It looks like a legit company, and it’s true that many people with borderline cholesterol levels have clogged arteries and even heart attacks. If you have cholesterol levels around or over 200 or any other risk factors, I would see a cardiologist first. They can do some of these tests. Also, you can get a more extensive bloodwork test that includes Lipoprotein (a) and ApoB. You can ask your PCP to add these tests to your annual checkup. Or order them yourself from Quest or a more specialized company such as FunctionHealth:
What'''s Included.
For a more detailed explanation, check this recent review article
ScienceDirect