Here is why I would avoid beef proteins, and probably why a lot of companies do not produce them.
We all like to romanticize with the idea that beef protein is filet mignon grinded into powder, but it is simply not. The price of beef is exuberant, making
pescience.com
most of beef protein powders contain mainly collagen and gelatin, thus they have a PDCAAS of zero.
Collagen and gelatin-loaded products are not beneficial for athletes and are not a significant source of protein.
Another massive difference is the amount of glycine in beef protein (beef protein isolate contains 20.1 grams of glycine, more than 14 times the amount of glycine in whey protein). Glycine is a filler amino acid added into products to cheapen the cost of the product
The whey product has much more of the essential amino acids and BCAAs (34.96 grams in whey vs. 19.4 grams in beef protein isolate per 100 g). The number of essential amino acids and BCAAs are what we really want to consider when we look at different sources of protein as athletes when it comes to determining what is best for our lifestyles
Collagen is not a complete protein source and is high in glycine, proline, arginine, and hydroxyproline. All these labels are just fancy words for what beef protein really is: collagen, gelatin, and leftover scraps.