**Vitamin D3** at 5,000 IU in one softgel sits at the very top of the clinically used 1,000–5,000 IU range — a full repletion-level dose for raising low blood levels and supporting bone and immune health. It's cholecalciferol, the form your body uses most efficiently, suspended in flaxseed oil so it absorbs well even without food.

This dose is built for a real gap — diagnosed deficiency, little sun exposure, or darker skin, where 5,000 IU a day actually moves your numbers. Because vitamin D pulls calcium into your body, many people pair a dose this high with vitamin K2 to steer that calcium toward bone rather than arteries.

One caveat: 5,000 IU is above the 4,000 IU daily upper limit, so this isn't a casual top-up. If your levels are already healthy, daily use can push you too high — the label rightly asks you to monitor your blood levels and check with a provider before long-term use.

BioStacks
Swanson

D3 5,000 IU Highest Potency

Capsule · 1 Softgel · 250 servings · $0.04/serving

iHerbAmazon

Best for

ImmuneDentalBone & Joint

Ingredients (1)

Vitamin D3

100%

Dose

5000 IU

Target

1000–5000 IU

Form

Premium

Other Ingredients (4)

Flaxseed OilCarrier Oil

Flaxseed (linseed) oil, an ALA omega-3 source used as a softgel carrier oil

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

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

Suggested use: As a dietary supplement, take one softgel per day with food and water.

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

Price Check

$9.99

$10$20

Cheaper than 80% of 632 vitamin D supplements

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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.

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