Sundown Naturals Fiber With Vitamin D3
Brand: Sundown Naturals · Form: GUMMY [E0176]
Our assessment
The evidence shows that the key active ingredient in this product is Calcium, not Vitamin D3 as the name might suggest. Our assessment: This supplement is primarily a calcium source with a modest amount of Vitamin D3. For most adults, calcium from food is preferred, but this product can help you meet your needs if your diet is low in dairy or fortified foods [NIH ODS].
How it works
Think of calcium as a structural builder for your bones. It supports bone mineralization and density, and it also plays a role in neuromuscular relaxation and nerve signaling [NIH ODS]. Vitamin D3 is added to help your body absorb this calcium more effectively. If you are taking this to support bone health, you need both ingredients working together.
Safety profile
FDA has received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer. Too much calcium can cause constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start by assessing your dietary calcium intake. Most adults need 1,000–1,200 mg per day from all sources. Do not exceed the Tolerable Upper Intake Level without medical supervision. Take this supplement with food and separate it from the medications listed above by at least 2 hours. If you have a history of kidney stones, heart disease, or prostate cancer, consult your doctor before starting [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Sundown Naturals |
|---|---|
| Serving Size | |
| Contents | 50.0 Gummie(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