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“ Menatetrenone (3 × 10−6‐3 × 10−5 M) inhibited the bone resorption induced by IL‐1α (2 U/ml), PGE2 ( 10−7 M ), PTH (3 × 10−7 M), and 1,25‐(OH)2D3 (3 × 10−10 M) in a dose‐dependent manner.”
Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research • 1993 | View Paper
“However, photostabilizers such as DL methionine and sodium metabisulphite may provide additional protection to vitamin k1 when it is stored in less effective light-resistant containers.”