根据美国国家老化研究所（National Institute on Aging），2.4克鱼油约是美国人通过食物摄取平均量的15到20倍。世界卫生组织（WHO）建议每天剂量不应超过3克，因为摄入过多可导致出血和低血压，甚至会与药物或维他命A、D和E起反应。
A Danish study of 695 pregnant women is raising the possibility that fish oil supplements begun in the final three months of pregnancy may reduce the risk of asthma or persistent wheezing in offspring.
The supplements brought the risk from 23.7 percent among mothers in the placebo group who took 2.4 grams of olive oil daily down to 16.9 percent in the women who got the fish oil capsules. That's a 30.7 percent reduction during the first three years of life.
The real benefit seemed to be exclusively among the children whose mothers started out with low levels of the two key ingredients in fish oil - eicosapentaenoic acid （EPA） and docosahexaenoic acid （DHA）。 That may make them more vulnerable to the inflammation and heightened immune system response that is a factor in asthma and related conditions.