i used some pa blackcurrent concentrate at 15% and then added some menthol concentrate no % i just added a few drops then tried it and adjusted till i got what i wanted or you could use some crystals from boots but dont use too much
Add a bit of eucalyptus and sweetener.
INW eucalyptus and Mint is great stuff but strong! So keep your percentages low, maybe 0.5%?
The sweetener gives it the candy like sweetness.