Energy
99/100
This product looks safe
- Niacin: 40mg is 1.1× the Tolerable Upper Intake Level (35mg)
- 66% of ingredients have research evidence
C
Label Compliance Grade
Product Label
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Safety Alerts
⚠️ Niacin: 40mg is 1.1× the Tolerable Upper Intake Level (35mg)
Label Data
1 Tablet(s)
Serving Size
Other Combinations
Product Type
66%
Evidence Coverage
Supplement Facts — Evidence Check
Vitamin A
3500 IU
(70% DV)
Vitamin C
60 mg
(100% DV)
400 IU
(100% DV)
✅ Within RDA (0.7× RDA of 0.015 mg)
📚 604 studies (Tier A: 16, B: 251)
22.5 IU
(75% DV)
✅ Within RDA (1.0× RDA of 15 mg)
📚 177 studies (Tier A: 3, B: 90)
25 mcg
(31% DV)
✅ Within RDA (0.2× RDA of 0.12 mg)
📚 273 studies (Tier A: 9, B: 175)
3 mg
(200% DV)
✅ 2.5× RDA — within safe limits
📚 76 studies (Tier A: 0, B: 33)
3.4 mg
(200% DV)
✅ 2.6× RDA — within safe limits
📚 12 studies (Tier A: 0, B: 1)
40 mg
(200% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 1.1× (UL: 35 mg)
📚 193 studies (Tier A: 5, B: 63)
4 mg
(200% DV)
📊 3.1× RDA — above typical dose (UL: 100 mg)
📚 113 studies (Tier A: 3, B: 35)
400 mcg
(100% DV)
✅ Within RDA (1.0× RDA of 0.4 mg)
📚 225 studies (Tier A: 10, B: 105)
12 mcg
(200% DV)
📊 5.0× RDA — above typical dose
📚 138 studies (Tier A: 1, B: 44)
300 mcg
(100% DV)
📊 10.0× RDA — above typical dose
📚 26 studies (Tier A: 0, B: 11)
10 mg
(100% DV)
✅ 2.0× RDA — within safe limits
📚 1 studies — no high-quality reviews
Calcium
250 mg
(25% DV)
Iron
9 mg
(50% DV)
150 mcg
(100% DV)
✅ Within RDA (1.0× RDA of 0.15 mg)
📚 243 studies (Tier A: 4, B: 133)
40 mg
(10% DV)
📊 Market median: 4002.0mg (1 products)
📚 20 studies (Tier A: 0, B: 2)
15 mg
(100% DV)
✅ 1.4× RDA — within safe limits
📚 258 studies (Tier A: 6, B: 134)
45 mcg
(64% DV)
✅ Within RDA (0.8× RDA of 0.055 mg)
📚 172 studies (Tier A: 0, B: 67)
2 mg
(100% DV)
✅ 2.2× RDA — within safe limits
📚 36 studies (Tier A: 0, B: 11)
2 mg
(100% DV)
✅ Within RDA (0.9× RDA of 2.3 mg)
📚 8 studies — no high-quality reviews
100 mcg
(83% DV)
✅ 2.9× RDA — within safe limits
📚 197 studies (Tier A: 1, B: 55)
25 mcg
(33% DV)
✅ Within RDA (0.6× RDA of 0.045 mg)
📚 2 studies — no high-quality reviews
99.3 mg
(3% DV)
📊 Market median: 4002.0mg (1 products)
📚 20 studies (Tier A: 0, B: 2)
Potassium
99 mg
(3% DV)
Nickel
5 mcg
Tin
10 mcg
5 mg
📊 Market median: 108.0mg (8 products)
📚 9 studies (Tier A: 0, B: 4)
90 mg
📊 Market median: 180.0mg (239 products)
📚 43 studies (Tier A: 1, B: 19)
Other Ingredients
Calcium Carbonate
Potassium Chloride
Microcrystaline Cellulose
Guarana seed powder
Caffeine
Magnesium Oxide
Ascorbic Acid
Niacinamide
Less than 2% of
Label Claims — Verification
❓
Nutrient
❓
All Other
❓
Structure/Function
All Other (99% of products)
Structure/Function (76% of products)
Nutrient (58% of products)
Target Groups
Adult (18 - 50 Years)
Product Information
📋 Directions for Use
Directions: Adults: One tablet daily, with food.
⚠️ Warnings & Precautions
Warning: Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children. In case of accidental overdose, call a doctor or Poison Control Center immediately.
If pregnant or breast-feeding, ask a health professional before use.
Keep out of reach of children Child resistant cap
🧪 Formulation Notes
An active lifestyle may need energy support. One A Day Energy can help. It's designed with B-Vitamins which help convert food to energy, and caffeine to help support mental alertness.
This product contains about as much caffeine as a cup of coffee (90 mg).
Additional Information
Questions or comments? Please call 1-800-800-4793 (Mon-Fri 9AM - 5 PM EST)
Product Details
DSLD Entry Date
2020-11-21
Product Type
Other Combinations
Form
Tablet or Pill
Brand
Bayer One A Day
DSLD ID
239417
Data Updated
2026-04-11
Research Evidence
337
Research Sources
54
Avg Quality Score
161
Meta Analysis
68
Systematic Review
51
Rct
48
Clinical Trial
2
Other
2
Regulatory Source
1
Narrative Review
1
Cochrane Review
1
Guideline
1
Openfda Safety
A
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A
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Food fortification with multiple micronutrients: impact on health outcomes in general population
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