GNC Pro Performance Ultra Amino Complex Watermelon

Our assessment

The evidence shows that this product contains calcium, but we have no data on the specific amount per serving from the provided label. Calcium is a well-researched mineral, but without knowing the exact dosage in this supplement, we cannot determine if it provides a meaningful benefit for you. The primary role of calcium is supporting bone mineralization and neuromuscular relaxation [NIH ODS].

How it works

Think of calcium as a building block for your bones and a signal messenger for your muscles and nerves. It supports bone density and mineral deposition, which is critical for skeletal strength. It also plays a key role in neuromuscular relaxation, helping your muscles relax and your nerves send signals properly after contraction [NIH ODS].

Safety profile

Data not available for specific side effects tied to this product. However, the FDA has received a total of 592,059 adverse event reports across all supplements. For calcium specifically, the data notes that high intakes might increase the risk of heart disease and prostate cancer. Very high levels in the blood can cause poor muscle tone, poor kidney function, constipation, nausea, weight loss, extreme tiredness, frequent urination, and abnormal heart rhythms [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Because the exact calcium content per serving is not provided in the data, we cannot recommend this product for calcium supplementation. If you are taking medications like thyroid hormone or certain antibiotics, be cautious, as calcium can interfere with their absorption [NIH ODS]. For a reliable calcium supplement, we recommend choosing a product with a clearly labeled dosage and consulting your healthcare provider about your specific needs.

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