What's the plural form of flaxseed oil? Here's the word you're looking for.
Answer
The noun flaxseed oil can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be flaxseed oil.
However, in more specific contexts, the plural form can also be flaxseed oils e.g. in reference to various types of flaxseed oils
or a collection of flaxseed oils.