GHK-Cu Delayed Throbbing Pain After Injection

Throbbing pain the day after GHK-Cu injections, no redness or swelling

Thread summary

Copper peptide solutions skew acidic once reconstituted and GHK-Cu specifically has a reputation for being harder on tissue than something like BPC alone, even at low volumes. (shared by @LabRatLouis)
Worth noting a delayed, deep, non-surface ache without redness is pretty consistent with tissue level irritation rather than infection or a bad reaction, so you're probably not in... (shared by @Dr_Rehab_Ray)
Agree with separating them. (shared by @PharmD_Nadia)
I tracked this exact pattern for six weeks when I was running GHK-Cu for my elbow. (shared by @tendon_tinker)

Top answer from @LabRatLouis. Jump to reply

Been running GHK-Cu mixed with BPC for about two weeks now and I'm doing everything right as far as I can tell. I dilute with extra BAC water, let the vial warm up to room temp before drawing, go slow and deep into the fat in the upper glute (never the stomach, never the muscle). No reaction in the moment. No redness, no bump, no instant sting. I go to bed thinking it went great. Then I wake up the next morning with this deep throbbing ache at the site that lasts two or three days. No surface signs at all, just deep tissue pain. I'm running out of fresh spots to pin because half my backside is still sore from the last round. Is this normal for anyone else or am I doing something wrong?

Collagen is a process, not a purchase.

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LabRatLouis Top answerBoston, MA11 points5d ago

Copper peptide solutions skew acidic once reconstituted and GHK-Cu specifically has a reputation for being harder on tissue than something like BPC alone, even at low volumes. What you're describing sounds like a delayed local inflammatory response, not an allergic one, which is why you get nothing in the first hours and then the complement cascade and local immune response ramp up overnight. Combining it with another peptide in the same syringe can also push the pH further off from what your subq tissue likes. I'd try splitting the two compounds into separate pins at separate sites before assuming it's just GHK-Cu being GHK-Cu.

Preclinical is not a promise.

PharmD_NadiaPhoenix, AZ9 points5d ago

Agree with separating them. Also check your dilution ratio again, if the GHK-Cu is still too concentrated per injection that's going to irritate regardless of depth or temperature. More BAC water, smaller volume per site, rotate further apart than you think you need to.

If the vial looks cloudy, the answer is no.

tendon_tinkerAustin, TX6 points5d ago

I tracked this exact pattern for six weeks when I was running GHK-Cu for my elbow. Delayed soreness peaked around hour 18-24 every single time, never at injection. Diluting further cut the intensity but didn't kill it.

Measure it or it did not happen.

desk_jockey_danaRaleigh, NC8 points5d ago

Sub-q or IM? curious if depth changes this for people

Currently typing with correct posture. Probably.

jumpers_knee_jessOmaha, NE2 points5d ago

Same here. Glutes are the worst for me, way more sore than my stomach ever was.

Isometrics before ice. Every time.

Dr_Rehab_RayCleveland, OH1 points5d ago

Worth noting a delayed, deep, non-surface ache without redness is pretty consistent with tissue level irritation rather than infection or a bad reaction, so you're probably not in dangerous territory. That said if you're running out of rotation sites that fast you're pinning too often into too small an area. Map out a real rotation grid, give each site at least a week before reuse, and don't stack it in the same spot as your BPC.

Load is the drug with the best data.

copper_curiousOPMiami, FL6 points5d ago

Gonna try separating the pins and spacing sites out more, thanks all. Will update if it actually helps.

Collagen is a process, not a purchase.