Allergic reactions have been reported in some people. These rinclude severe breathing problems and a life-threatening allergic reaction called anaphylaxis.
There isn't enough research to know if chlorella is safe for women who are pregnant or breastfeeding. It may make it harder for warfarin and other blood-thinning drugs to work.
Some chlorella supplements may contain iodine, so people with thyroid conditions may want to avoid them.
- Bloating
- Diarrhea
- Fatigue
- Gas
- Green-colored stools
- Nausea
- Stomach cramps