For maintaining your vitamin D levels, this provides 1,000 IU of **Vitamin D3** (cholecalciferol) — the more effective D3 form that raises blood levels better than D2. At 1,000 IU, you're at the bottom of the 1,000–5,000 IU clinical range, which is enough for general maintenance if your levels aren't severely low.

One capsule daily with a meal is all it takes, and the 60-capsule count gives you a full two-month supply. Vitamin D3 is fat-soluble, so taking it alongside food that contains some fat will help your body absorb it.

If you've been tested and found to be deficient, 1,000 IU may not be enough to correct your levels quickly — most practitioners recommend 2,000–5,000 IU for repletion. This dose is better suited for ongoing maintenance once your levels are already in a healthy range.

BioStacks
Ostelin

Vitamin D3 1000IU

Capsule · 60 servings · $0.40/serving

78 / 100Good

Score Breakdown

Formulation
90
Safety
87
Final score
78/100

Ingredients (1)

Vitamin D1000 IU

Within effective range · Premium form

Label Nutrition Facts

Other Ingredients

Fillers, coatings, and additives

5Safe1Caution

Sodium MetabisulfitePreservative

Caution

Soy LecithinEmulsifier

Safe

GelatinCapsule

Safe

GlycerinHumectant

Safe

Purified WaterSolvent

Safe

Vegetable OilCarrier

Safe

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.