If one bottle is marked equine use only, don't use it. Simple. No matter what you think is inside it. FFS. If the staff indeed knew of this they deserve to have been sacked for being stupid!
True, although I also look at from a slightly different angle. If one bottle is marked "equine use only", but the active ingredients on all bottles are exactly the same, wouldn't the alarm bells be ringing that maybe you should be stearing clear of the stuff totally, "equine only" labelling or not.
Say you were a doctor/high performance manager at a club and you ordered 2 bottles of suppliments. According to the ingredients, bottle 1 and bottle 2 contain the exact same thing, but one of them (bottle 1) is marked "Equine use only". Do you:
a) Not use bottle 1 because it says "equine use only";
b) Not use bottle 1 because if there is a "dispatch" issue, so who really knows what is in it;
c) Not use either bottle and stop using the suppliments because the suppliers proceedures are stuffed and there is obviously a grey area as to whether the stuff is for for human consumption or not.
d) Say f**k it, the manufacturer says its ok, and I don't care about ethics.