Check for the 'best before' date on the packaging.
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Rosemary extract is the extract of rosemary plant which is basically an oil.Basically, rosemary extracts which can be confirmed as natural rosemary flavourings to those rosemary natural flavours which are not deodorized and their content of reference antioxidant compounds is lower than 15 times their content in key volatiles.Rosemary extracts are actually flavourful and impart rosemary aroma to dishes.