From clinical point of view, sheep placenta has proven to be effective for cosmetic purposes. As for so many brand of sheep placentas, celllabs sheep placenta, to be exact 'celllabs sheep placenta FORTE' by far contained highest amount of placenta extract in one capsule which is 30,000mg of 'PLACENTA FRESH', one may think 30,000mg is tremendous amount, but in fact the active ingredient (placenta extract) is only 600mg. yet, if compare with infamous 'Zell V', cellabs led alot more ahead. This is not all, grape seed oil had been mentioned above, but cellabs come with squalene, which is super expensive type of cuisine on the table, this may link to why this product is so expensive.
to answer question from the top:1. pregnant lady are not adviseble to consume any of this, becoz no clinical data has shown sheep placanta will bring any benefit to feotus, and we also don know wat will happen to feotus if any pregnant lady consume it.
2. Rashes: rashes is common to those who consume sheep placenta, especially those highly concentrated one, becoz detoxification process is goin on. But if rashes persisted for 1 week or more on regular intake may indicate incompatiiblity