Vitamin D3 + K2 (MK-7) Blend

Thovek supplies vitamin D3 and vitamin K2 as a matched pair rather than as two separate line items. The D3 is cholecalciferol (CAS 67-97-0, C27H44O, MW 384.64), for which 1 mg carries 40,000 IU of vitamin D activity; the K2 is menaquinone-7 (CAS 2124-57-4, C46H64O2, MW 649.0), the long-chain menaquinone found in natto. Only the all-trans isomer of MK-7 is biologically meaningful — the cis isomer has been measured at roughly 1 per cent of the trans form's activity — so we specify all-trans content, not simply total MK-7, on every batch. Two build routes are available. For drops, crystalline cholecalciferol and an MK-7 oil dispersion (typically 0.2 or 1.3 per cent on MCT or sunflower oil) are blended into a food-grade carrier oil and dosed per drop. For capsules, tablets, sachets and fortified powders, we use cold-water-dispersible D3 (commonly 100,000 IU/g) with a microencapsulated MK-7 powder. Origin has to be declared and it is not cosmetic detail: D3 is normally derived from lanolin, which is ovine and therefore vegetarian but not vegan, unless you specify lichen-derived D3; MK-7 is either fermented by Bacillus subtilis natto or made synthetically, and soy-substrate fermentation makes the material a soy allergen risk that chickpea-substrate and synthetic grades avoid. Both forms are established in supplement law. Cholecalciferol, and menaquinone occurring principally as menaquinone-7, appear in Annex II of Directive 2002/46/EC, and vitamin K2 (menaquinone) from B. subtilis natto was authorised as a novel food ingredient by Commission Decision 2009/345/EC. For label arithmetic, the EU nutrient reference values in Annex XIII of Regulation (EU) No 1169/2011 are 5 µg for vitamin D and 75 µg for vitamin K, and EFSA's tolerable upper intake level for vitamin D in adults is 100 µg (4,000 IU) per day. Thovek supplies composition and analytical data only; take claim wording from the EU Register of authorised claims or your market's equivalent.