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That appears to be the article that the Daily Mail is referencing. The problem with folic acid supplementation is that it can mask a B12 deficiency, and that isn't good. You can get a pernicious anemia, but some folks get neurological deficits before the anemia becomes manifest. When someone presents with a severe change in mental status, among other things to rule out are folic acid and B12 deficiencies.
A scan revealed that the 57-year-old, who was on blood pressure treatment, had a clot on the brain which had come from a coronary artery that was almost completely blocked.
That statement doesn't make anatomical sense unless there's an abnormal communication between a coronary artery and the arch of the aorta.
Elevated homocysteine levels are also associated with deep vein thrombosis, aka clots. If they dislodge and get to the lungs, your in a world of hurt with a pulmonary embolism.