Methylated Vitamins Bypass a Genetic Bottleneck, But More Isn't Always Better
Methylated B vitamins reduced homocysteine by roughly 30% and LDL cholesterol by about 7.5% compared to placebo in people carrying common gene variants that impair normal B vitamin processing. That's a meaningful result. But the same research that makes the case for methylated forms also raises a less comfortable point: too much synthetic folic acid or B12 over time may disrupt the very methylation pathways these vitamins are supposed to support, with potential links to cancer risk and altered neurodevelopment. The story of methylated vitamins is really a story about a biochemical bottleneck, who it affects, and why the form of the vitamin you take matters as much as whether you take it at all.