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, 2026

A 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.

FieldWhat to record
FormD2, D3, or the exact wording shown.
AmountIU, micrograms, or both as printed.
ServingUnits per serving and total servings.
PackageFormat 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.

ProductMerchantPriceNormalized metrics
Windmill, Vitamin D3, 250 Mcg, 100 SoftgelsWindmillUniversal Herbs Inc€9.11Package price only
Windmill, Vitamin D3, 125 Mcg, 100 SoftgelsWindmillUniversal Herbs Inc€8.40Package price only
Caltrate, Bone Health Advanced 600 Plus Vitamin D3 Minerals, 60 TabletsCaltrateUniversal Herbs Inc€9.07Package price only
Basic Drugs, Vitamins Natural Vitamin D3, 5000 IU, 200 TabsBasic DrugsUniversal Herbs Inc€17.11Package price only
Vitadrops, Vitamin D Jellybeans, 90 CountVitadropsUniversal Herbs Inc€15.77Package price only