From https://www.labtestanalyzer.com, referring to lower than optimal ranges. (note: labtestanalyzer is a very young project of Joe Cohen, therefore always check it's references yourself)
Optimal Range: 5 - 9 umol/L
Homocysteine is necessary for the production of factors important for detoxification. Low homocysteine may restrict detoxification pathways that respond to oxidative stress [R].
Low homocysteine is associated with nerve damage of unknown cause (idiopathic peripheral neuropathy) [R].
Make sure your diet is well-balanced. Homocysteine is produced from the amino-acid methionine. Your diet should include enough methionine-rich foods, such as beef, lamb, turkey, pork, fish, shellfish, cheese, eggs, dairy, nuts, soy, and beans.
I've never figured out how to do proper methylation for my illness. As in my energy has never improved, so I don't know what the heck is going on. 23 and me showed several gene kinks and Klimas asked me to be in her recent folate trial, but I declined as I have this low homocysteine problem.
I do need my mb12 injection or oils I get from Australia which stop my hand tremors. Potassium pills daily and adding folate took away very frequent headaches. When I ran out or forgot the folate, I'd have odd pain in my neck or chest.