Can I stack multiple peps in the same tube?

For research purposes only: I’m taking Reta (1x per wk) & GHKCU (daily 6 on 2 off) currently. I was taking NAD(daily) but almost out. I’m looking to add glutathione and KPV as well as continue the other 3. On the days where I would take Reta, GHKCU, Glutathione, KPV and NAD am I to pin myself 5 times? Or can I draw back multiple substances in the same needle?