NOW High Potency Vitamin D-3 2,000 IU
Brand: NOW · Form: SOFTGEL CAPSULE [E0161]
Our assessment
The evidence shows that NOW High Potency Vitamin D-3 2,000 IU is a straightforward vitamin D supplement. The primary ingredient is vitamin D3, and the data supports that vitamin D is critical for bone health through its role in calcium absorption and mineralization [NIH ODS]. For most adults, 2,000 IU is a common maintenance dose, but you should always check your own levels with a healthcare provider before starting any new supplement.
How it works
Think of vitamin D as a master regulator for calcium. It helps your body absorb the calcium you consume from food or supplements, which is essential for bone mineralization and maintaining strong bones [NIH ODS]. This process also supports proper neuromuscular function, helping your muscles relax and your nerves signal effectively [NIH ODS].
Safety profile
Based on FDA adverse event data, there have been 592,059 total reports across all supplements, but specific report counts for this exact product are not available. For the ingredient calcium — which works closely with vitamin D — high intakes can cause side effects including nausea, constipation, weight loss, extreme tiredness, and abnormal heart rhythms [NIH ODS]. The data also notes that high calcium levels may increase the risk of heart disease and prostate cancer [NIH ODS].
Our recommendation
Start by having your vitamin D level tested. If you are deficient, 2,000 IU daily from NOW High Potency Vitamin D-3 is a reasonable starting point under medical guidance. Be aware that calcium supplements can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for specific interactions with vitamin D alone.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 120.0 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