Natural Vitamin D3
Vitamin D3 naturally occurs almost exclusively in animal sources as the bioactive form of vitamin D. Plants, such as lichens and various fungi, contain only very small amounts of the much less effective form of vitamin D2. Lanolin, the wax found in sheep's wool, is a proven source for obtaining bioactive vitamin D3 (cholecalciferol). A multi-stage process, which includes gentle extraction and intensive purification, results in a highly pure crysallised D3 that is used as the active ingredient for our vegetarian Sunferol® D3 formulation.
All-trans Vitamin K2
Vitamin K2 exists in various molecular forms, which are referred to as MK-4 and MK-7 depending on the length of their side chains. MK-7 is considered the most effective form of vitamin K2, as it remains active in the body for an exceptionally long time and meets the functional K2 requirement even at low dosages. However, there are further variants within the MK-7 form. Only the trans form has full biological effectiveness. An active ingredient declared as "all-trans" must therefore consist of at least 98% vitamin K2 MK-7 in this effective trans form.
Special caution is required in the area of vitamin K2. Despite manufacturers' claims, widespread label fraud occurs here. Independent laboratory tests show that many supplements declared as "all-trans K2" often contain only small amounts of all-trans vitamin K2.
Our original Sunquinone® K2 is a premium branded active ingredient, delivering an exceptionally high MK7 all-trans content of approximately 99.8%. This consistently high degree of purity is verified through comprehensive independent laboratory testing.
Absolute Purity: No Hidden Additives
Our branded active ingredients Sunferol® D3 and Sunquinone® K2 are specially manufactured for Sunday Natural – made from natural raw materials and with particular emphasis on purity and quality. For optimal intake and maximum stability, we suspend our premium D3 in MCT coconut oil. Conventional vitamin D3 active ingredients are often mixed with a whole range of questionable additives, including synthetic vitamin E, ascorbyl palmitate, silicon dioxide, modified starch, sucrose, denatured vegetable oils and maltodextrin. However, our vitamin D3 is specially manufactured according to our specifications, thereby avoiding such hidden additives. The purity of this raw material means only a small amount of bioactive vitamin E needs to be added as an antioxidant to ensure optimal stability and shelf life. To maintain the excellent quality of our products, they are regularly tested in an independent laboratory for active ingredient content, freshness and possible contaminants such as heavy metals.
MCT Coconut Oil for Optimal Absorption & Protection
Vitamins D and K2 are fat-soluble vitamins that can only be absorbed by the body when combined with fats. For this reason, Sunday Natural's vitamin D3 + K2 uses high-quality MCT oil as a carrier oil. In contrast to other carrier oils (such as olive oil), pure MCT oil offers optimal protection for fat-soluble vitamins, thus ensuring maximum stability of the active ingredients. The medium-chain fatty acids in the carrier oil constitute valuable nutrients themselves. Our oil, which is processed in the Netherlands, is grown without the use of synthetic plant protection products.
In order to achieve an even distribution of vitamins D3 and K2 in the active ingredient powder and thus a precise dosage, only highly pure, 100% nanoparticle-free microcrystalline cellulose is used. Our vitamin D3 powder is also rich in high-quality MCT (coconut) oil for optimal absorption of fat-soluble vitamin D3. Natural vitamin E protects the active ingredients from oxidation, allowing for a prolonged shelf life.
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 amber glass.
