esteres are not at all what they are claimed to be. enanthate is supposed to provide stable blood levels with once weekly injections. however, it does not. enanthate DOES release steroids everyday from day one to day 10-12. however it is not a steady release... its something like 25mg on day one, 30 mg day two, 35 mg day three, 20mg day 4, 15 mg day 5... continuing to decline till insignificant amounts around day 11.. so to keep blood levels as stable as possible more frequent injections are desireable.