Comparison guide
Which B-complex should you take?
All three supply the same B vitamins; they differ in the chemical form of folate and B12 and in how far the doses exceed requirements. A B-complex reliably corrects deficiency, but above requirement the extra does little, and megadoses bring their own risks.
The options, compared
| Option | Evidence | Best for | The honest note | |
|---|---|---|---|---|
| B-Complex | Limited evidence | Most people | A basic complex at 1–2x RDA covers the plausible uses, such as B12 for vegans, metformin users and older adults. B-50 and B-100 products deliver thousands of percent of requirement with no evidence that the excess helps. | View |
| Methylated B-Complex | Moderate evidence | Fine, but not proven better | 5-MTHF raises folate status about as well as folic acid, with less unmetabolised folic acid in circulation. No randomized trial shows better health outcomes in MTHFR carriers, so the genotype argument runs ahead of the evidence. | View |
| Stress B-Complex | Moderate evidence | Not worth the higher dose | The small drop in perceived stress seen in meta-analysis is the general B-vitamin effect, with no clear benefit for depression or anxiety, and nothing shows that megadoses add to it. Some formulas exceed the B6 level linked to peripheral neuropathy. | View |
Our verdict
A basic B-complex near the RDA is enough for almost everyone, and it matters most if you are actually short of B12 or folate. Methylated versions are fine if you prefer them but are not proven better, and 'stress' formulas add dose without evidence that the extra helps stress. Whatever you buy, check total B6 across all your supplements, and stop biotin-containing products 2–3 days before blood tests.