Menaquinone-7 (MK-7)
Menaquinone-7 (MK-7) is a unrated form of Vitamin K, used in 1,459 on-market products .
1,459
on-market products
unrated
quality tier
n/a
elemental fraction
Why this tier: Genuinely contested: a much longer half-life than K1, with stable serum levels and 7-8-fold accumulation on prolonged intake (Schurgers 2007), gives much more sustained circulating levels, argued to better serve extrahepatic (bone/vascular) carboxylation, but head-to-head superiority on hard clinical outcomes vs K1 is not firmly established.
Source: Schurgers LJ et al. 2007, PMID 17158229