Menaquinone-4 (MK-4)
Menaquinone-4 (MK-4) is a unrated form of Vitamin K, used in 124 on-market products .
124
on-market products
unrated
quality tier
n/a
elemental fraction
Why this tier: Used at much higher pharmacological doses (45mg/day, as menatetrenone) for osteoporosis in Japan; generally understood to have a short half-life similar to K1's, but no verified head-to-head MK-4-vs-MK-7 PK study was found.
Source: uncertain -- needs review