High homocysteine doesn't usually cause symptoms on its own, but it can signal vitamin deficiencies or other health issues and it's something you can check with a simple blood test CPE Monthly: Managing Hyperhomocysteinemia Today's Dietitian Magazine Homocysteine metabolism as the target for predictive medical approach, disease prevention, prognosis, and treatments tailored to the person EPMA Journal Springer Nature Link Homocysteine Nutrition Articles London Clinic Of Nutrition Amazon.com: Allergy Research Group Homocysteine Plus Supplement with Setria Glutathione, Vitamin B Complex, Trimethylglycine, Vegetarian Capsules 90 Count : Health & Household