It shouldn't have any impact on the effectiveness of ephedrine, no. In my experience, ephedrine is effective no matter what. Even if I take it close to a meal, I still feel the effects and notice benefits from it
May raise insulin but not a whole lot from some BCAAs
In no way do they "compete" for anything, but they are not synergistic either. Insulin will work against the effects but not enough to come near negating them. I wouldn't worry.
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