Do the fish oil supplements that you see on the store shelves contain natural omega3? This depends on how you interpret that term.
Some manufacturers use it to describe a product which has been changed from its natural state.
It comes down to the molecular structure of the omega3 and how it changes during processing.
The aim is to give you more of the effective ingredient of the product but the result be may be exactly the opposite.
When fish oil is first extracted from the flesh of the fish, it is obviously in a natural state.
Some supplements contain fish oil in this state, which may not be very high in omega3.
The omega3 at this stage is in the form of a triglyceride.
Many fish oil supplements are concentrated in ore to provide a higher dose of omega3.
You would otherwise have to use a large dose of the product to get what you need.
The process of concentration changes the triglyceride into an ethyl esther.
This is still a natural form of the product.
Some companies put the product through a further stage of processing which turns it back into a triglyceride.
They then claim that this is a natural product when in fact it isn't.
This new form of omega3 has a different molecular structure which makes it harder for the body to use.
If you insist on a natural omega3 product, which you should, you need one that has not been changed into this synthetic triglyceride form.
Not all companies will tell you this on their labelling or their websites.