I think sterility of the end result/pill is not so important (the stomach is not a sterile/aseptic environment) but the sterilisation of equipment used in order to avoid cross contamination. Even if the encapsulator will not do placentas with HIV, hepatitis etc, there's still no guarantee that without proper sterilising equipment you are not ingesting particles of other women's placentas. Even if you were happy to eat your own, I think a lot of women might draw the line at eating other people's? I dunno, entirely up to the women making the choice obviously, but that would be my concern.
Second shout out for @SheWarrior....would be a really interesting perspective to get.