26 Jun 2014 Blackmores Institute B vitamins improve cognition and lower abnormal homocysteine levels in older people 26 Jun 2014 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News All middle aged and elderly people with high serum homocysteine should be taking vitamin B supplements to lower the blood levels and improve cognitive function, Chinese researchers recommend. High serum homocysteine or hyperhomocysteinemia (HHcy) is a medical condition characterised by an abnormally high level of homocysteine in the blood, conventionally described as above 15 µmol/L. × To continue reading this article, please Log In or Sign Up for access.