Guides & Comparisons / Vitamin D guides
How to Compare Vitamin D Supplements: IU, mcg, and Serving Size
A label-first guide to comparing Vitamin D form, printed units, servings, and package price.By Suppscan Editorial Team · Last checked September 22, 2026A label-first guide to comparing Vitamin D form, printed units, servings, and package price.
Keep the printed unit beside the amount
Record whether the label shows IU, micrograms, or both. Keep the unit visible until a conversion is explicitly supported; do not compare a bare number without its unit.
| Field | What to record |
|---|---|
| Form | D2, D3, or the exact wording shown. |
| Amount | IU, micrograms, or both as printed. |
| Serving | Units per serving and total servings. |
| Package | Format and verified price. |
Normalize only with a clear rule
If both labels provide compatible units, show the conversion rule. If not, compare price per stated serving and keep the unit difference visible.
Separate carrier ingredients and claims
Oils, flavors, and front-label language are product details, not a substitute for the Vitamin D line. Missing amounts stay unknown.
Use current SuppScan data
SuppScan presents the product data available in its catalog and does not manufacture missing values. Open the Vitamin D comparison to review current offers and normalized metrics.
Current products tracked by SuppScan
Live catalog snapshot: package prices and disclosed metrics currently available for this category. Missing metrics stay blank.
| Product | Merchant | Price | Normalized metrics |
|---|---|---|---|
| Windmill, Vitamin D3, 250 Mcg, 100 SoftgelsWindmill | Universal Herbs Inc | €9.11 | Package price only |
| Windmill, Vitamin D3, 125 Mcg, 100 SoftgelsWindmill | Universal Herbs Inc | €8.40 | Package price only |
| Caltrate, Bone Health Advanced 600 Plus Vitamin D3 Minerals, 60 TabletsCaltrate | Universal Herbs Inc | €9.07 | Package price only |
| Basic Drugs, Vitamins Natural Vitamin D3, 5000 IU, 200 TabsBasic Drugs | Universal Herbs Inc | €17.11 | Package price only |
| Vitadrops, Vitamin D Jellybeans, 90 CountVitadrops | Universal Herbs Inc | €15.77 | Package price only |