[nafex] Anticoagulants, Leafy Greens, & Vitamin K

Don Yellman don.yellman at webformation.com
Sat Mar 10 14:18:52 EST 2012

For Elizabeth Hilborn:

Your impression of the effects of consumption of leafy greens (and other 
fruits/vegetables high in vitamin K), seems to be at odds with my 
understanding of the interaction of this vitamin with anticoagulants 
such as warfarin.   Vitamin K does not enhance these anticoagulant 
effects, but rather works directly against them, which can elevate the 
risks of stroke as a result.

That is why people who use blood thinners are advised to avoid excessive 
consumption of green, leafy vegetables, which would tend to negate  the 
anticoagulant effects of the drugs.  The operative factor is high levels 
of vitamin K, which is particularly high in certain vegetables, but 
present to some extent in nearly all fruits and vegetables.  You might 
wish to consult your sources of information on this topic before tucking 
into large spinach salads on a regular basis if you are using blood 
thinners.  I don't know whether Goji berry is high in vitamin K, but if 
it is, that would also be one to avoid for users of blood thinners.

Don Yellman, Great Falls, VA

More information about the nafex mailing list