21st Century B Complex plus Vitamin C
Brand: 21st Century · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that this product provides a combination of B vitamins and vitamin C, but the critical data available on its ingredients relates to calcium, which is not listed in the ingredients. Based on the data provided, we cannot confirm the specific benefits or risks of this exact formulation. For a general audience, B vitamins support energy metabolism, and vitamin C supports immune function, but you should always check the label for the exact amounts of each nutrient. Data not available for the specific benefits of this blend.
How it works
Think of calcium as a structural building block for your bones and a regulator for your nerves and muscles. It supports bone density and mineral deposition, and it helps with muscle relaxation and nerve signaling [NIH ODS]. While calcium is not listed in the product ingredients, this mechanism illustrates how minerals in supplements function in the body.
Safety profile
The FDA has received a total of 592,059 adverse event reports across all dietary supplements, but specific report counts for this product are not available. For calcium specifically, 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]. Because this product does not list calcium, those side effects may not apply. Side effects for B complex and vitamin C are not provided in the data.
Our recommendation
Start by reading the product label to confirm the exact amounts of B vitamins and vitamin C. For calcium, the data shows it can reduce absorption of medications like bisphosphonates, tetracycline and fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these medications, consult your doctor before starting any new supplement. Since specific study data for this product is not available, rely on your healthcare provider for personalized advice. Our recommendation: verify the label, check for drug interactions, and discuss with your pharmacist or doctor.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 100.0 Tablet(s) |
| Market Status | On 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