Cardiovascular Health Supports Healthy Homocysteine Levels Important for Nervous System Function GMP Quality Assured A Dietary SupplementVitamin B-6 is one of the more popular members of the B-vitamin family and is found in fresh vegetables. Clinical studies have shown that B-6 plays an important role in regulating homocysteine levels in the body. Homocysteine is produced as a by-product of the demethylation of methionine and can be toxic in elevated amounts.