NOW Sports Branched-Chain Amino Acids

Our assessment

The evidence shows that this product contains calcium, which is a mineral essential for bone health [NIH ODS]. However, based on the data provided, we cannot verify the specific health benefits of the "NOW Sports Branched-Chain Amino Acids" product itself, as the ingredient data available is for calcium, not branched-chain amino acids. For general calcium supplementation, the data supports its role in bone mineralization and neuromuscular function [NIH ODS].

How it works

Think of calcium as a structural builder and a signal messenger — it supports bone density and mineral deposition, and it helps your muscles relax and nerves send signals properly [NIH ODS]. These mechanisms are critical for daily movement and overall skeletal strength.

Safety profile

The FDA received 592,059 total adverse event reports across all supplement categories. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer [NIH ODS]. Side effects from very high blood or urine levels include 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 absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Because the data provided is for calcium — not branched-chain amino acids — we cannot make a specific recommendation for this product. If you are seeking a calcium supplement, be mindful of total intake from food and other supplements to avoid exceeding safe levels [NIH ODS]. Always consult your healthcare provider before starting any new supplement, especially if you take prescription medications [NIH ODS].

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