Alternative Medicine
B vitamins can help lower too high homo-cysteine. Elevated homocysteine has been found to be a common feature in some schizophrenics. In such cases the following is recommended - Folic acid, vitamin B6 and vitamin B12, pyridoxal 5-phosphate (PLP) (the active form of vitamin B6 in the body), betaine (trimethylglycine), and N-acetylcysteine (NAC). 
Also recommended is additional fiber to help increase blood folic acid levels, a decreased dietary intake of the homocysteine precursor methionine, an increased choline intake to help convert homocysteine to safer amino acids, and more physical exercise.
B 9 (folate) and B 12 may help to lower blood homocysteine levels, which have been implicated in the development of cardiovascular disease.  http://www.chsir.com/News.htm
High homo-cysteine may be lowered with TMG (tri-methyl-glycine) with B6, B12 & folic acid.  TMG has 3 methyl groups attached to glycine.  TMG donates one of its methyl groups to cellular DNA to protect against DNA damage. 5/2006 www.lef.org 
McCully, Kilmer + McCully,Martha The Heart Revolution: The Extraordinary Discovery That Finally Laid the Cholesterol Myth to Rest  (more)  thioretinaco ozonide, homocysteine approach, free radical oxygen compounds, Heart Revolution, Food Pyramid    
Rowen's, Dr Robert Jay - Second Opinion 5/2006  "You can bring (elevated body chemical/amino acid) homycysteine levels down with...vitamins B6 (100mg), B12 (by injection), folic acid (800mcg), and DMG (100mg) or TMG (500mg) taken daily...B12 is the most beneficial of the group."   Homocysteine may contribute to macular degeneration, heart disease, failing memory and Alzheimer's. 2/9/2006 New England Journal of Medicine
Spirulina  - http://www.eatlikeeve.com/powerfulhealth/page_29.php - " Spirulina is an amazing food source containing all 72 minerals of the body (if grown right) with all the B vitamins including B12. Most people don't know that on the moon they are growing spirulina for its powerful ability to turn sunlight into usable oxygen. This powerful micro algae differs from sun chlorella but is just as powerful in different ways...Sun Chlorella is a genus of single-celled green algae. When it was discovered in the 1940s it was thought to be the answer to world hunger."


Monitor your methionine, a homocysteine precursor (implicated in heart disease and schizophrenia). 
SAM-e is shorthand for S-adenosyl-methionine, a chemical shown to have pain-relieving and anti-inflammatory (plus anti-depression) properties . SAM-e can be found in high-methionine seeds [sunflower (Helianthus annus)] and Brazil nuts (Bertholettia excelsa). It would take 250 grams of sunflower seeds or (about 9 ounces) or 500 grams of Brazil nuts (18 ounces) to provide a dose of SAM-e that's more effective than a standard dose of ibuprofen.
http://www.arthritissupport.com/library/showarticle.cfm/id/948 (ALERT:  Do NOT take if becoming mannic.)