Kirkland Signature Magnesium Citrate 250 mg
Brand: Kirkland Signature · Form: SOFTGEL CAPSULE [E0161] On Market
Our assessment
The evidence shows that Kirkland Signature Magnesium Citrate 250 mg is a standard formulation for supporting key body functions. Based on the data provided for the active ingredient, calcium, this product is designed to support bone mineralization and neuromuscular relaxation [NIH ODS]. We recommend it for adults who need to supplement their dietary intake, but you must be aware of the specific safety and interaction guidelines detailed below.
How it works
Think of the minerals in this supplement as essential regulators. The data indicates that calcium supports bone mineralization, helping to build and maintain strong bone density. It also plays a role in neuromuscular relaxation, meaning it helps your muscles relax and supports proper nerve signaling throughout your body [NIH ODS].
Safety profile
Data not available for specific side effects of this product from the FDA data provided. The total number of adverse event reports across all supplements is 592,059 [FDA data]. For the mineral calcium, the data warns that high blood and urine levels 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]. You should not exceed the recommended dose.
Our recommendation
We recommend taking this supplement with food to improve absorption. However, be very careful: calcium can reduce the absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these medications, separate your doses by at least two hours. Also, some research suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Stick to the label dose and consult your doctor before starting.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Kirkland Signature |
|---|---|
| Serving Size | |
| Contents | 300.0 Softgel(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