I don't know how a person would measure out 1 mg, I mean I cannot imagine it. One person has the DMSA in grains, so they measure out one "grain". I guess otherwise, you'd just have to keep splitting up a 25 mg capsule until you got to about 3 mg or so. It does sound ludicrous, but some people only require tiny amounts to notice effects and for them it is more than enough to do something.