This is a GREAT source of the best, most absorbable form of K2 (MK-7) & it's also a decent price. I have ordered this a few times for my grandma & this has been her healthiest "Cold & flu" season to date (she is also taking D3 5,000 IU & glutathione with this K2 MK-7). She has had at least 1 ER visit a winter for respiratory illness the past 6 or so years, but so far this season she has avoided the ER, minus when she broke some ribs trying to launch a boat from a slippery boat launch (she's quite an active gal, or at least she tries to be... I'm trying to convince her that she should probably not ride on motorcycles anymore, being in her 80s, but she doesn't listen too well.. at least she listened and is taking the 3 supplements I told her to take :). Taking K2 MK-7 with D3 is important because the K2 prevents the D3 from causing calcium deposits in one's heart. Taking D3 alone (especially at "high" doses of 5,000 iu or more) puts you at risk for that complication. The heart is NOT something to mess around with, so if you are taking D3, do some research for yourself about taking K2 MK-7 along with it). I WOULD & have purchased this again for her & myself too