What is carnosine and why its supplementation is recommended to vegetarians and vegans?

One study’s result shown strict vegetarians have 50% or less carnosine in muscle tissue then omnivores. Carnosine is present at particularly high concentrations in muscle, heart, and brain. Carnosine has been excessively researched for its anti-aging properties. In sports nutrition, carnosine is known for its ability to buffer pH in a working muscle.