Kirkland Signature Fiber Capsules
Brand: Kirkland Signature · Form: CAPSULE [E0159] On Market
Our assessment
The evidence shows that Kirkland Signature Fiber Capsules provide a source of dietary fiber. However, the specific ingredient in this product is not listed in the data provided. Based on the available data for calcium, which is a common mineral, our assessment is that you should verify the active ingredient on the label before use.
How it works
Fiber supplements generally work by adding bulk to your stool, which helps promote regular bowel movements and supports digestive health. For calcium, a related mineral in the data, it functions as a master regulator for bone mineralization and neuromuscular relaxation [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports across all supplements. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer. 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]. Calcium can also reduce the absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Data not available for the specific ingredient in this product. Check the label to identify the active fiber ingredient. If it contains calcium, take it separately from medications like thyroid hormone or antibiotics [NIH ODS]. Start with the lowest dose on the label and drink plenty of water.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Kirkland Signature |
|---|---|
| Serving Size | |
| Contents | 360.0 Capsule(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