That is interesting hikerguy. I too, had concerns about the CAC score. My research indicated that the K2 MK 7 does transport calcium in tissues back to bone where it belongs. My CAC score from 2024 was:
The Smartscore calculation is 5429.
The left main coronary artery score is 263.
The LAD score is 1320.
The circumflex score is 37.4.
The right coronary artery score is 3706.
The PDA score is 0. Other: 103
I started 90 mg of K2 MK7 twice a day (180mg) per day.

One year later my CAC score was:
The Smartscore calculation is 4962.
The left main coronary artery score is 298.
The LAD score is 1568.
The circumflex score is 36.8.
The right coronary artery score is 3006.
The PDA score is 0. Other: 53.3

Some arteries calcium increased and others decreased in a year's time. Both scans were performed at the same hospital, same scanner and scored by the same doctor.
I'm planning on another CAC scan this fall keeping to a once per year schedule.
It should be noted that there are two types of calcium, a soft calcium aka plaque inside the artery wall and a hard calcium within the artery wall that cause stiffness to the artery. The K2 MK 7 appears to work on the hard calcium juding from my scores. But scores can still go up and down. I think the K2 MK 7 works of the soft calcium too but the CAC scores do not reflect the soft calcium.
If I remember this fall I'll post my CAC scores for 2026, by the way my chlorestorel scores send my cardiologist into heaven. Perfect he says. LOL Good luck.