A typical 3 oz cooked serving of beef heart contains 24.2 grams of protein (28.5 g per 100 g), which makes it a very good source of protein. That covers roughly 48% of the 50 g reference Daily Value, so it can anchor a high-protein meal for the day.
About 69% of the calories in beef heart come from protein, which makes it extremely protein-dense - close to the practical ceiling for a whole food. Foods in this band are the ones that let you raise your protein intake without raising your calorie intake much at all.
Among the 133 meats in the database, beef heart ranks 39th by protein per serving, and 59th out of all 796 foods on the site. Set against duck leg, another meat entry in the database, a serving carries about 0.5 g less protein (duck leg has 24.7 g per 3 oz cooked).
It is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own. The serving above is measured by weight at 85 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Heart is a working muscle, so it eats more like lean steak than like liver.
Source: USDA FoodData Central #169448 - "Beef, variety meats and by-products, heart, cooked, simmered" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Beef heart protein FAQ
How much protein is in beef heart per 100 g?
Beef heart has 28.5 g of protein per 100 g. A typical 3 oz cooked serving (85 g) provides 24.2 g.
Is beef heart a complete protein?
Yes. Beef heart is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own.
How much of the Daily Value does a serving of beef heart cover?
A 3 oz cooked serving of beef heart contains 24.2 g of protein, about 48% of the 50 g reference Daily Value.
Is beef heart a good source of protein?
Beef heart is a very good source of protein, and about 69% of its calories come from protein, which makes it extremely protein-dense. Set against duck leg, another meat entry in the database, a serving carries about 0.5 g less protein (duck leg has 24.7 g per 3 oz cooked).