Taurine is a heat-labile amino acid, meaning it is destroyed when subjected to high temperatures. If you feed kibble (those dry, brown discs), it’s cooked at high temperatures (think 400 °F+). It’s likely the majority of taurine is destroyed. Not cool, I know. What’s worse, there are no taurine requirements in dog food currently because it was assumed dogs could make their own. So, kibble brands aren’t even adding it back in via vitamin packs. If you can’t guarantee your pup is getting enough dietary taurine, a little extra heart support just makes sense.