In my search, I found this promotional article for a K supplement, which discusses a little about the different kinds of K2, and says that Life Extension Super K, not Elite, had the bad form of MK7.

It was revealed that people with proper intake of vitamin K2 had a 57% lower chance of dying from heart disease when compared to people who consumed much less vitamin K2. [6,8]. People who have had weight loss surgery. Gastric bypass and other bariatric surgery procedures affect your body’s ability to absorb vitamin K, so adding a vitamin K supplement to your diet after weight loss surgery is a common recommendation from doctors ( 3). How we ranked The only side effects to be aware of are the potential interactions with medications for blood thinning, like warfarin. Vitamin K isn’t just used for heart and bone health. It’s also a common remedy for spider veins and skin bruises. Mary Ruth’s is a great brand that makes a double-duty liquid vitamin K supplement that’s equally well-suited for taking as an oral supplement or applying directly to skin.Vitamin K is an essential nutrient for optimal health, benefitting your heart and bones. Foods rich in vitamin K include spinach, kale, broccoli, lettuce, blueberries, figs, cheese, eggs and soybeans. However, even the healthiest diets don't provide all the vitamin K your body needs, so a high-quality supplement is important. What does vitamin K do? Vitamin K, as shown in clinical studies, plays a vital role in maintaining your bones healthy. It also functions as a clotting element in the arteries. Poor vitamin K levels affect health of the entire cardiovascular system. Without adequate vitamin K, calcium in the blood can bind to the arterial wall, resulting in calcification. As we age, even low vitamin K deficiency can pose risks to the vascular system. In post-menopausal women, poor vitamin K status is shown to be associated with increased bone loss. Multiple studies have shown vitamin K’s value to maintaining arterial health. And vitamin K supplementation is a good way to support healthy bone strength and bone density. Solgar Vitamin K2 is a straightforward, simple vitamin K2 supplement with 100 micrograms of vitamin K2 per capsule. Aside from silica as a binder and filler, the supplement design is fairly clean and simple, though not the best. 9. Now MK-7 K2

If you are taking any other medications, you should still book an appointment with your doctor to determine if a Vitamin K supplement is right for you. In the study, the authors randomly assigned 244 older women to either a placebo supplement or an MK-7 vitamin K supplement (180 mcg per day). Unlike many supplement trials, the follow-up period in this study was quite long, at three full years. The MK-7 form has a longer elimination half-life in your body, but aside from this difference, scientists don’t know yet if there are any meaningful nutritional differences between the MK-4 and MK-7 forms of vitamin K2 (or indeed, any meaningful differences between vitamins K1, K2, and K3) ( 6 ). Well, I saw a new maybe product by Life Extension called Super K Elite, which has not only K1, but K2 MK4, MK6, MK7, and MK9. When I saw this I got pondering, because I had never heard of these other kinds before.

A: Vitamin K2 in supplements is going to be one of two forms: MK-4 or MK-7. The MK-4 form is extracted from specific bacteria that produce this form of vitamin K2, while the MK-7 form is isolated from natto, a fermented soy product. Related articles The MK-4 form is found in butter, eggs, lard, and other animal products (often because a synthetic form of MK-4 is added to animal feeds). Effective K2 dosage. We looked for supplements that provided enough vitamin K2 to take even a poor quality diet up into the range of adequate dietary intake of vitamin K2, according to the most recent dietary guidelines from the Food and Nutrition Board. Vitamin K2 is sometimes called menaquinones, but it’s worth noting that not all menaquinones are Vitamin K2 — there are several kinds.( 11) In contrast, vitamin K2, which is found in small amounts in cheese, egg yolks and some meats, has been found to be up to eight times more bioavailable than K1 and to remain active in the body for a longer period of time.