What is Chicken Essence? Chicken essence is chicken broth a step further. It has gone through a complex process involving vacuum concentration, centrifugation, extraction using high temperatures, and sterilisation
https://www.allthingshealth.com/en-my/welln...20sterilisation.

Effects of chicken essence on recovery from mental fatigue in healthy males

results

After essence of chicken intake for 1 and 4 weeks, the reaction times on the cognitive task trials after the rest session were significantly shorter than those at baseline, and significant changes were not observed with placebo intake. The reaction times before and after the fatigue-inducing session were not altered by either essence of chicken or placebo intake.
Conclusions

We showed that daily intake of essence of chicken could be effective for the recovery from mental fatigue and is a promising candidate for use as an anti-fatigue food.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3707410/