Which is grammatically correct?
A visit was made to local supermarket to observe and collect information for/on/about the fat contents of vegetable spread and butter available in the store.
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A visit was made to local supermarket to observe and collect information for/on/about the fat contents of vegetable spread and butter available in the store.
According to Oxford's dictionary, both "information on" and "information about" can be used.
I would also use an indefinite article in your exemplary sentence: "a local supermarket".