Kirkland Signature Vitamin D3 2000 IU
Brand: Kirkland Signature · Form: SOFTGEL CAPSULE [E0161]
Our assessment
The evidence shows that Kirkland Signature Vitamin D3 2000 IU is a standard supplement for supporting bone health. However, the data we have is primarily for calcium, not vitamin D itself. For calcium, our assessment is that it plays a critical role in bone mineralization and muscle function [NIH ODS].
How it works
Think of calcium as a building block for your bones and a signal messenger for your nerves. It supports bone density and mineral deposition, and it helps with neuromuscular relaxation and nerve signaling [NIH ODS].
Safety profile
Data not available for vitamin D specifically. For calcium, the data shows that high intakes might 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]. The FDA has received a total of 592,059 adverse event reports for all dietary supplements, though specific report counts for this product are not available [FDA data].
Our recommendation
We recommend you use this product as directed on the label. Be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these medications, consult your doctor before adding this supplement. For specific guidance on vitamin D dosing, data not available in this review.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Kirkland Signature |
|---|---|
| Serving Size | |
| Contents | 600.0 Softgel(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