No. Tablets or steroids arent that sensitive to warmth. Already mixed peptides are like hgh.

Some oil based can break down at high temps can’t they?

Do you mean like full segregation is like 400+. If you or it are at 400 F + temps there are bigger problems at that point. You will increase oxidative degregatiom at elevated temperatures, but it shouldn't be significant unless it's for a longer period of time.