[1] The element lithium was first produced during the Big Bang that created the observable universe.
[2] Those models that fail to satisfy these constraints are therefore subject to rejection or correction by the scientific community.
Lithium is readily consumed by fusion with protons at temperatures above 2×106 K, such as is found in the cores of stars.
Likewise, lithium can be produced in interstellar matter by spallation collisions with cosmic rays, or by the evolution of stars of moderate mass.
Such stars were formed early in the universe out of material that had not been significantly modified by other processes.