dispensable

adjective

1. Able to be done without; able to be expended; easily replaced.
2. Capable of being dispensed; distributable.
3. (of a law, rule, vow, etc.) Subject to dispensation; possible to relax, exempt from, or annul.
4. (nutrition, of an amino acid) Not essential to be taken in as part of an organism's diet, as it can be synthesized de novo.