Evidently I'm a mutant. Turns out that I have a genetic mutation which increases my risk of developing DVT. I also have a high homocysteine level which, when combined with this particular genetic mutation, puts my cardiovascular risk into a high risk level. Vit B and Folic Acid are supposed to reduce my homocysteine level.

The mutation is the methylenetetrahydrofolate (MTHFR) Gene Mutation (C677T). Apparently 8-18% of the population has this mutation.