Organizations that provide reliable information regarding protein content and other nutritional facts about food include the Academy of Nutrition and Dietetics, ChooseMyPlate.gov, Nutrition.gov, and the National Heart, Lung and Blood Institute, according to Vanderbilt University. Government websites often provide the most up-to-date and reliable health and nutrition information.
Nutrition.gov lets users look up the nutrient content of specific foods in the National Nutrient Database for Standard Reference. It also provides reliable information about dietary supplements, weight loss, meal planning and nutrition issues.
Websites with .gov and .edu extensions tend to provide the most unbiased and reliable information regarding nutrition, including protein content. While commercial websites with a .com extension may provide useful information, they may be biased toward selling products.