Douglas Laboratories Fiber-Plex
Brand: Douglas Laboratories · Form: CAPSULE [E0159]
Our assessment
The evidence shows that Fiber-Plex from Douglas Laboratories is a calcium supplement, not a fiber product. Your main concern should be getting the right amount of calcium — not too little, not too much. The data confirms that calcium supports bone mineralization and neuromuscular relaxation, but high intakes carry real risks [NIH ODS].
How it works
Think of calcium as a building block for your bones and a signal regulator for your nerves and muscles. It directly supports bone density and mineral deposition, and helps your muscles relax after contracting. It also plays a key role in nerve signaling throughout your body [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 your 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] [FDA data]. Calcium can also reduce the absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Only take this supplement if you know you need additional calcium beyond what you get from food. Check with your doctor about your total daily intake from all sources — diet plus supplements. If you take thyroid medication, antibiotics, or osteoporosis drugs, separate your calcium dose by at least two hours [NIH ODS]. Data not available for a specific recommended dose for this product.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Douglas Laboratories |
|---|---|
| Serving Size | |
| Contents | 120.0 Capsule(s) |
| Market Status | Off 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