Absorption in the Stomach. The stomach absorbs very few substances, although small amounts of certain lipid-soluble compounds can be taken up, including aspirin, other non-steroidal anti-infammatory drugs, and ethanol.lossary. The stomach absorbs very few substances, although small amounts of certain lipid-soluble compounds can be taken up, including aspirin, other non-steroidal anti-infammatory drugs, and ethanol.