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(More customer reviews)I really don't know what to write, but I feel that I owe people something, even if not at all profound. For years, I have been on warfarin (Coumadin), a "blood thinner." It is a Vitamin K "antagonist," meaning that Vitamin K and Coumadin don't play well together, though there is growing belief that this does not apply to Vitamin K2, as opposed to Vitamin K1. At any rate, I switched to a new blood thinner (more accurately, an anticoagulant) last November, one that, presumably does play well with Vitamin K, and I have been seeking to play catch-up with the effects of Vitamin K deprivation on things like bone health. In recent years, there is increasing evidence that it is the K2 fraction of Vitamin K that is responsible for bone health, so I have been reading up about Vitamin K2. Apparently, there are two main variations of K2, so called "vitamers" MK4 and MK7. The type being reviewed here is Vitamin K2, MK7, which is a product of fermented soy beans, or "natto." (As an aside, natto is a breakfast staple in Japan. It is a sticky and not very appealing goo to Western palates, what you might consider an acquired taste. I tried it a few times while on business in Tokyo, and I NEVER acquired the taste!) MK4 is an animal produced product, and therefore thought by some to be more bioavailable to humans than MK7 which is a vegetable product. Both apparently improve bone health, and one or the other, or both, are given in high doses (75 mg) to post-menopausal women in Japan to forestall osteoporosis. I still don't know which is better for me, MK4 or MK7, and what dose is optimal (I am a male senior citizen--getting more senior every year). So, I ordered this from Amazon just as a start. True to Amazon's fine service, it arrived in two days, and I am close to the end of the bottle. I have since ordered an even higher dose of MK7, made by Solgar, to take next. In the short time that I have been taking Vitamin K2 MK7, I really can't tell if it has had any effect on me. My fingernails seem a bit stronger, but I haven't been taking it long enough for a full replacement of nail tissue, so it could all be in my mind. I gave the product four stars as a best guess. Consider that rating arbitrary.
Another note about Vitamin K2 and so many, many other medications (like heparin, for example) or "food supplements" or just plain food that we ingest (do pet food and powdered milk for baby formula come to mind?): most are made abroad in China, India, and, if you recall headlines a few years ago, in questionable labs in Puerto Rico. I looked up Vitamin K2 on alibaba.com, an import agent. Just about every source of Vitamin K2 was China. None of the vitamins that we order are labeled as to country of origin, but, of course, there's no need for concern because our government exercises strict quality control, right?
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