D3 25 mcg (1000 IU)
Product Analysis
Transparency Excellent
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Vitamin D3 (as Cholecalciferol) | 25 mcg | 130% |
| Calcium (as Calcium Carbonate) | 90 mg | 6% |
Bioavailability Very Good
Absorption Rating
- Vitamin D3 (as Cholecalciferol) Good
- Calcium (as Calcium Carbonate) Fair
Other Ingredients Excellent
Fillers & Additives
- Cellulose
- Croscarmellose Sodium
- Maltodextrin
- Stearic Acid
- Contains Less Than 2% of
Efficacy Fair
Dosage Analysis
- Vitamin D3 (as Cholecalciferol) 25 mcg Effective
- Calcium (as Calcium Carbonate) 90 mg Under-dosed
Supplement Facts
| Ingredient | Amount | % Daily Value |
|---|---|---|
| Vitamin D3 (as Cholecalciferol) | 25 mcg | 130% |
| Calcium (as Calcium Carbonate) | 90 mg | 6% |
Other Ingredients
Price Comparison
Price History
Tracked across major retailers. Updated periodically.
Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.
Is 21st Century D3 25 mcg (1000 IU) a good supplement?
21st Century D3 25 mcg (1000 IU) received a product quality score of 81/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 2 active ingredients Of the 5 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, 21st Century, holds a brand trust score of 76/100 with 2 verified certifications including Consumerlab, Nsf Gmp.
What are the ingredients in 21st Century D3 25 mcg (1000 IU)?
21st Century D3 25 mcg (1000 IU) contains 2 active ingredients: Vitamin D3 (as Cholecalciferol) (25 mcg), Calcium (as Calcium Carbonate) (90 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.
Is 21st Century D3 25 mcg (1000 IU) safe to take?
21st Century D3 25 mcg (1000 IU) has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.
Is 21st Century a trustworthy supplement brand?
21st Century receives a brand trust score of 76/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1991 and headquartered in Tempe, Arizona, United States, the company offers 231 products in their lineup. They hold 2 verified certifications including Consumerlab, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: 21st Century has 4 historical regulatory incidents on record, which are factored into the trust score.
Scan Any Supplement Instantly
Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.