Check for the "use-by" date on the packaging of Tarragon Natural Flavour.
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NutriBuddy™ 
Description
Tarragon is a species of perennial herb that grows 4-5ft tall and belongs to the sunflower family. It has glossy green, 2–8 cm long and 2–10 mm broad leaves. Tarragon Natural Flavour is a concentrate extracted from leaves of tarragon. It is in the form of clear, colorless liquid or powder that has all components derived from natural sources. It can be used as a flavour enhancer.