I've bought some Metatone tonic to perk me up a little!! Say's its for after illness's such as colds and flu or when feeling run down, only thing is it doesn't say how long you have to take it for?? Surely it's not something you can take all the time. The directions on the bottle just say how much and when to take it. Has anyone else tried this? aparently it's meant to taste rank but doctors recommend it so must be good? (I hope)!!!