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Vitamins & vitamin-like compounds

Vitamin B9 (Folate)

Vitamin B9 (Folate) (water-soluble vitamin / folate vitamer family)

Vitamin B9 is the folate family; for a useful product comparison, compare folate in DFE, identify the exact form, and apply pregnancy or medication guidance to that form rather than to “B9” generically.

Water SolubleClinical ResearchForm Dependent EvidenceLow Risk Profile
Updated August 2026/4 min read/2 citations
Reviewed by the NootropicsIndex editorial team.Method: prioritize cited human research and official safety or regulatory sources; compare retailer-listed prices without endorsing products.Affiliate disclosure
Supplement group

Vitamin B9 (Folate) belongs to the Vitamin B group

View all Vitamin B productsVitamin B12 (Cobalamin)Vitamin B1 (Thiamin)Vitamin B2 (Riboflavin)Vitamin B3 (Niacin)Vitamin B5 (Pantothenic Acid)Vitamin B6Vitamin B7 (Biotin)
01

What is it?

Identity and form

1

Vitamin B9 is the folate family.

Pregnancy and preconception2
The pregnancy RDA is 600 mcg DFE. In the United States, people capable of becoming pregnant are advised to obtain 400-800 mcg/day folic acid in addition to food folate; folic acid is the form with direct evidence for neural-tube-defect risk reduction, and this evidence should not be assumed for 5-MTHF.
02

Names, aliases and forms

AbbreviationB9
Common NameFolate
03

Mechanisms of action

Biological role

1

Folate coenzymes carry one-carbon units needed for nucleotide synthesis and methylation reactions.

04

Potential effects and evidence map

Evidence is strong for the essential nutrient role of folate, but supplementation beyond adequacy has not been shown to produce a reliable general nootropic effect in well-nourished adults. Form-specific clinical uses should be evaluated separately.

Effect domainMagnitudeGrade
Mental energy / wakefulness1
UnknownConfidence: Medium

Evidence does not establish a reliable mental-energy effect from extra Vitamin B9 (Folate) in well-nourished healthy adults.

Note Essential nutrient biology and correction of inadequate status are different from enhancement.

1/5
C
Memory / learning1
UnknownConfidence: Medium

Direct evidence does not establish a general memory or learning benefit from Vitamin B9 (Folate) for healthy adults.

Note Keep form- and population-specific clinical research separate.

0/5
C
05

Typical dosages and timing

Nutrition benchmark1400 mcg DFE/day

Use this to interpret labels and total intake, not as a demonstrated nootropic dose or recommended cycle.

06

Timing & effect horizon

Effect horizonUnknown
Unknown
What timing evidence can show1

No reliable acute nootropic onset, duration, The time for blood levels to fall by half during the final elimination phase.Source claim, or routine cycle is established for Vitamin B9 (Folate). Nutrient-status correction and clinical follow-up periods answer different questions.

07

Safety, side effects and risk profile

Evidence uncertainty1
Confidence: High

Marketing claims extend beyond the established nutrient or precursor evidence.

Note Separate adequacy, biochemical activity, and enhancement outcomes.

1/5
B
Interaction risk1
Confidence: Medium

Medication, laboratory, and total-intake context can change the practical risk.

Note Check the official source for ingredient-specific interaction details.

2/5
B
GI discomfort1
Confidence: Medium

Tolerability varies with the specific form and amount consumed.

Note This row summarizes ordinary tolerability rather than special-population hazards.

1/5
B
Dose- and form-specific safety1

High supplemental folic acid can correct megaloblastic anemia while neurological effects of vitamin B12 deficiency continue. The adult UL for folic acid from supplements and fortified foods is 1,000 mcg/day.

08

Interactions and cautions

Medication and test context1

Folate supplements can interact with methotrexate, some antiepileptic medicines, and sulfasalazine.

09

Practical buying and quality notes

  • Compare folate in DFE, identify the exact form, and apply pregnancy or medication guidance to that form rather than to “B9” generically.1
10

FAQ

What distinguishes Vitamin B9 (Folate) from related forms?

1

Food folates, folic acid, L-5-MTHF, and folinic acid differ in evidence, labeling units, and clinical context.

11

References

  1. NIH Office of Dietary Supplements. Folate Fact Sheet for Health Professionals.
  2. NIH Office of Dietary Supplements. Dietary Supplements and Life Stages: Pregnancy Fact Sheet for Health Professionals.
Note

This page is informational and summarizes available evidence. It is not medical advice, a recommendation, or a substitute for guidance from a qualified clinician.