At 5,000 IU per softgel, this **Vitamin D3** sits at the top of the clinical range (1,000–5,000 IU) for raising healthy blood levels — a real repletion dose, not a token amount. It's cholecalciferol, the same form your skin makes from sunlight, in an oil-based softgel that absorbs best with a meal.

Once your levels are up, vitamin D supports bone strength, immune function, and dental health. To get the most from it, pair it with magnesium, which your body needs to convert vitamin D into its active form.

One caveat: 5,000 IU is above the 4,000 IU daily upper limit for long-term use. That's intentional — this is built to correct a deficiency under a provider's guidance, which is why the label warns against combining it with other vitamin D sources. If you're already at a healthy level, a lower daily dose is the safer everyday pick.

BioStacks
Nature Made

Extra Strength D3 125 mcg

Capsule · 1 Softgel · 180 servings

iHerbAmazon

Best for

ImmuneDentalBone & Joint

Ingredients (1)

Vitamin D3

100%

Dose

5000 IU

Target

1000–5000 IU

Form

Premium

Other Ingredients (5)

Corn OilEmollient

A refined vegetable oil from corn used as a carrier in softgels

GelatinCapsule

Protein derived from collagen, used in traditional capsule shells

GlycerinHumectant

Sweet-tasting liquid used in soft capsules and liquids

Vegetable OilCarrier

Edible oils used as carriers in softgels and as processing aids

Purified WaterSolvent

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

How to Take It

Take it anytime

Fat-soluble — take with your largest fat-containing meal. Time of day doesn't matter.

With a meal containing fat

On the label

Use daily to help raise vitamin D levels if deficient Suggested use: This is a high dose vitamin D product for those with higher vitamin D needs and/or deficiency, as determined by a healthcare professional. Consult with your healthcare professional before use. Take one softgel daily with a meal. For easier swallowing, take with water before and during ingestion.

General guidance based on the ingredients, not a substitute for the label or your doctor.

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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.

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