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

1 Capsule · 60 servings

iHerbAmazon
Track this supplement · Get started free

What it does

Vitamin D

vitamin d3Premium

Cholecalciferol (vitamin d3): Supports normal bones; D3 generally raises vitamin D blood levels more than comparable D2 doses.

ImmuneDentalBone & Joint
Ask AI about this product

Ingredients (1)

Other ingredients

Sodium MetabisulfitePreservative

Sulfite sensitivity affects ~1% of the general population and up to 5% of asthmatics. Can trigger bronchospasm, hives, and anaphylaxis in sensitive individuals. FDA requires labeling when sulfites exceed 10 ppm.

Soy LecithinEmulsifier

Widely used emulsifier derived from soybeans

GelatinCapsule

Protein derived from collagen, used in traditional capsule shells

GlycerinHumectant

Sweet-tasting liquid used in soft capsules and liquids

Purified WaterSolvent

Water meeting USP specifications used as solvent/vehicle in gummies and liquids

Vegetable OilCarrier

Edible oils used as carriers in softgels and as processing aids

Lab testing

How to take it

With a meal containing fat

On the label

Adults: Take 1 capsule daily with a meal, or as directed by your healthcare professional.

Price check

$24.00

$10$20

Pricier than 75% of 552 vitamin D supplements

Similar products

D3000 Vitamin D Daily Oral Spray

BetterYou

D3000 Vitamin D Daily Oral Spray

🛡️ for Immune

95
D400 Infant Vitamin D Daily Oral Spray

BetterYou

D400 Infant Vitamin D Daily Oral Spray

🛡️ for Immune

95
Vitamin D3 3000 IU

Zahler

Vitamin D3 3000 IU

🛡️ for Immune

95
Vitamin D3 2500 IU (62.5 mcg)

Carlson

Vitamin D3 2500 IU (62.5 mcg)

🛡️ for Immune

94
Vitamin D3 62.5 mcg 2,500 IU

Country Life

Vitamin D3 62.5 mcg 2,500 IU

🛡️ for Immune

94

Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the 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. studied 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.

Not medical advice. Consult your healthcare professional.

BioStacks

Know exactly what's in your supplements.

Navigate

  • Home
  • Manifesto
  • App Store
  • Google Play

Resources

  • Contact & Support
  • Pricing
  • Terms of Service
  • Privacy Policy
  • Refund Policy

Explore

  • Health Areas
  • Best Supplements
  • Nutrients
  • All Supplements

Popular Picks

  • Best Magnesium for Sleep
  • Best Collagen for Skin
  • Best Creatine for Muscle
  • Best Vitamin D for Bone Health
  • Best Probiotics for Digestion
  • Best CoQ10 for Heart

Free Tools

  • Interaction Checker
  • Dose Checker
  • Form Comparison

Field Guides

  • Magnesium for sleep
  • Reading labels
  • Interaction checker
  • Dose checker
  • Harmful ingredients
  • Proprietary blends
  • Stack building
  • Scan without barcode
  • All guides →
© 2026 BioStacks. All rights reserved. Not medical advice.