Not much to go on here, can't tell if this is dietary or supplements. Your doctor should be subscribing to The Lancet. You can check out other commentary here:
http://oc1dean.blogspot.com/2011/12/jama-commentary-contends-vitamin.html
The Lancet here:
http://www.thelancet.com/journals/laneur/article/PIIS1474-4422%2812%2970094-7/fulltext
Vitamin B12 and folate are key mediators of homocysteine metabolism. Low plasma vitamin B12
and folate concentrations are associated with hyperhomocysteinaemia,
with consequent premature atherosclerosis and increased risk of
cardiovascular and cerebrovascular disease.1,2
In a meta-analysis of observational studies, a 25% reduction in
homocysteine concentrations (roughly 3 μmol/L [0·41 mg/L]) corresponded
with an 11% lower risk of ischaemic heart disease and a 19% lower risk
of stroke.3 The Heart Outcomes Prevention Evaluation 2 (HOPE 2) trial4 and re-analysis of data from the Vitamin Intervention for Stroke Prevention (VISP) study5 (both trials in which patients received high doses of B vitamins) have confirmed these findings for stroke.
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