I would keep the Reta low. Once you get to a certain level it will make you lose too much on a pure bulk. I do love using it low dose with HGH for the metabolic/insulin benefits that it provides. You’ll be able to digest and process food more efficiently, along with creating a better insulin response. It really synergies well with growth or GHRHs. But there is a breaking point mg number that will go from benefit to adverse for bulking.

Def BPC + TB for recovery, inflammation, systemic repair.
Two of my favorite peptides are SS-31 and Mots. Mots will help you use nutrients (especially higher carbs) more efficiently and pushes energy into muscle opposed to fat. SS-31 forces mitochondria to produce more usable energy so you will recovery quicker after workout sessions and muscles grow more efficiently. Lift harder, recover faster, nutrition into muscle, limits fat spillage. Lots of debate on which to do first. I’ve tried both. And my personal favorite is running both at the same time.

Bpc/tb500 for the joint and muscle support are a must. GH is the only other peptide you need. If you were cutting you could add MOTC and Slu in there.

BPC-157 and TB-500 have really helped with healing up for me. I take them as part of a GLOW stack, which I had hoped would help with a lingering shoulder and knee injury + skin health, but I've discovered that I am healing from the aches and pains of hard work outs faster now. It was a welcome, unexpected side effect.

I'd highly suggest running them with a cycle, as they both tend to be ran for about 6-8 weeks each with a break in between, so you may be able to get two cycles in your bulk cycle.

Some are true peptides, others just get lumped into the mix.
Bpc-157 and TB-500 are good for joint and muscle pain.
NAD+ for energy
Glutathione for liver health