一是，Vitamin D-3 和 Vitamin K-2 是 fat-soluble vitamin，不能同時吃，所以可能不該買 Vitamin D-3 & K-2 在一起的，Vitamin D-3 & K-2 兩者服用最好隔開3個小時；
二是，Vitamin K-2 是用 mk-7？還是 mk-4?，還是兩者都同時服用？Vitamin K-2 mk-7 Dosage Recommendations 是 0.18 mg/day (180 µg/day)，這個應該是預防保健服用的劑量。而 Vitamin K-2 mk-4 Dosage Recommendations is 45 mg，可能是治療大劑量，不是預防保健的劑量。Vitamin K-2 mk-4 成品有 100 mcg的，這個是預防保健服用的劑量？
三是，在Amazon上看到負麵評論：
Vitamin K-2 mk-7
"Worst tachycardia ever!!!
i developed rapid heart beat after taking my first pill. I could tell within a couple of hours I was very anxious and high anxiety. When I went to bed I could not sleep and I never have that problem. I woke around 3a.m. with tachycardia. My pulse was 135. We headed to ER. This continued thru the night. Finally, the next day it went away after 12 hours or so. The. I was drained. Please take precaution with this supplement. I am fine now."
Vitamin K-2 mk-4
"Read up on side effects-not returnable and dangerous to some
Wish I could return this. After taking one dose, ended up in ER with low blood pressure and fast heart rate. I was scared to death that I had done permanent damage to my heart. Luckily I did not and after 12 hours everything resolved. Please look up the possible side effects before taking K2. Mine is considered rare, but I’ve now read of others on Amazon suffering similar."
所以吃不準是不是該開始補鈣、Vitamin D-3 、Vitamin K-2 ？
如果想開始，這是我能總結出來的：
Calcium + Vitamin D-3：
Vitamin K-2 mk-7:
（https://www.amazon.com/NOW-Supplements-Cardiovascular-Supports-Capsules/dp/B076Y6WRKH/ref=cm_cr_arp_d_pl_foot_top?ie=UTF8）
如果同時要Vitamin K-2 mk-4:
目前隻能算是在做homework，及時記錄從大家的討論中了解的一些信息。到底該怎麽做？還是有些模糊。
