrate, Thiamine hydrochloride, Copper bisglycinate.
Capsule shell: Hydroxypropyl methylcellulose,
Contents: 120 capsules

Ingredients per 4 capsules / 6 capsules % NRV**
Magnesium 200mg / 300mg 53 / 80
Zinc 1.7mg / 2.5mg 17 / 25
Manganese 0.33mg / 0.5mg 17 / 25
Copper 0.13mg / 0.25mg 17 / 25
Vitamin B6 0.9mg / 1.4mg 67 / 100
Thiamine 0.7mg / 1.1mg 67 / 100
L-Carnitine 333mg / 500mg ***
Birch Leaf Extract 267mg / 400mg ***
Rhodiola rosea Extract  133mg / 200mg ***
 of which rosavines 4mg /6mg ***
 of which salidrosides 1mg / 2mg ***
Coenzyme Q10  133mg / 200mg ***
Lemon Balm Extract  80mg / 120mg ***
 of which rosmarinic acid 5.6mg / 8.4mg ***
Curcuma Extract 80mg / 120mg ***
 of which curcuminoids 36mg / 54mg ***
Ginkgo Biloba Extract 67mg / 100mg ***
 of which flavonoids 16mg / 24mg ***
 of which ginkgolides 4mg / 6mg ***
Green Oat Extract 67mg / 100mg ***
Dandelion Root Extract 33mg / 50mg ***
Lavender Oil 1.7mg / 2.5mg ***

** Nutrient Reference Value
*** no NRV established

Product Details

Production In-house production in Europe, packaging in the EU according to HACCP, GMP and ISO 22000:2018 standards
Finished products packaged in environmentally friendly, compostable pouches and stored in non-toxic containers
Shipping in mineral oil-free boxes
Capsules Plant-based cellulose (HPMC). Vegan
Premium HPMC quality: Free from controversial additives such as carrageenans and PEG
Packaging Amber glass jar to protect against light and oxidation (free from plasticisers and BPA).
Environmentally-friendly packaging: 100% biodegradable and compostable (starch, cellulose and paper).
To Reuse Remove product label by soaking the jar in warm water for 5 minutes. Glue residue can be removed with dish soap

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

Learn more.

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