It is sensible to incorporate fatty fish into your diet if you can. However, you would have to eat an awful lot of it to get the equivalent dosages delivered by the supplement. Unfortunately, as you may be aware, the FSA (Food Standards Agency) has recently had to warn women who are pregnant, or who are trying to get pregnant, to restrict their consumption of fresh tuna (the most popular of the oily fishes in the modern diet) due to concerns over the high levels of mercury found in some tuna fished from contaminated waters. VitalDHA does not contain any tuna but is produced from mixed, deep-sea, oily fish (using a process which removes any possible pollutants) and is biochemically screened for extra safety too.