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 (good) with magnesium oxide (bad) and zinc oxide (bad). Costco chose the right calcium form but cheaped out on mag and zinc. 250 tablets at bulk pricing. Add separate mag glycinate.
4 ingredientsTablets250 servings
We'd recommend thisEvidence
6.0
Dosing
6.0
Synergy
6.0
Whensplit
Foodwith or without food
SafetySome cautions
ResearchStrong evidence
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
Best For
Costco bone health buyers.
Skip This If
People not adding K2 separately.
Time to Feel
DEXA at 12 months.
Value
GOOD
How to take: Daily.
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