Most, but not all days I have one of
these. I was also taking ZMA (
http://www.bulkpowders.co.uk/zma-capsul ... ?dpc=ZPL10,
https://en.wikipedia.org/wiki/ZMA_(supplement)), but recently stopped mainly because I tidied the bag away somewhere and haven't yet found them. I also take SiS Rego after every session that's at least moderately hard.
It may well be a waste of time, but in the last 12 months I've had 2 minor & short lived colds, whereas normally I'd expect to have 3, 4 or 5 a year, lasting up to a fortnight each. That might be because I'm eating better, or taking more precautions to try and keep colds at bay (which is made difficult living in the same house as a teacher and a 2yo) and have nothing to do with the supplements, difficult to say. As I ramp up training through winter I might need to restart the ZMA if I find I'm struggling with recovery - it definitely felt like it was helping my sleep when I was taking them... although I had some very mad dreams with them too.