GNC Pro Performance Essential Amino Complete Blueberry Acai

Our assessment

The evidence shows that GNC Pro Performance Essential Amino Complete Blueberry Acai contains calcium as a key ingredient. Our assessment is that this product is primarily marketed for workout recovery, but the specific data available only covers the calcium component. For general health, calcium supports bone density and muscle function, but you should be aware of important safety considerations before taking this supplement [NIH ODS].

How it works

Think of calcium as a structural and signaling mineral. It works through bone mineralization, helping to deposit minerals into your skeleton to support bone density. It also plays a role in neuromuscular relaxation, meaning it helps your muscles relax and your nerves signal properly after exercise [NIH ODS].

Safety profile

FDA received 592,059 total adverse event reports across all 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 also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Start by checking if you need additional calcium, as many people get enough from diet alone. If you take this product, be mindful of your total daily calcium intake from all sources. Take calcium supplements separately from medications like thyroid hormone or antibiotics by at least 2 hours to avoid absorption issues [NIH ODS]. We recommend consulting your healthcare provider before starting, especially if you have kidney concerns or take prescription medications. Data on the amino acid blend specifically is not available.

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