Kirkland Signature Calcium Citrate With 500 mg Of Calcium
Brand: Kirkland Signature · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that Kirkland Signature Calcium Citrate provides 500 mg of calcium per serving, which is a significant portion of the daily recommended intake for most adults. Calcium is essential for bone mineralization and neuromuscular function [NIH ODS]. However, we need to be careful with total intake from all sources, as some research suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS].
How it works
Think of calcium as a building block for your skeleton. It supports bone density and mineral deposition, and it also plays a key role in muscle relaxation and nerve signaling [NIH ODS]. The citrate form in this supplement is often better absorbed than other forms, especially if you take it with or without food.
Safety profile
FDA received 592,059 adverse event reports across all products. For calcium specifically, high levels in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Additionally, calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start by assessing your total daily calcium intake from food and other supplements. A single serving of this product provides 500 mg. Be aware of the potential medication interactions listed above and take calcium at least two hours apart from those medications. If you have a history of kidney stones or heart disease, consult your doctor before starting. Data on specific side effect counts for this exact product is not available [FDA data].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Kirkland Signature |
|---|---|
| Serving Size | |
| Contents | 300.0 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