I only mix items that are already formulated to go together. I also prefer not to inject more than one thing per day when possible.
I combined two items in one syringe and the mix turned into a gel that would not push through the needle. Both doses were wasted. Some stacks are known to work together, but which other ones are okay? Multiple injections do not bother me much, yet fewer would be better. Two other compounds mixed without issue, yet I wonder if a reaction still occurred and whether both will remain effective. Could a third one join that mix? One morning shot and one evening shot would be ideal. Share any successes or failures you have seen.