Kirkland Signature Calcium 600 mg + D3
Brand: Kirkland Signature · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that Kirkland Signature Calcium 600 mg + D3 is a straightforward supplement for supporting bone health, but you need to be careful with dosing and timing. Each tablet provides 600 mg of calcium, so you must account for dietary intake to avoid exceeding the recommended total of 1,000–1,200 mg per day [NIH ODS].
How it works
Calcium acts as a master regulator for your bones and muscles. It supports bone mineralization to keep your skeleton dense, and it also helps your nerves and muscles relax after contracting [NIH ODS]. Think of it as the raw material your body uses to keep your frame strong and your heart beating steadily.
Safety profile
FDA received 592,059 total adverse event reports across all supplement categories [FDA data]. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer. Too much calcium in your blood or urine can cause constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and poor kidney function [NIH ODS].
Our recommendation
Start with one tablet daily, taking it with food to improve absorption. Separate this supplement from medications like thyroid hormone, antibiotics, and bisphosphonates by at least 2 hours [NIH ODS]. If you already eat dairy or fortified foods, you may only need this every other day. Data not available on the exact vitamin D3 dose in this product, so check the label and aim for 600 IU total daily from all sources [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Kirkland Signature |
|---|---|
| Serving Size | |
| Contents | 500.0 Tablet(s) |
| Market Status | On Market |
How to Read This Label
Supplement labels contain several key sections regulated by the FDA:
- Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
- Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
- % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
- Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
- Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.
Source: FDA Dietary Supplement Labeling Guide