into [美 ˈɪntu, ˈɪn(t)ə, 英 ˈɪntʊ, ˈɪntə]介词into often appears as the second element of certain verb structures in English (break into, look into, settle into, etc). For translations, see the relevant verb entry (break, look, settle, etc). into is used in the structure verb + sb + into + -ING (to coax sb into doing, to provoke sb into doing, etc). For translations of these structures see the appropriate verb (coax, provoke, etc).
On the contrary, intravenous glutathione delivers very high doses directly into the systemic circulation and is the preferred mode of administering glutathione.