Look for the expiry date of natural lychee flavour. Make sure it has no added sugar and artificial flavours.
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NutriBuddy™ 
Description
Natural Lychee flavour is a clear colourless to pale brown coloured liquid extracted from lychee fruit. It is made with Propylene glycol (1520) as a base. It has a distinct Lychee flavour and aroma when added to food and drinks.