I would be most concerned about overdosing some vitamin or mineral powder, taken in miligram range.
Just one pinch can cause serious and painful injury.
Will it always be mixed evenly?
Just one pinch can cause serious and painful injury.
Will it always be mixed evenly?
"Several individuals experienced in chemistry have already figured out how to make it on their own. I'd like to keep it this way for now, as I trust them to measure the ingredients properly."
Generally though - yes - anything water-soluble is pretty easy to get very controlled concentrations of, since you can dilute until your in the operating range of your weighing machine.
EDIT: Mostly correct! Fat-soluble vitamins build up in the fatty tissues and are much slower to release and are almost always responsible for Vitamin Poisoning, water-soluble vitamins are easily excreted in the obvious way.
There are exceptions though, you can overdose on some of the B vitamins which are water-soluble, I didn't follow up to find out why that is.