Not sure what you mean by extra ingredients, but 5-AT, one of the ingredients in Core Hard was banned by the INBF/WNBF. The ban makes no sense, because the ingredient is a metabolite of DHEA...7 Keto is also a metabolite of DHEA and it's legal to use in the INBF/WNBF. Anyway, there will be a reformulated version of Core Hard that does not have 5 AT:
Invalid Link Removed
For those who aren't affected by the ban (it's not banned in the OCB/IFPA) they can stack the new reformulated version with 5 At for the ultimate cortisol suppressant.
As a cortisol suppressant, it would be effective by itself or stacked with anything else. I stacked it with Core Alpha and got tremendous results. I would recommend running the two together for 8 weeks and then taking at least 4 weeks off. As far as your question about non natural cycles, I have no experience using any type of banned susbtance (steroids or pro-hormones) as i'm a lifetime natural, but as I said before a cortisol suppressant is beneficial under any circumstances. Hope this answers your question.
Kurt