Vitamin World Quercetin Plus Vitamin C

Our assessment

The evidence shows that Vitamin World Quercetin Plus Vitamin C provides two well-studied nutrients, but the specific dosages in this product are not available from the data provided. Quercetin is a plant flavonoid with antioxidant properties, and vitamin C is an essential nutrient for immune function. However, without the exact amounts per serving, we cannot assess whether this product meets the levels used in clinical studies [NIH ODS].

How it works

Think of quercetin as a cellular stabilizer — it helps calm inflammatory responses in your body by acting as an antioxidant. Vitamin C works as a cofactor for immune cells, supporting your body's natural defenses and aiding in collagen production for tissue repair. When combined, these two nutrients may work synergistically to support your immune system during seasonal challenges [NIH ODS] [NIH DSLD].

Safety profile

Data not available for product-specific adverse event reports. General safety data for quercetin and vitamin C indicate they are well-tolerated at typical doses. Vitamin C can cause digestive upset, including diarrhea and stomach cramps, when taken in high amounts (above 2,000 mg daily). Quercetin may interact with certain medications, including blood thinners and some antibiotics. Data on specific report counts for this product are not available [FDA data].

Our recommendation

We recommend checking the supplement facts panel on the bottle for the exact milligram amounts of quercetin and vitamin C per serving. For general immune support, look for a product providing 500–1,000 mg of vitamin C and 500–1,000 mg of quercetin daily. Always talk with your doctor before starting any new supplement, especially if you take prescription medications [NIH ODS] [NIH DSLD].

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