Folic Acid 400 mcg by Mason Natural — Ingredients, Evidence & Safety

🟡 60/100

Review before taking

Folate: 665mg is 665.0× the Tolerable Upper Intake Level (1.0mg)
100% of ingredients have research evidence

C Label Compliance Grade

Product Label

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Safety Alerts

⚠️ Folate: 665mg is 665.0× the Tolerable Upper Intake Level (1.0mg)

This product received a low safety score because the amount of folate it contains significantly exceeds the recommended maximum daily limit.

Label Data

1 Tablet(s) Serving Size

Vitamin Product Type

100% Evidence Coverage

Supplement Facts — Evidence Check

Folate

665 mcg DFE (166% DV)

⚠️ Exceeds Tolerable Upper Intake Level by 665.0× (UL: 1.0 mg) 📚 225 studies (Tier A: 10, B: 105)

RDA 0.4mg This product: 665mg UL 1.0mg

Other Ingredients

Whey Microcrystalline Cellulose Calcium Carbonate Croscarmellose Sodium Stearic Acid Magnesium Stearate

Label Claims — Verification

❓ All Other

❓ Structure/Function

All Other (99% of products) Structure/Function (77% of products) Nutrient (60% of products) Approved Health (5% of products)

Target Groups

Adult (18 - 50 Years) Adult Female (18 - 50 Years)

Product Information

📋 Directions for Use

Directions: Adults - Take one tablet daily, preferably with food, as a dietary supplement.

⚠️ Warnings & Precautions

Allergen certification - This product contains milk derivatives (Whey).

Warning: If you are pregnant, nursing, taking any medications or planning any medical procedure, consult your physician before use.

Discontinue use and consult your physician if any adverse reactions occur.

Keep out of reach of children.

Tamper-evident seal: Do not use product if seal appears tampered.

🧪 Formulation Notes

May support cardiovascular health & women of childbearing age

Guaranteed no added: Starch, yeast, soy, corn, wheat, egg, fragrance, artificial colors or flavors and preservatives. Sodium free.

Soy free

Additional Information

Mason Guarantee Laboratory Tested cGMP Certified Good Manufacturing Practice Certified

N Mason Natural Est. 1967

DFE - Dietary Folate equivalents

Store in a dry place under controlled room temperature: 20 degrees - 25 degrees C (68 degrees - 77 degrees F).

Product Details

UPC / SKU 3 11845 06531 5

DSLD Entry Date 2020-02-26

Product Type Vitamin

Form Tablet or Pill

Brand Mason Natural

DSLD ID 214529

Data Updated 2026-04-11

Research Evidence

363 Research Sources

57 Avg Quality Score

187 Meta Analysis

56 Systematic Review

54 Rct

29 Guideline

26 Clinical Trial

6 Cochrane Review

2 Regulatory Source

1 Other

1 Openfda Safety

A Homocysteine-lowering interventions for preventing cardiovascular events

Meta Analysis The Cochrane database of systematic reviews 2017

PubMed DOI

A Community-based intervention packages for reducing maternal and neonatal morbidity and mortality and improving neonatal outcomes

Meta Analysis The Cochrane database of systematic reviews 2015

PubMed DOI

A Folate Intake and Risk of Pancreatic Cancer: A Systematic Review and Updated Meta-Analysis of Epidemiological Studies

Meta Analysis Digestive diseases and sciences 2021

PubMed DOI

A The Association Between the Risk of Hypertensive Disorders of Pregnancy and Folic Acid: A Systematic Review and Meta-Analysis

Meta Analysis Journal of pharmacy & pharmaceutical sciences : a publication of the Canadian Society for Pharmaceutical Sciences, Societe canadienne des sciences pharmaceutiques 2021

PubMed DOI

A A Comparative Study Evaluating the Effectiveness of Folate-Based B Vitamin Intervention on Cognitive Function of Older Adults under Mandatory Folic Acid Fortification Policy: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Meta Analysis Nutrients 2024

PubMed DOI

A Associations between serum Homocysteine, vitamin B9, and vitamin B12 levels and the formation of intracranial Aneurysms: A systematic review and meta-analysis

Meta Analysis Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia 2025

PubMed DOI

A Intake of vitamin B6, folate, and vitamin B12 and risk of coronary heart disease: a systematic review and dose-response meta-analysis of prospective cohort studies

Meta Analysis Critical reviews in food science and nutrition 2019

PubMed DOI

A Beneficial effects of folic acid supplementation on lipid markers in adults: A GRADE-assessed systematic review and dose-response meta-analysis of data from 21,787 participants in 34 randomized controlled trials

Meta Analysis Critical reviews in food science and nutrition 2022

PubMed DOI

A Folic acid supplementation and blood pressure: a GRADE-assessed systematic review and dose-response meta-analysis of 41,633 participants

Meta Analysis Critical reviews in food science and nutrition 2023

PubMed DOI

A Digital tracking, provider decision support systems, and targeted client communication via mobile devices to improve primary health care

Meta Analysis The Cochrane database of systematic reviews 2025

PubMed DOI

View all evidence for Folate →