MTHFR is one of those topics that can send parents down a rabbit hole very quickly. A child has anxiety, allergies, ADHD symptoms, food sensitivities, a tongue-tie, a sacral dimple, or a “sugar bug” vein between the eyes, and suddenly the internet says: “It’s MTHFR.” While it may be MTHFR, the truth is far more nuanced and definitely less scary.