Product Label

Douglas Laboratories Fiber-Plex

Brand: Douglas Laboratories · Form: CAPSULE [E0159]

Our assessment

Our assessment: Fiber-Plex from Douglas Laboratories is a fiber supplement, but the only ingredient data we have is for calcium. The evidence shows that calcium is essential for bone health and nerve function, but it is not a primary fiber source [NIH ODS]. This means you should not rely on this product as your main fiber supplement.

How it works

Think of calcium as a structural support for your skeleton and a signal regulator for your nerves and muscles. It supports bone mineralization and density, and it helps your muscles relax and your nerves send signals properly [NIH ODS].

Safety profile

Safety profile: FDA has received 592,059 total adverse event reports across all supplements, but specific report counts for Fiber-Plex or its calcium content are not available. High calcium intakes might increase the risk of heart disease and prostate cancer. Very high levels can cause poor muscle tone, poor kidney function, constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS] [FDA data].

Our recommendation

Our recommendation: Data not available for the fiber content of this specific product. For calcium, if you need a supplement, take it with food and separate it from medications like thyroid hormone or antibiotics by at least 2 hours [NIH ODS]. Consult your healthcare provider before starting, especially if you have kidney issues or a history of heart disease.

AI-assisted analysis. Data sourced from NIH DSLD.

Supplement Facts

BrandDouglas Laboratories
Serving Size
Contents120.0 Capsule(s)
Market StatusOff 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

Original Label

View Full DSLD Label (PDF)

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