EPO you can get in most health food shops - like holland and Barrett, most chemists do them, but with vitamins etc, as do supermarkets
RLT I've only found in holland an barret.
EPO can help to ripen the cervix, may encourage labour to start, and lower risk of tearing.
RLT can help to strengthen uterine muscles making contractions more effective possibly leading to a shorter labour (an average of 10mins shorter!)
Neither is to bring on labour!!