SPECIMEN #KIRKLAND
Verified
MineralsKirkland Signature
Calcium Citrate Magnesium Zinc with D3
Calcium citrate (good choice) with magnesium oxide and zinc oxide (cheap choices). Costco got the headline ingredient right and cheaped out on the supporting cast. 250 tablets though. Add separate magnesium glycinate and K2.
6.5/10
GOODCalcium citrate at 500mg (good form, at minimum effective dose) paired with D3 at 800 IU (below optimal 4000 IU). But magnesium oxide at only 80mg with 4% absorption is practically useless. Zinc oxide at 10mg is adequate but poorly absorbed. Right calcium form, wrong everything else.
4 ingredientsTablets250 servings
Evidence
7.0
Dosing
3.9
Synergy
6.0
What We Like
- Calcium citrate absorbs without stomach acid.
- 500mg per dose doesn't exceed absorption max.
- D3 included for calcium absorption.
- 250 tablets at Costco pricing.
Watch Out For
- Magnesium oxide at 80mg delivers ~3mg.
- Zinc oxide poorly absorbed.
- No vitamin K2 for calcium direction.
What We Analyzed
Verified Supplement Facts
Every dose checked against clinical research
We analyzed the actual supplement facts panel for this product. Every ingredient dose below was cross-referenced with published clinical trials to determine if it matches what studies actually use.
4 ingredients analyzed3 underdosed
Source: Official product page
Ingredient Breakdown
1 adequate3 underdosed
Clinical Adequate Underdosed Overdosed|Bar = % of clinical dose
IngredientDoseStatusvs. Clinical
In our database (click to learn more) Not yet reviewed
Our Analysis
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