Leibovitz's L-15 Medium supports the growth of HEP-2 monkey kidney cells and primary explants of embryonic and adult human tissue. L-15 is buffered by phosphates and free base amino acids instead of sodium bicarbonate. This medium is designed for supporting cell growth in environments without CO₂ equilibration.

The complete formulation is available.

Using L-15
L-15 contains no proteins, lipids, or growth factors. Therefore, L-15 requires supplementation, commonly with 10% Fetal Bovine Serum (FBS).