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Head-to-head evidence comparison — which supplement is right for you?
Folic Acid vs Vitamin B12: Vitamin B12 has the stronger overall evidence (7.5 vs 8/10); they're alternatives for prenatal support — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Vitamin B12 wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Likely helps
5 of 6 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Folic Acid and Vitamin B12 have evidence — compare verdict strength side-by-side.
400 mcg/day for anyone planning or capable of pregnancy (USPSTF: 400-800 mcg); adult RDA 400 mcg DFE/day, 600 mcg DFE in pregnancy, 500 mcg DFE in lactation (IOM)
Any time of day
Folic acid (pteroylmonoglutamic acid)
500-1000mcg daily for maintenance; higher for deficiency
Morning (may be energizing), With or without food
Methylcobalamin (sublingual)
Periconceptional
Weeks
Weeks to months
2-4 weeks
4-8 weeks
Weeks to months
Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation.
N Engl J Med (1992) · Rct
Randomised trial of periconceptional vitamin supplementation for prevention of a FIRST neural tube defect (PubMed publication types: Randomized Controlled Trial, Clinical Trial)
Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. MRC Vitamin Study Research Group.
Lancet (1991) · Rct
Randomised, multicentre trial of periconceptional folic acid for prevention of RECURRENT neural tube defects (PubMed publication types: Randomized Controlled Trial, Multicenter Study, Comparative Study)
Effects and safety of periconceptional oral folate supplementation for preventing birth defects.
Cochrane Database Syst Rev (2015) · Meta analysis
Cochrane Database of Systematic Reviews CD007950, third edition (PubMed publication types: Meta-Analysis, Systematic Review)
Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis
Irish journal of medical science (2024) · Meta analysis · n=4275
Regarding the hemoglobin level, the pooled effect sizes showed no difference between all routes of administration that could reach statistical significance.
Dosage exploration of combined B-vitamin supplementation in stroke prevention: a meta-analysis and systematic review
The American journal of clinical nutrition (2024) · Meta analysis · n=76664
In areas without and with partial folic acid fortification, combined B-vitamin supplementation significantly reduced the risk of stroke by 34% [RR: 0.66; 95% confidence interval (CI): 0.50, 0.86] and 11% (RR: 0.89; 95% CI: 0.79, 1.00), respectively.
Vitamin Status in Patients with Phenylketonuria: A Systematic Review and Meta-Analysis
International journal of molecular sciences (2024) · Meta analysis · n=3157
24 studies compared 770 people with early-treated PKU and 2387 healthy controls.
Vitamin B12 has a higher evidence score (7.5/10 vs 8/10) and wins in 2 of 3 categories.
For prenatal support, Folic Acid has a higher relevance score (95 vs 80).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
Folate is essential; inositol + CoQ10 are the best bets — but conception evidence is limited.
Commonly recommended vs ask-your-clinician vs avoid — a general, safety-first overview.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.