Frames D3+K2 Strips

D3 helps your body absorb more calcium from food. But D3 doesn’t tell it where to go—that’s up to K2. Without K2, calcium can end up in places you don’t want it (blood vessels, soft tissues) instead of where it belongs (bones and teeth). D3 alone is only half the job. D3 with K2 is the complete solution.

It sounds like a lot, but it isn’t. The official RDA of 100% (10 mcg) is the absolute minimum to prevent a deficiency, not the optimal dose. Modern research indicates that serum levels cannot be achieved with 10 mcg. 50 mcg is well within the upper safe intake limit (100 mcg/day for adults according to EFSA). Vitamin D3 is stored, so your body takes what it needs.

MK-4 is synthetic and lasts 6–8 hours. MK-7 is natural (derived from Japanese natto fermentation) and lasts 24–72 hours. We choose MK-7 because one strip a day actually lasts a full day—no need to take it three times a day. Most budget supplements use MK-4 because it’s cheaper.

Morning is best. D3 can have a mildly stimulating effect on some people, which isn’t what you want in the evening. It doesn’t matter whether you take it with or without food; sublingual absorption works regardless of what you’ve eaten.

Consult your doctor first. K2 affects blood clotting, so if you’re taking a blood thinner (such as warfarin or acenocoumarol), your dosage and monitoring need to be adjusted. This isn’t a problem for most people, but it is for those taking certain medications.

In the Netherlands, the sun is too low in the sky from October through March to allow your skin to produce enough vitamin D3—so supplementation is essential during that time. But this also applies in the summer: if you spend a lot of time indoors, use sunscreen, or are mainly outdoors in the evening, your body produces limited amounts of vitamin D3. For most people, taking it daily year-round makes more sense than taking it seasonally.

This product is vegetarian. It contains no gelatin, no sugar, and no artificial colors.