New to peptides — stopping Mounjaro for retatrutide, or stacking both?

[Lilou]

Hello everyone, I'm new to peptides. I'm 42, 1.68 m tall and weigh 74 kg (I want to put on 15 kg). Right now I'm on Mounjaro 2.5 mg and I've just bought retatrutide and GHK-Cu. I'd like to start injecting both of these peptides, but I have a few questions:

• Should I stop Mounjaro in order to switch to retatrutide?
  
• If yes, what dosage would you suggest?
  
• Should I combine Mounjaro and retatrutide? If yes, what dosage for each?
  
• What dosage of GHK-Cu would you suggest?
  
• I plan to buy other peptides soon; which ones would you recommend for weight loss, collagen, muscle definition and metabolic changes?

Thanks!