Calcium 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.
The set is generated, never written by the brand.
Kirkland Signature Calcium Citrate Magnesium Zinc with D3: a solid everyday formula. Lead: Calcium at 500 mg. Calcium citrate at 500mg (good form, at minimum effective dose) paired with D3 at 800 IU (below optimal 4000 IU). The primary is covered; some supporting doses sit below the studied amounts.
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.
4 of 4 shown, 1 dose at what the trials used
This read comes from the product's own supplement facts panel. Every dose was cross-referenced with published clinical trials to see whether it matches what the studies actually used.
