One A Day

4.8 (700 reviews)

Out of Stock

Ingredient Research

Vitamin B1
- Very lowImproved Left Ventricular Ejection Fraction3 studies
Vitamin B12
- LowReduced Vitamin B12 Level5 studies
Vitamin B6
- LowReduced Anxiety3 studies
Vitamin B9
- HighReduced Homocysteine Level6 studies
- ModerateIncreased Folate Level3 studies
Vitamin C
- HighReduced Pain7 studies
- ModerateReduced Interleukin-6 Levels6 studies
- ModerateReduced Systolic Blood Pressure4 studies
Vitamin D
- HighIncreased 25-hydroxyvitamin D Level14 studies
- HighReduced Parathyroid Hormone Level4 studies
- ModerateImproved Insulin Sensitivity9 studies
Vitamin E
- ModerateReduced Aspartate Aminotransferase Level5 studies
- ModerateReduced Alanine Aminotransferase Level4 studies
- ModerateReduced Pain3 studies
Calcium
- LowIncreased Total Hip Bone Mineral Density3 studies
- LowReduced Stillbirth3 studies
Iron
- ModerateIncreased Hemoglobin Levels5 studies
- ModerateReduced Iron Deficiency4 studies
- LowIncreased Ferritin Level4 studies
Magnesium
- LowReduced Depression Symptoms3 studies
- LowReduced C-Reactive Protein Levels3 studies
Selenium
- HighReduced Thyroid Peroxidase Antibody Level5 studies
- LowReduced Thyroglobulin Antibody Level4 studies
- LowIncreased Serum Free Thyroxine Levels3 studies
Zinc
- LowReduced Zinc Level3 studies

How this product's ingredient doses compare to doses studied in research.

Vitamin C90 mg
Studies used 12–1,200 mg/day (median 250) across 15 studies
Low end of studied doses
Vitamin E15 mg
Studies used 5–1,200 mg/day (median 300) across 10 studies
Low end of studied doses
Form mismatch: this product uses Alpha-Tocopherol. Most research support uses α-Te (1 study).
Vitamin B12.4 mg
Studies used 0–1,200 mg/day (median 100) across 8 studies
Low end of studied doses
Vitamin B21.95 mg
Studies used 20–1,200 mg/day (median 100) across 5 studies
Below studied range
Vitamin B324 mg
Studies used 100–3,000 mg/day (median 714) across 9 studies
Below studied range
Vitamin B63.4 mg
Studies used 19–1,200 mg/day (median 80) across 6 studies
Below studied range
Vitamin B745 mcg
Studies used 10,000 mcg/day (median 10,000) across 1 study
Below studied range
Calcium130 mg
Studies used 500–1,000 mg/day (median 750) across 4 studies
Below studied range
Form mismatch: this product uses Carbonate. Most research support uses Calcium Carbonate (1 study).
Iron18 mg
Studies used 4.2–105 mg/day (median 24.85) across 4 studies
In typical studied range
Form mismatch: this product uses Ferrous Fumarate. Most research support uses Elemental Iron (1 study).
Magnesium42 mg
Studies used 80–637 mg/day (median 250) across 7 studies
Below studied range
Zinc8 mg
Studies used 10–100 mg/day (median 55) across 2 studies
Below studied range

Ingredient pairs in this product that have synthesised research evidence together.

Low evidenceVitamin E + Vitamin Cfor Reduced Pain· 3 studies
Across 3 studies, all reported beneficial effects of the Vitamin E and Vitamin C combination on pain reduction, with effect sizes ranging from small to moderate and all findings statistically significant. Compared to Vitamin C alone (moderate evidence, small effect), the combination shows a similar directional benefit but the limited number of studies precludes a definitive comparison. The median study duration was 60 days (reported in 1 of 3 studies). No form data were reported for either substance.

Boosts immune system health with Vitamin C and zinc.
Supports bone health through Vitamin D and calcium.
Enhances skin and eye health with Vitamin A.
Promotes energy production and metabolism with B-Vitamins (thiamin, riboflavin, niacin, B6, B12, biotin, pantothenic acid).
Aids in red blood cell formation and oxygen transport due to iron and folate.
Provides antioxidant support from Vitamins C and E.
Supports thyroid function with iodine and selenium.
Maintains strong and healthy cells with copper and magnesium.
Convenient One-A-Day format for ease of use.
Contains no artificial flavors, ensuring a more natural supplement choice.