At 3:50 PM -0400 8/21/10, Adrienne Smith wrote:
>Does anyone know if grass-fed meat fat contains appreciable amounts of vitamin k 2?

best animal source would be grass fed organ meats, butter, cheese

FYI, RDA is around 120 mcg / day

The 2008 edition of the PDR for Nutritional Supplements says that a study using 90mg (that's 90,000 mcg)
per day, for 24 weeks, seems to indicate no apparent toxicity at that level.

An oft cited 2006 study "Vitamin K2 treatment for postmenopausal osteoporosis in Indonesia"
   http://www.ncbi.nlm.nih.gov/pubmed/16594930
used 45mg per day for 48 weeks and resulted in significant increase in bone mineral density.

I currently get about 2100 mcg of K a day via supplements (aprox 100 mcg K2 as MK7,
1000 mcg K2 as MK4, 1000 mcg K1) and would like to get several times that much.

I expect to see higher dosage supplements hit the market in the next few years.

-- 
------------------------------
 [log in to unmask]      Ben Liberman
------------------------------