You're getting 1,000mg of **Calcium** in the citrate form, which absorbs well and doesn't require stomach acid — so you can take it with or without food. That's a full day's RDA in one serving, well above the typical 200–600mg supplemental range. The directions suggest splitting your four tablets throughout the day, and that matters: your body absorbs calcium much less efficiently above 500mg at once, so two tablets twice daily will deliver significantly more benefit than all four together.

The included **Vitamin D3** helps your body actually absorb the calcium — without adequate D, you'd only take in about 10–15% of what's in the tablets. However, the dose is just 600 IU (the RDA), which falls short of the 1,000–5,000 IU range that clinical research supports for maintaining healthy blood levels. If you're relying on this as your only vitamin D source, you'd benefit from a separate supplement to bring your total closer to 2,000–5,000 IU daily.

The four-tablet serving size is worth considering. That's 120 tablets for a 30-day supply, and each tablet is a standard Solgar pressed tablet — if pill burden is a concern, this could feel like a lot alongside other daily supplements.

BioStacks
Solgar

Calcium Citrate with Vitamin D3

4 Tablets · 30 servings · $0.41/serving

iHerbAmazon

Best for

DentalBone & Joint

Ingredients (2)

Calcium

100%

Dose

1000 mg

Target

200–600 mg

Form

Premium

Vitamin D3

60%

Dose

600 IU

Target

1000–5000 IU

Form

Premium

Other Ingredients (5)

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Magnesium StearateLubricant

A salt of stearic acid used as a lubricant in tablet and capsule production

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

GlycerinHumectant

Sweet-tasting liquid used in soft capsules and liquids

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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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