““Chlorophyll will only make oxygen in the presence of light. It’s dark in your intestines, and even if you stuck a searchlight up your bum to prove a point, you probably wouldn’t absorb much oxygen in there, because you don’t have gills in your gut. In fact, neither do fish.””
– Dr Ben Goldacre on BadScience.net
"Chlorophyll will only make oxygen in the presence of light. It’s dark in your intestines, and even…"