What's the difference between Brandt's chicken essence and Brandt's bird's nest?

Brandt's chicken essence is used to improve metabolism and supplement physical strength and brain power. There are many kinds of products, including angelica chicken essence, cordyceps chicken essence and Chinese herbal medicines, which are suitable for people with different needs. His chicken essence is specially prepared for candidates. I drank it for 3 months in the college entrance examination, and the effect was not bad. Bird's nest is very nutritious. Women can drink it, which can beautify and moisturize. If it is a gift, I will choose chicken essence. His chicken essence is easy to use and has been reported by Discovery, hehe ~