biogenic

1. Produced by living organisms or biological processes.
2. Necessary for the maintenance of life processes.

Having the property of originating in a biological process.

• b. amine — an amine neurotransmitter, such as epinephrine, norepinephrine, serotonin or dopamine.
• endogenous b. amines — occur naturally in the body, e.g. epinephrine, norepinephrine.

The adjective has 2 meanings:

Meaning #1: produced by living organisms or biological processes
  Pertains to noun: biology (meaning #2)

Meaning #2: essential for maintaining the fundamental life processes