The MTHFR C677T variant causes a change in the shape of the MTHFR enzyme and decreases its ability to bind to FAD.[ref] If you have high homocysteine (a marker for heart disease risk), several studies show that increasing riboflavin lowers homocysteine levels in those with the A/A genotype.[ref][ref] Other research points to riboflavin lowering homocysteine levels only if vitamin B6 levels are adequate.[ref] Bone health : Low riboflavin status in women with MTHFR C677T increases the risk of fractures in osteoporosis.[ref][ref] Related article : Osteoporosis risk factors and genetic variants Heart health: The C677T variant causes a change in the shape of the MTHFR enzyme and decreases its ability to bind to FAD.[ref] If you have high homocysteine (a marker for heart disease risk), several studies show that increasing riboflavin lowers homocysteine levels in those with the A/A genotype.[ref][ref] A 2025 study found that low riboflavin levels combined with the MTHFR C677T homozygous genotype were at an increased risk of hypertension.[ref] Other research indicates that riboflavin lowers homocysteine levels only when vitamin B6 levels are adequate.[ref] Related Articles : MTHFR, Riboflavin, and Blood Pressure | Vitamin B6 Genes Riboflavin affects gene expression: In people with MTHFR C677T (AA genotype, below in genotype report), researchers found that there was higher DNA methylation of NOS3
Interpreting Your Vitamin B12 Test Results Normal reference ranges for vitamin B12 can vary slightly between labs, but generally: Normal : 200-900 pg/mL Borderline : 200-300 pg/mL (often requires further investigation or clinical correlation) Deficient : 200 pg/mL If your levels are low, your doctor will discuss treatment options, which may include dietary changes, oral supplements, or injections
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The panel's vote is not binding but is likely to embolden Health Secretary Robert F Kennedy Jr., who has described himself as a big fan of peptides and vowed to overturn FDA restrictions put in place under President Joe Biden
