BioStacks
Kirkland Signature

Calcium Citrate Magnesium and Zinc

2 Tablets · 250 servings

iHerbAmazon

Best for

General HealthDentalBone & Joint

Ingredients (8)

Vitamin B6

100%

Dose

10 mg

Target

1.3–25 mg

Form

—

Vitamin D3

80%

Dose

800 IU

Target

1000–5000 IU

Form

Premium

Calcium

100%

Dose

500 mg

Target

200–600 mg

Form

Not listed

Copper

100%

Dose

1000 mcg

Target

1000–2000 mcg

Form

Not listed

Zinc

67%

Dose

10 mg

Target

15–30 mg

Form

Not listed

Other Ingredients (13)

Magnesium OxideMineral Source

An inorganic magnesium salt used as a magnesium source or bulking mineral.

Magnesium StearateLubricant

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

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

GlycineAmino Acid

Non-essential amino acid; smallest of the 20 proteinogenic amino acids. Mildly sweet taste — sometimes used as a low-glycemic flavor modifier in addition to its bioactive role

Calcium CarbonateBuffer

Common calcium salt used as a buffering agent, filler, or mineral fortification in supplements

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

CholecalciferolVitamin

Vitamin D3 added in trace amounts for fortification in protein powders and other supplements

How to Take It

Best taken in the morning

The Vitamin B6 in it is what pulls this toward the morning. Take it with a meal containing fat — the vitamin D in it absorbs poorly without one.

With a meal containing fat
Keep it away from high-oxalate foods like spinach
Space it a couple of hours from Iron

On the label

Suggested Use: Take two (2) tablets daily, preferably with a meal.

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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