An occlusive compound for injection into and occlusion of a body vessel, the occlusive compound comprising: a polymer comprising 5 percent to 25 percent of the occlusive compound weight-to-volume, a protein comprising a sulfur-bearing amino acid comprising 1 percent to 50 percent of the occlusive compound weight-to-volume, and a sclerosant, the occlusive compound being substantially fluid at a first temperature and substantially non-fluid at a second temperature, the first temperature being lower than the second temperature; wherein: the polymer is a nonionic polymer comprising a first chain having a first end and a second end, a second chain having a first end and a second end, and a third chain having a first end and a second end, the second end of the first chain being bound to the first end of the second chain, the second end of the second chain being bound to the first end of the third chain; the first chain and the third chain comprising poly(ethylene oxide) and together comprising about seventy percent of a molecular mass of the polymer; the second chain comprising poly(propylene oxide) and having a molecular mass of about 4000; the protein comprises an albumin; the polymer and the protein are mixed and crosslinked; and the sclerosant comprises sodium tetradecyl sulfate or polidocanol. a polymer comprising 5 percent to 25 percent of the occlusive compound weight-to-volume, a protein comprising a sulfur-bearing amino acid comprising 1 percent to 50 percent of the occlusive compound weight-to-volume, and a sclerosant, the occlusive compound being substantially fluid at a first temperature and substantially non-fluid at a second temperature, the first temperature being lower than the second temperature; wherein: the polymer is a nonionic polymer comprising a first chain having a first end and a second end, a second chain having a first end and a second end, and a third chain having a first end and a second end, the second end of the first chain being bound to the first end of the second chain, the second end of the second chain being bound to the first end of the third chain; the first chain and the third chain comprising poly(ethylene oxide) and together comprising about seventy percent of a molecular mass of the polymer; the second chain comprising poly(propylene oxide) and having a molecular mass of about 4000; the protein comprises an albumin; the polymer and the protein are mixed and crosslinked; and the sclerosant comprises sodium tetradecyl sulfate or polidocanol. the polymer is a nonionic polymer comprising a first chain having a first end and a second end, a second chain having a first end and a second end, and a third chain having a first end and a second end, the second end of the first chain being bound to the first end of the second chain, the second end of the second chain being bound to the first end of the third chain; the first chain and the third chain comprising poly(ethylene oxide) and together comprising about seventy percent of a molecular mass of the polymer; the second chain comprising poly(propylene oxide) and having a molecular mass of about 4000; the protein comprises an albumin; the polymer and the protein are mixed and crosslinked; and the sclerosant comprises sodium tetradecyl sulfate or polidocanol.