Help me decide whether these sentences require the use of a/ an or not

‎should i use an/a here or not? it's a product with (an/..) international quality you shouldn't buy (an/..) oil with any of the following people view (an/..) oil being refined as a selling point. Canula oil is (a/an) RBD oil Also can we say useful ingredients instead of healthy ingredients or does that convey different meaning?

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