Excellent brandable for a protein-related food business.
The name "proteyn" has seven letters and only two syllables. Two-syllable names are highly rare and very valuable. Established brands using two syllable names include Honda, Subway and FedEx.
Proteyn.com is a dot-com domain. Dot com domains are the most desirable top-level-domain in the world, used by famous websites like youtube.com. Owning a dot-com says that you own the word "proteyn" online.