21st Century Maximum Strength Daily Amino Acid
Brand: 21st Century · Form: TABLET [E0155]
Our assessment
The evidence shows that this product contains calcium, a mineral with well-documented benefits for bone health. However, you should be aware of important safety considerations and potential medication interactions before taking it. Data on the specific formulation of this 21st Century product is not available beyond the ingredient list.
How it works
Calcium acts as a structural building block for your skeleton through bone mineralization, supporting bone density and mineral deposition [NIH ODS]. It also plays a critical role in neuromuscular relaxation, helping your muscles relax and your nerves signal properly [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports across all dietary supplements. For calcium specifically, some research suggests that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. High levels of calcium 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]. Calcium can 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 from food sources. If you take this supplement, separate it from any prescription medications by at least 2 hours to avoid absorption issues [NIH ODS]. Consult your doctor before use if you have a history of kidney stones, heart disease, or take any medications. Data not available for the specific amino acid blend in this product, so we cannot comment on its efficacy.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 120.0 Tablet(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