You're getting 1,000mg of **Calcium** as calcium citrate — a well-absorbed form that doesn't require stomach acid to work. That's a full day's RDA in one serving, which is generous, but your body can only absorb about 500mg of calcium at a time. To get the most out of this, you'd want to split the 5-tablet serving across two meals rather than taking them all at once.

**Magnesium** is dosed at 500mg, which covers the full clinical supplemental range (100–400mg). However, the form is a mix of magnesium citrate and magnesium oxide — citrate absorbs well, but oxide has roughly 4% absorption, so you're not getting the full 500mg worth of usable magnesium. Worth noting: 500mg exceeds the tolerable upper limit of 350mg for supplemental magnesium, which may cause digestive discomfort for some people.

The biggest gap here is the absence of **Vitamin D** and **Vitamin K2**. Without vitamin D, your body absorbs only 10–15% of the calcium in this product. If you're taking this for bone support, pairing it with a separate D3+K2 supplement is essential to get real benefit from the calcium dose.

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BioStacks

Solgar

Calcium Magnesium Citrate

Tablet · 20 servings · $0.59/serving

63 / 100Good

Score Breakdown

Formulation
79
Safety
82
Final score
63/100

Ingredients (2)

Calcium1000 mg

Optimal dose · Premium form

Magnesium500 mg

Above upper limit · Budget form

Label Nutrition Facts

Active Ingredients

From the label · % Daily Value

DV%

Calcium1000 mg

100%

Magnesium500 mg

250%

Other Ingredients

Fillers, coatings, and additives

6Safe

Silicon DioxideAnti-caking

Safe

Magnesium StearateLubricant

Safe

Microcrystalline CelluloseBinder

Safe

Stearic AcidLubricant

Safe

Microcrystalline CelluloseBinder

Safe

GlycerinHumectant

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.