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One A Day Women's Complete Multivitamin

7 established essential nutrients

Graded on the nutrient adequacy of 7 labeled ingredients.

B
71out of 100Grade B
Research evidence score

Graded on 7 established essential nutrients · led by Niacinamide

Solid pick. Niacinamide, Folic Acid and Zinc Oxide (+4 more) have real research behind them.

Based on the ingredients we could read from this scan. A full label may include more — like added sugars, colorings or other ingredients — than we captured here.

How the ingredients work together

Known interactions from published nutrition research — separate from the evidence grade.

Iron + Vitamin CWork together

Vitamin C markedly improves non-heme iron absorption by reducing it to its more absorbable form.

Calcium vs IronCompete

Calcium inhibits iron absorption when taken together. If you take this for the iron, consider spacing it from calcium-rich meals or supplements.

Calcium vs ZincCompete

High-dose calcium can reduce zinc absorption — the two compete for uptake pathways.

Iron vs ZincCompete

Iron and zinc compete for absorption when taken together at higher doses on an empty stomach.

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Ingredient breakdown

B
NiacinamideReduces hyperpigmentation and improves skin barrier
Research: Established essential nutrientEvidence strength: Established essential nutrient — extensively researched
B
Folic AcidSupports DNA synthesis and neural tube development
Research: Established essential nutrientEvidence strength: Established essential nutrient — extensively researched
B
Zinc OxideProvides broad-spectrum UV protection
Research: Established essential nutrientEvidence strength: Established essential nutrient — extensively researched
A
MagnesiumImproves sleep quality and muscle recovery
Research: Established essential nutrientDaily Value: 101%Dose: 425 mgEvidence strength: Established nutrient — this product provides a meaningful dose
B
Calcium CarbonateGeneral health support
Research: Established essential nutrientEvidence strength: Established essential nutrient — extensively researched
B
Ascorbic AcidGeneral health support
Research: Established essential nutrientEvidence strength: Established essential nutrient — extensively researched
B
Iron FumarateGeneral health support
Research: Established essential nutrientEvidence strength: Established essential nutrient — extensively researched

This summary describes only the ingredients and the research behind them — it is not a judgment of the product or its marketing. Grades reflect the weight of published evidence cross-referenced against 350M+ research papers. How we grade →

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