One aspect of the present disclosure is a stabilizer composition for stabilizing a liquid composition containing a collagen peptide having a tripeptide composed of Gly-Pro-Hyp, and a food having the same, and in stabilizer composition for stabilizing a liquid composition containing a collagen peptide according to one aspect of the present disclosure, the stabilizer composition contains glucono-delta-lactone as an active ingredient, a pH is 3.0 to 4.0, the GPH, an indicator ingredient of the collagen peptide, is stabilized, and there is an excellent effect of being able to easily manufacture and distribute as a food with a longer shelf life and a very high preference for the decrease in GPH content as the storage period is prolonged.