D3 25 mcg (1000 IU)
This 21st Century D3 supplement is a single vitamin and mineral product designed to provide Vitamin D3 and Calcium. It contains 25 mcg (1000 IU) of Vitamin D3 and 90 mg of Calcium per tablet. The product received an N+ Score of 38, earning an 'F' grade, indicating a poor overall quality assessment. Both Vitamin D3 and Calcium are identified as underdosed in this formulation, suggesting they do not meet clinically studied dosages for typical benefits. With only two ingredients and a 100% label transparency, its primary weakness lies in ingredient adequacy. This product might be considered by individuals seeking a very basic, low-dose Vitamin D3 and Calcium supplement, though higher dosages are often recommended for significant support.
About This Product
D3 25 mcg (1000 IU) by 21st Century is a joint & bone supplement containing 2 active ingredients. It has earned an N+ Score of 38/100 (Grade F).
N+ Score Breakdown
Are key ingredients present at clinically effective doses based on research?
Does the product include all expected ingredients for its supplement category?
Are individual ingredient amounts clearly disclosed without proprietary blends?
Does the formula include a breadth of beneficial compounds from multiple pathways?
Strengths
- +Fully transparent label with individual ingredient amounts disclosed
Weaknesses
- −Several ingredients below clinically effective doses
- −Missing several expected ingredients for its category
Ingredient Analysis (2 ingredients)
| Ingredient | Amount | Dose Adequacy |
|---|---|---|
| Calcium | 90.000 mg | Under |
| Vitamin D3 | 25.000 mcg | Under |
Clinical ranges based on NIH ODS Fact Sheets and peer-reviewed research. Status indicates whether the amount meets evidence-based thresholds.