A Vital Test Your Doctor Might Be Missing There's a crucial blood test often overlooked by doctors - called homocysteine. What is Homocysteine? Homocysteine is an amino acid produced from protein metabolism. Normally, your body recycles it with vitamins like B6, B12, and folate. If you’re not getting adequate intake of these nutrients due to a poor diet, poor gut health or absorption, or certain genetic variations, this process can become disrupted and homocysteine levels can rise, leading to se