vitamin · for headaches/migraines
Vitamin B12
Lowers a compound linked with more frequent migraines and with blood vessel irritation.
Say that in clinical terms
Elevated homocysteine is associated with increased migraine frequency. B12, along with folate and B6, lowers homocysteine through the methionine synthase pathway, reducing vascular inflammation and endothelial dysfunction.
How strong is the research?
The B-vitamin combination did not lower the blood marker it was meant to lower.
3 papers read, 1 supporting, 1 against.
Who was studied: Migraine-with-aura patients carrying one specific gene variant.
How much to take
daily
1000 mcg
Often combined with folate and B6 for homocysteine lowering. May be especially helpful for migraines with aura.
Before you take it
- No NIH ODS or IOM Tolerable Upper Intake Level (UL) has been established for vitamin B12 in any form; the IOM found no adverse effects attributable to excess intake from food or supplements in any population studied and set no UL.
- Metformin significantly reduces B12 absorption by impairing calcium-dependent membrane action in the terminal ileum; patients on long-term metformin are at elevated risk of B12 deficiency and should have serum B12 monitored periodically.
- Proton pump inhibitors (PPIs) and H2-receptor antagonists reduce gastric acid secretion needed to release protein-bound dietary B12, thereby reducing absorption from food; this effect is substantially less pronounced for free supplemental B12 forms.
- High-dose folic acid supplementation can mask the hematological signs of B12 deficiency (megaloblastic anemia), potentially allowing neurological damage from covert B12 deficiency to progress undetected.
- Rare anaphylactic reactions have been reported with parenteral (injectable) B12 preparations; no equivalent hypersensitivity risk has been established for oral or sublingual supplemental forms.
- Individuals with Leber's hereditary optic neuropathy should avoid high-dose cyanocobalamin; methylcobalamin is the preferred supplemental form when B12 supplementation is clinically indicated in this population.
When to take it
Best taken: morning
What we make of it
The trial gave three B vitamins together, not B12 alone.
The detail
The study tested folic acid, B6 and B12 as a combination. The effect, if any, belongs to the mix rather than to B12 — and the dose we list does not match what was given.