One thing to note, do not mix HGH with anything else. Let that one fly solo.

I do this often, I also will drawn up water based gear like test suspension with an oil based product due to ease of injection, no clogging and it cuts down on pip pain from the suspension.
It's ideal if you are doing 2 or 3 enanthate products, if it's all the same ester makes it easy but a little juggling maybe involved if doing quick and long gear.
So yeah go ahead, it makes the whole process easier and less body parts to hit.

I’ve never had a problem. Like someone mentioned I don’t use water based in the same syringe as oil but otherwise I’ve mixed them all, from different manufacturers. Etc.
I’ve mixed, test e, tren a, npp, eq, test prop, mast, primo. Not all at once but they’ve all been mixed together in one way or another over the last 6 years.

The Only ones that are rumoured not to go well together are Test Prop, NPP and DBol injectable. There is some kind of chemical reaction that goes on between a 19nor and Guaiacol whereby you have a 50% chance of growing a second penis in between your ball sack and anus. This has yet to be scientifically proven but there is rumour of a few members on here having experienced this genital change - whether you see it as a positive biological change is down to personal preferences.

I'm currently mixing mast p, test c and primo all in same syringe ed injection with zero issues. Prior to this cycle i was a dumb fuck and loading three different syringes and doing them separately. Like they said I do run it under a little warm water and inject slow.

I see your trying to be precise and do things right.
.... this is overkill tho.
This is like being in the gym trying to figure out what exercise to do for half hour wasting time, instead of just going on a bench or picking up some dumbbell doing pull ups squat something.

I've had no issue at all mixing my EQ and test. Both from different manufacturers but they appear almost the exact same color and consistency.

Never had a problem mixing oils. 3cc, 4cc… 5cc was my max in one go. Still alive, still semi-pretty.
My rule: oil with oil, water with water … don’t be a psycho.
But yea, I’ve seen dudes mix oil, water, peptides, and regrets all in one barrel. Not me, bro.

Mixing gear in the same barrel isn’t about chemistry class, it’s about surviving the next 48 hours without feeling like you injected lava into your quad.

Here’s the deal, most oil-based AAS play nice together in the same syringe if they’re in the same carrier oil (GSO, MCT, EO, etc.). But that’s the key, carrier oil compatibility is the make-or-break here, not the compounds themselves.

Your Stack Breakdown:
Test C -- standard AF, GSO/MCT most common, smooth

EQ -- thick as fuck, like pinning maple syrup. Known to crash if mixed with thinner oils

Primo -- pip-prone diva, especially UGL stuff brewed high (200mg/ml+). Needs heat or dilution

Mast -- usually smooth, but some UGLs brew it with bite

So can you mix all four in one barrel, Technically, yeah.

EQ + Primo together = pip roulette. One’s thick, one’s crash-prone. That combo can turn your glute into a crime scene

If you're mixin' high mg/ml doses (like Primo 200 or EQ 300), use a little Test C or Mast as a “cushion oil” to cut the sting

Always draw slow, mix warm (body temp vial works wonders), and pin deep IM with a 25g or larger

Also, DO NOT mix oil-based with water-based shit (HCG, B12, etc.) in the same syringe. That’s how you get sterile abscesses and start googling.....Why does my leg feel like it’s gonna explode

Yes, you can mix those oils if carrier oils are compatible
Primo and EQ are the pip bullies, watch concentration and brew quality
Warm the gear, pin slow, rotate sites like a pro
Never mix oil and water-based compounds in the same shot, unless you enjoy ER visits

You ain’t blending a smoothie, you’re building a cycle. Keep it clean, precise, and smart.

Ive always mixed. Oil with oil and water with water of course

I know people who do this and they swear by it. Ive never mixed and have always pinned multiple times if running more than 1 compound at a time.