PROBLEM TO BE SOLVED: To develop a means for hemostasis promotion that is safe, easy, inexpensive and free from the risk of the generation of inhibitor, and further routinely performable by a human or an animal owner.SOLUTION: A hemostasis promoter and a platelet aggregation promoter include fucoidan as an active ingredient. The fucoidan is derived from Nemacystus decipiens.COPYRIGHT: (C)2014,JPO&INPIT【課題】安全、簡便、安価、かつインヒビターの発生の心配がなく、しかも人、あるいは動物の飼い主が日常的に行うことのできる、止血促進のための手段を開発する。【解決手段】フコイダンを有効成分として含む止血促進剤、血小板凝集促進剤。【選択図】なし