The most common side effect of taking fish oil supplements is the aftertaste. However, if the bottle has a pungent odor when you open it, there is a good chance that the capsules may have rotted. Do not use fish oil supplements past their expiration date and always remember to store them in a cool, dry place.
Some people experience vomiting, diarrhea and nausea that may have been caused by these supplements. In most cases, this situation can be avoided by taking the fish oil capsules with your meal. However, sometimes people experience digestive discomfort, such as diarrhea and vomiting, because the supplement may have gone rancid. This is why it is critical to check the expiration date on the bottle before buying and consuming.
While you are on supplements, you may sometimes feel bloated or gassy. According to health researchers, it still remains undetermined why that happens, but you must notify your doctor immediately if you are belching frequently.