A selective hydrogen adding equipment is provided by which living organism applicable hydrogen-contained fluid is obtained without changing properties of the living organism applicable fluid. Living organism applicable hydrogen-contained fluid is obtained through storing a hydrogen generating system, which contains a hydrogen generating agent as an essential component, in a hydrogen bubble forming implement which has a gas/liquid separating section including a gas-permeable film or an open-close type valve, causing the hydrogen generating system and a generating-purpose water to react in the hydrogen bubble forming implement, and supplying hydrogen gas generated in the hydrogen bubble forming implement into living organism applicable fluid via the gas/liquid separating section.本發明係提供能在不改變生物體適用液特性之情況下，獲得含氫生物體適用液的選擇的氫添加器具。將以氫產生劑為必要成分的氫產生系統，收容於具備含有透氣膜或開閉式閥之氣液隔離部的氫氣泡形成體中，在該氫氣泡形成體內，使上述氫產生系統與產生用水進行反應，而將該氫氣泡形成體內所生成的氫氣，經由上述氣液隔離部送入於生物體適用液中，而獲得含氫生物體適用液。
