Folate
Folate is a water-soluble B vitamin your body cannot make on its own (vitamin B9; folates). You get it from food—especially leafy greens, legumes, and fortified grains—or as folic acid in supplements. After absorption in the small intestine, the body converts it into active forms (tetrahydrofolate, THF) and stores a small amount in the liver. At home blood testing is available in select states. See FAQs below
Folate
Folate blood testing measures the amount of folate (vitamin B9) circulating in your blood. Folate is an essential, water‑soluble nutrient the body cannot make; you get it from foods and supplements (folic acid). After absorption in the small intestine, it is converted to active forms—mainly 5‑methyltetrahydrofolate (5‑MTHF)—and carried to tissues. At home blood testing is available in select states. See FAQs below
Folate, RBC
Folate, RBC is a measure of the folate stored inside your red blood cells. Folate is a B vitamin from food (vitamin B9) absorbed in the small intestine and converted into active forms (tetrahydrofolate, 5‑methyltetrahydrofolate). As red blood cells are produced in the bone marrow (erythropoiesis), they take up folate and keep it for their lifespan. At home blood testing is available in select states. See FAQs below
Homocysteine
Homocysteine is a sulfur‑containing amino acid your body makes as it breaks down methionine from dietary protein. It is not taken in from food; it appears briefly inside cells as a crossroads in the methionine cycle. From there, it can be recycled back to methionine using folate and vitamin B12 (remethylation via 5‑methyltetrahydrofolate and methionine synthase), or shunted toward making cysteine using vitamin B6 (transsulfuration via cystathionine β‑synthase). At home blood testing is available in select states. See FAQs below
Homocysteine
Homocysteine blood testing measures the level of homocysteine, a sulfur-containing amino acid that appears as a normal byproduct when the body uses methionine from protein. Homocysteine is made inside cells and briefly circulates in the blood before being recycled back to methionine or converted into cysteine and glutathione. At home blood testing is available in select states. See FAQs below
Methylmalonic Acid (MMA)
Methylmalonic acid (MMA) is a small organic acid your body produces while breaking down certain proteins and fats. It forms inside mitochondria during the propionate pathway, where fragments from odd‑chain fatty acids and specific amino acids are converted toward energy use. At home blood testing is available in select states. See FAQs below
Vitamin B12
Vitamin B12 blood testing measures the amount of vitamin B12 carried in your bloodstream. Vitamin B12 (cobalamin) is an essential nutrient obtained from animal-based foods and supplements. After eating, stomach acid frees B12 from food; it binds to a stomach-made carrier called intrinsic factor and is absorbed in the last part of the small intestine (ileum). At home blood testing is available in select states. See FAQs below
Vitamin B12
Vitamin B12 powers cell division, red blood cell production, and the maintenance of myelin—the insulation on nerves. A blood B12 test is a readout of the body’s capacity to make DNA efficiently, carry oxygen, and keep the brain and peripheral nerves functioning smoothly. At home blood testing is available in select states. See FAQs below
Vitamin B2 (Riboflavin)
Vitamin B2 (riboflavin) blood testing measures the amount of riboflavin circulating in your blood, largely present in its active forms. Riboflavin is a water‑soluble B vitamin your body cannot store well and must obtain from the diet. After absorption in the small intestine, it travels in the bloodstream mainly as flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), which are taken up by tissues as needed. At home blood testing is available in select states. See FAQs below
Vitamin B6 (Plasma)
Vitamin B6 (plasma) is the amount of vitamin B6 circulating in your blood. Vitamin B6 is a water‑soluble nutrient you get from food and supplements. After absorption in the small intestine, the liver converts it into its active coenzyme forms, mainly pyridoxal 5′‑phosphate (PLP) and to a lesser extent pyridoxamine phosphate (PMP), derived from the parent compounds pyridoxine, pyridoxal, and pyridoxamine. At home blood testing is available in select states. See FAQs below
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