Master Tonic is a year old - still good?

[amcal]

We have a confirmed case of influenza in the house so, I'm preparing....

I made a batch of master tonic last year.  Do you think it's still good?  Or should I make a fresh one?

[velcromom]

 I made some last year too, and although the color has dulled, it is exactly the same as it was when I put it into the pantry. In fact, much stronger!! I personally would feel comfortable using it, if I could get it down, that is...