Small amounts of foam are normal and will dissipate within a few minutes if you let the vial sit undisturbed
Briefly, sodium bicarbonate, glucose, sodium pyruvate, and all 20 amino acids (except cystine and serine), biotin (B4639, Sigma), and vitamin B12 (V6629, Sigma) were added to the DMEM medium (#D9800-28, USBiological, Salem, MA) to match standard IMDM, supplement with 15% human AB serum and 15% dialyzed FBS (#SH300790340, Cytiva Hyclone), along with 10 ng/mL interleukin-3, 50 ng/mL stem cell factor and 2IU/mL erythropoietin
It was developed in the 1990s by researchers at Monash University in Melbourne, Australia, with one goal: isolate the fat-burning portion of growth hormone and deliver those effects without the risks that come with full hGH administration
Clin Rev Allergy Immunol 31(2-3):119-30