| Ingredient | Amount | % DV% Daily Value — how much of the recommended daily intake one serving provides, based on a 2,000 calorie diet. 100% = full daily need. Values over 100% are common for water-soluble vitamins (B, C) and generally safe. Values over 200% are highlighted. |
|---|---|---|
| Vitamin A | 2500 IU | 50% |
| Vitamin C | 60 mg | 100% |
| Vitamin D | 400 IU | 100% |
| Vitamin E | 30 IU | 100% |
| Vitamin K | 80 mcg | 100% |
| Thiamine | 1.9 mg | 127% |
| Riboflavin | 2.1 mg | 125% |
| Niacin | 25 mg | 125% |
| Vitamin B6 | 2.5 mg | 125% |
| Folic Acid | 400 mcg | 100% |
| Vitamin B12 | 7.5 mcg | 125% |
| Pantothenic Acid | 12.5 mg | 125% |
| Calcium | 200 mg | 20% |
| Iron | 18 mg | 100% |
| Magnesium | 50 mg | 13% |
| Zinc | 15 mg | 100% |
| Selenium | 70 mcg | 100% |
| Copper | 2 mg | 100% |
| Manganese | 2 mg | 100% |
| Chromium | 200 mcg | 167% |
| Guarana Blend | 180 mg | — |
| Green Tea/Cayenne Blend | 10 mg | — |
Other ingredients: Calcium Carbonate, Cellulose, Guarana seed powder, Magnesium Oxide, Caffeine, Ascorbic Acid, Ferrous Fumarate, Corn Starch, Sodium Starch Glycolate, DL-Alpha-Tocopheryl Acetate, Niacinamide, Acacia, Croscarmellose Sodium, Zinc Oxide, Dicalcium Phosphate, Calcium D-Pantothenate, Dextrin, Maltodextrin, Silicon Dioxide, Hypromellose, Magnesium Stearate, Titanium Dioxide, Glucose, Crospovidone, Green Tea powder, Gelatin, Manganese Sulfate, Cayenne Pepper powder, Cupric Sulfate, Polyethylene Glycol, Guarana seed extract, Pyridoxine Hydrochloride, Riboflavin, Dextrose, Thiamine Mononitrate, Soy Lecithin, Chromium Chloride, Resin, Vitamin A Acetate, Folic Acid, Beta-Carotene, FD&C Blue #1 Lake, Sodium Selenate, Phytonadione, Tricalcium Phosphate, Cholecalciferol, Cyanocobalamin
This score evaluates label quality — dosage disclosure, transparency, cleanliness of inactive ingredients, and formula composition. It does not measure clinical efficacy, bioavailability, or third-party testing. Read full methodology
Same category, higher SupplementScore. Based on dosage transparency, label cleanliness, and formula quality.
The research summaries below are about the ingredients in general, drawn from published studies that often use different doses, forms, and populations than this product. A "strong" evidence rating for an ingredient does not mean this product will produce that effect — studied doses may be significantly higher or lower than what is contained here. Always verify doses against the Supplement Facts table above.
Essential for rhodopsin production in the retina. Deficiency causes night blindness — one of the earliest recognized nutritional deficiencies.
Critical role in maintaining mucosal barriers and immune cell function.
Zinc is a cofactor for over 300 enzymes involved in immune cell development and function. Supplementation may reduce duration of common cold symptoms, particularly as lozenges. Essential for maintaining immune barrier integrity.
Essential for skin integrity and wound repair processes.
Primary structural component of bones. Adequate lifelong intake, combined with vitamin D, helps prevent osteoporosis — supported by extensive clinical evidence.
Essential for muscle contraction through calcium signaling.
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All scores are algorithmically generated from publicly available label data (NIH Dietary Supplement Label Database) and reflect label quality — not clinical efficacy, safety, or product quality. This page is not affiliated with or endorsed by Bayer One A Day. If you represent this brand and believe any information is inaccurate, please contact us for a correction. Read full methodology
Alternatives are selected from the same category (Vitamin C) with a higher overall score. This is not a recommendation — always verify ingredients and dosages match your needs.
May improve sleep quality, especially in older adults and those with low magnesium status.
60% of body magnesium is stored in bone. Essential for bone mineralization.
May reduce muscle cramps and support post-exercise recovery.
Essential for red blood cell formation. Deficiency causes megaloblastic anemia, confirmed by decades of clinical evidence.
Involved in myelin synthesis and nerve function. Adequate B12 status supports neurological health, particularly in older adults and vegans.
Cofactor in energy production pathways, but supplementation only helps if deficient.
Involved in neurotransmitter synthesis including serotonin and dopamine. Cofactor for over 100 enzyme reactions.
B6 is a cofactor in the transsulfuration pathway, converting homocysteine to cysteine. This is a separate pathway from the B12/folate remethylation route.
Supports immune cell function. Regular supplementation may modestly reduce cold duration, but does not prevent colds.
Potent water-soluble antioxidant that protects cells from oxidative damage.
Essential cofactor for enzymes involved in collagen production.
Protects polyunsaturated fatty acids in cell membranes from oxidation.
May help protect skin from UV damage when combined with vitamin C.
At 400mg/day (far above RDA of 1.3mg), riboflavin may reduce migraine frequency. Effect is dose-dependent and not expected at typical supplement doses.
At pharmacological doses (1500-3000mg), niacin may improve HDL cholesterol. This effect is dose-dependent and not expected at typical supplement doses.
Essential coenzyme (NAD/NADP) in hundreds of metabolic reactions.
Iron supplementation is used to address iron deficiency. Should be taken under medical supervision as excess iron can be harmful.
Iron is essential for oxygen transport and cellular energy production.
Essential for calcium absorption. Deficiency leads to rickets in children and osteomalacia in adults — a well-established causal relationship.
May reduce risk of respiratory infections. Active area of research.
Some association between low vitamin D levels and depression, but evidence is inconsistent.
Essential cofactor for pyruvate dehydrogenase and other enzymes in carbohydrate metabolism.
Adequate folate intake before and during early pregnancy reduces risk of neural tube defects. This is one of the most well-established findings in nutrition.
Essential cofactor for nucleotide synthesis and cell division.
Adequate folate intake before and during early pregnancy reduces risk of neural tube defects. This is one of the most well-established findings in nutrition.
Essential cofactor for nucleotide synthesis and cell division.
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