An object is to provide a dispersion containing a lipid peptide type compound useful as a low molecular weight gelator, such as a lipid dipeptide and a lipid tripeptide, and a dissolution accelerator capable of dissolving the lipid peptide type compound at a lower temperature and more easily. It is also an object to provide a dispersion that can form a hydrogel by a simpler method and under a milder condition (low temperature) and from which a gel can be obtained as a gel having high thermal stability, and provide a method for forming the gel. A dispersion comprising : a lipid peptide type compound in which a peptide portion formed by repetition of at least two or more identical or different amino acids is bonded to a lipid portion including a C 10-24 aliphatic group; a dissolution accelerator having, in molecules thereof, a hydrophilic portion and a hydrophobic portion, the hydrophilic portion having a betaine structure; and water; and a method for producing a hydrogel by use of the dispersion.