One of the most common side effects of fish oil soft capsules is weight gain. People who diet to lose weight and control calorie intake should know that fish oil soft capsule supplements are not calorie-free, and if calories are not reduced, they may also gain weight. Studies have shown that fish oil soft capsules may also lead to the increase of low density lipoprotein cholesterol level as high as 10%, which should be closely monitored.

Another common side effect is digestive system disorder. After taking fish oil soft capsules, many people will have slight nausea and flatulence. Exacerbation of flatulence and "fishy smell" in the mouth are also common phenomena for users of fish oil soft capsules. Sometimes, these symptoms are due to the deterioration of fish oil, so products that exceed the shelf life must not be used. Taking it with meals is also a way to reduce the unpleasant fishy smell. Once the body is adjusted, these minor but common side effects caused by taking fish oil soft capsules will be reduced.

Finally, because high-fat fish often contains mercury and PCB substances, many people are worried that fish oil soft capsule supplements will be contaminated. Studies have shown that fish oil soft capsules are indeed safer than eating fish directly. When testing fish oil soft capsules from many manufacturers, the contents of most mercury and PCB substances are still very low. Most well-known fish oil soft capsule manufacturers remove harmful pollutants by high vacuum distillation, which is a very effective process. It is also feasible to make pollution-free pharmaceutical-grade fish oil soft capsules.

Generally speaking, the side effects of taking fish oil soft capsules are still very small. However, especially those who take blood-thinning drugs, they must follow the doctor's advice and suggest that they must go to large formal businesses to buy fish oil.