I am on rate control and Pradaxa. Longstanding persistent afib. 1000 mg fish oil equals 1 gram fish oil or 3.5 ounces of fish. I don't take fish oil all the time. Also, I don't swallow the capsules as they are huge. I bite down on them, so maybe I'm getting half of the oil and lose half when I throw the gelatin cover out. Same thing with flaxseed. I bite it. I don't take krill oil at the same time. It is whatever I buy at the time. The MK7 is 90 mcg (Jarrow formula). I probably get half of that. I don't always take them. When I have more fish in my diet, I don't take the fish or krill oil. The MK7 is probably the one to worry the most about... it has natto in it. So anyway, I'm not a doctor. My theory is to go low on the portions and alternate the supplements. Maybe I shouldn't take them, but my doctor really didn't put any restrictions on fish. I notice that my coagulation time for cuts is really not that long. No bruises or blood anywhere. You have to follow what your doctor says. That is the bottom line.

My advice is to follow the doctor's advice and eat a balanced diet with fatty fish so you don't have to take supplements. MK7 is a different story. It prevents calcification. petey

petey - K2 (MK7) is derived from natto since natto is the best source for the MK7. However, the manufacturers sell the natto without any K2 as a separate supplement. The natto which I take, does not have any K2 in it. I buy K2 supplement as a separate item. So, you do NOT have to worry about natto in your K2.

Also, I remember, another member (I think it was missed1234), reported that she was taking K2 (MK7) and it did NOT have any effect on her coagulation tests for Coumadin. She was taking K2 based on her doctor recommendation.

Recent research shows that K2 (in natto, eggs, some hard cheeses) does not affect the blood clotting. It is the K1 (in greens), which has to do with clotting of the blood. K2 vitamin is for transferring the calcium to the bones, otherwise the calcium might go to the lining of the arteries and cause calcification/heart disease. So, if you are taking calcium and vitamin D3, you must take K2 so the calcium goes to your bones rather than the arteries and joints (soft tissues in the body). This is pretty new about the K2 versus K1, and most doctors and providers do NOT differentiate the functions between these two vitamins. They assume any K vitamin (K1 or K2) will affect the clotting of the blood.

I take about 35 mg of K2 (MK4) every day. MK4 only stays in the body for 2 hours or so. However, MK7 life in the body is about 24 hours and it is much cheaper since you do not have to take so much of it. But, MK4 is much more potent than MK7.

Here is the K2, MK4 that I take:
http://www.iherb.com/Thorne-Research-Vitamin-K2-1-fl-oz-30-ml/21592

Here is another K2, MK4, but not as pure as the one from Thorne:
http://www.iherb.com/Carlson-Labs-Vitamin-K2-5-mg-60-Capsules/6116#p=1&oos=1&disc=0&lc=en-US&w=vitamin%20k2&rc=240&sr=null&ic=2

Here is K2, MK7, derived from natto:
http://www.iherb.com/Now-Foods-MK-7-Vitamin-K-2-100-mcg-60-Veggie-Caps/36220#p=2&oos=1&disc=0&lc=en-US&w=vitamin%20k2&rc=240&sr=null&ic=29

Please read the reviews for them.

Scott

Scott: Great info. Thanks. petey

Yes, no problems with K2 MK7. In fact I think it helps regulate my INR.
I am not a big veggie eater and I think the K7 helps.

Thanks everyone for the input. It really helped a lot.

Nannette,

I am not sure if you saw this one. In the case you did not and you want to take 45 mcg of K2 (MK7, derived from natto), here is the link to 45 mcg K2 at iherb.com:

http://www.iherb.com/Doctor-s-Best-Natural-Vitamin-K2-Mena-Q7-45-mcg-60-Veggie-Caps/9404#p=1&oos=1&disc=0&lc=en-US&w=vitamin%20K2&rc=241&sr=null&ic=9

Take care,
Scott

Thank you Scott.