I would like to comment on the solids levels in the kitsnmore vials. I worked in the chemical industry where we dealt with a lot of slurries, and I have seen many sample bottles in my office. I know that some slurries can settle in a matter of hours, and others take weeks. Sometimes you can look at a bottle that looks to be completely settled with a clear layer on top, but day by day the bottom solid layer becomes smaller as it compacts.
For the liquid C I know the initial settling occurs rapidly, but the solids seem to have a little bit of electrostatic repulsion to them, so packing of the solid phase occurs very slowly. I am not that interested in it to measure it day by day, but it is an option for anyone who is curious.
The vials from kits might vary a little bit, but a large variation like is shown in the photo may just be related to the time since agitation. It would not be that hard to have a pretty tight control on the variation in the vials, and it is somewhat important, as you wouldn’t want to give someone 60mg when they thought they were taking 15mg. I bet Kits has at least a fair control on the concentrations.