Product verdict
Kirkland Signature Calcium 600 mg with Vitamin D3
14 ingredients on the label. None of them reach an amount we’ve seen work for anything we track.
Nothing in here reaches an amount we’ve seen work.
That isn’t proof it does nothing — it’s the honest limit of what we can tell you.
Supplement Facts
Serving Size 1 Tablet(s)
Servings Per Container 250
† Daily Value not established, or not stated on this label.
Worth knowing about this bottle
Vitamin D3 with Calcium likely, not settled
The pairing is standard and works, but it is not free of risk: in the Women’s Health Initiative, women taking calcium with vitamin D had more kidney stones than those on placebo.
What to do: Worth knowing if you have had a kidney stone. Otherwise the pairing remains the standard one; do not stop it on the strength of this alone.
Vitamin D3 and Calcium work better together
Vitamin D significantly enhances calcium absorption in the intestine, improving bone health outcomes.
1 present in trace amounts
Far under everything studied. No trial speaks to what this much does.
- Supports frequent colds — dose is 80% short of the 2000–4000 IU tested.
- Supports slow recovery — dose is 80% short of the 2000–4000 IU tested.
- Some evidence for chronic fatigue — dose is 80% short of the 2000–4000 IU tested.
- Some evidence for hair thinning — dose is 80% short of the 2000–4000 IU tested.
- Some evidence for chronic inflammation — dose is 80% short of the 2000–4000 IU tested.
Label read from the NIH Dietary Supplement Label Database. Formulations change — check the panel on the bottle in your hand. Check a different product.