Have processed and encapsulated a couple placentas.
Did 2 methods, traditional Chinese (ginger, peppers and other spices part of steaming), with placenta material wrapped up on the membrane.
Also just cut and dried then ground and encapsulated.
The mother saves the capsules in the freezer, for years even.
Can also make a tincture with the dried placenta that is said to be stable for many years.
Whether it's a 'real' help for post-partum depression or not, if it's a strong Placenta-Placebo, with a positive shift for the mum, that's good enough for me.