How many chemicals are present in the human brain?

There are thousands of different chemicals found in the human brain, including various neurotransmitters, hormones, and other molecules that play essential roles in brain function and communication. The exact number is not precisely known, but estimates suggest that there may be several hundred to a few thousand different chemical compounds present in the brain. These chemicals contribute to regulating functions such as thought, emotions, memory, movement, and sensory processing, among others.